WO2017162176A1 - Storage system, access method for storage system, and access device for storage system - Google Patents

Abstract

A storage system, an access control method for a storage system, and an access control device for a storage system, which solve the problems of an existing storage system not being able to handle a single-point fault of a storage node, low fault tolerance processing efficiency, and low utilization of a storage medium. The storage system comprises: an SAS storage network, comprising at least one SAS exchanger; at least two storage nodes, connected to the SAS storage network; and at least one storage device, each storage device comprising at least one storage medium, each storage medium directly connected to the SAS storage network by means of a built-in interface; the SAS storage network being configured to enable each storage node to directly access all storage media without the assistance of other storage nodes.

Description

Storage system, access method of storage system, and access device of storage system Technical field

The present invention relates to the field of data storage technologies, and in particular, to a storage system, an access control method for a storage system, and an access control device for the storage system.

Background technique

With the increasing scale of computer applications and the increasing demand for storage space, building high-availability and high-performance storage systems has become a research and development hotspot in the field of data storage. Multi-path storage technology can guarantee storage systems. It is widely used for its usability. Based on the multi-path storage technology, when one access path in the storage system fails, the server can continuously access the storage device through another access path.

FIG. 1 is a schematic structural diagram of a conventional multi-path storage system provided by the prior art. As shown in FIG. 1, the conventional multi-path storage system is composed of a server, a plurality of switches, a plurality of storage device controllers, and a storage device, wherein the storage device is composed of at least one storage medium. Different interfaces of the server are connected to different switches, and different switches are connected to different storage device controllers. Thus, when the server wants to access the storage medium in the storage device, the server first connects to a storage device controller through a switch, and then locates the specific storage medium through the storage device controller. When the access path fails, the server can connect to another storage device controller through another switch, and then locate the storage medium through the other storage device controller, thereby implementing multi-path switching. Since the path in the conventional multi-path storage system is built based on the IP address, the server is actually connected to the IP address of the different storage device controller through a plurality of different paths.

It can be seen that in the traditional multi-path storage system, the multi-path switching can only be implemented to the level of the storage device controller, and the multi-path cannot be implemented between the storage device controller and the specific storage medium. Switch. Therefore, the conventional multi-path storage system can only cope with the network failure between the server and the storage device controller, and cannot cope with a single point failure of the storage device controller itself.

Summary of the invention

In view of this, the embodiments of the present invention provide a storage system, an access control method for the storage system, and an access control device for the storage system, which solves the problem that the traditional multi-path storage system cannot achieve multi-path switching to the storage medium. .

An embodiment of the invention provides a storage system, including:

SAS storage network, including at least one SAS switch;

At least two storage nodes connected to the SAS storage network;

At least one storage device connected to the SAS storage network;

At least one computing node, each storage node corresponding to one or more computing nodes of the at least one computing node;

Each storage device includes at least one storage medium having a SAS storage network configured to enable each storage node to directly access all of the storage media without resorting to other storage nodes.

An embodiment of the present invention further provides an access control method for a storage system, where the storage system includes: a SAS storage network, including at least one SAS switch; at least two storage nodes connected to the SAS storage network; at least one storage a device, coupled to the SAS storage network; and at least one compute node, each storage node corresponding to one or more compute nodes of the at least one compute node; wherein each storage device includes at least one storage having a SAS interface Media, the SAS storage network is configured such that each storage node can directly access all storage media without resorting to other storage nodes; the method includes:

When any one storage node fails, the computing node connected to the failed storage node reads and writes the storage medium through other storage nodes.

An embodiment of the present invention further provides an access control device for a storage system.

The storage system includes: a SAS storage network including at least one SAS switch; at least two storage nodes connected to the SAS storage network; at least one storage device connected to the SAS storage network; and at least one computing node, each One storage node corresponds to one or more of the at least one computing node; wherein each storage device includes at least one storage medium having a SAS interface, the SAS storage network being configured such that each storage node can Direct access to all storage media without the need for additional storage nodes; the device includes:

The access path switching module is configured to: when any one of the storage nodes fails, cause the computing node connected to the failed storage node to read and write the storage medium through the other storage node.

An embodiment of the present invention also provides a computer program product embodied in a computer readable storage medium having computer readable program code portions stored therein, the computer readable program code portion being Configured to perform an access control method to the storage system as described.

The storage system, the access control method for the storage system, and the access control device for the storage system are provided by the SAS storage network based on the SAS switch, and the storage medium in the storage device is connected through the SAS interface of the storage device. The storage device, the storage node and the storage device also access the SAS storage network through respective SAS interfaces, so that the storage node can directly access the specific storage medium based on the SAS address of the storage medium. At the same time, since the SAS storage network is configured such that each storage node can directly access all storage media without using other storage nodes, all storage media in the storage device constitute a global storage pool, and each storage node can pass through the SAS switch. Read any storage medium in the global storage pool. This enables multipath switching between storage nodes connected to storage media.

DRAWINGS

FIG. 1 is a schematic structural diagram of a conventional multi-path storage system provided by the prior art.

FIG. 2 is a schematic structural diagram of a storage system according to an embodiment of the invention.

FIG. 3 is a schematic structural diagram of a storage system according to another embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a conventional storage system provided by the prior art.

FIG. 5 is a schematic structural diagram of a storage system according to another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 2 is a schematic structural diagram of a storage system according to an embodiment of the present invention. As shown in FIG. 2, the storage system includes: a SAS storage network including at least one SAS switch; at least two storage nodes connected to the SAS storage network; at least one storage device connected to the SAS storage network; and at least a computing node, each storage node corresponding to one or more computing nodes of the at least one computing node; wherein each storage device includes at least one storage medium having a SAS interface, the SAS storage network being configured such that each A storage node can directly access all storage media without the need for additional storage nodes. In the embodiment of the present invention, the storage node is a software module that provides a storage service, instead of a hardware server including a storage medium in a general sense. The storage nodes in the description of the subsequent embodiments also refer to the same concepts, and therefore will not be described again.

As shown in the above description, the storage medium in the storage device is connected to the storage device through its SAS interface, and the storage node and the storage device are also accessed through the respective SAS interfaces. The SAS storage network enables the storage node to directly access a particular storage medium based on the SAS address of the storage medium. At the same time, since the SAS storage network is configured such that each storage node can directly access all storage media without using other storage nodes, all storage media in the storage device constitute a global storage pool, and each storage node can pass through the SAS switch. Read any storage medium in the global storage pool. This enables multipath switching between storage nodes connected to storage media.

The storage system of the storage system adopts a SAS storage network composed of SAS switches. Compared with the traditional IP-based storage solution, it has the advantages of high performance, large bandwidth, and a large number of disks per device. When used in conjunction with a host adapter (HBA) or a SAS interface on a server board, the storage provided by the SAS system can be easily accessed by multiple servers connected simultaneously. Specifically, the SAS switch is connected to the storage device through a SAS line, and the storage device and the storage medium are also connected by a SAS interface. For example, the storage device internally connects the SAS channel to each storage medium (can be set inside the storage device) A SAS switch chip), the SAS storage network can be directly connected to the storage medium, which has unique advantages over existing multi-paths built on FC networks or Ethernet. At the same time, the bandwidth of the SAS storage network can reach 24Gb or 48Gb, which is several times that of Gigabit Ethernet, and several times that of expensive 10 Gigabit Ethernet. The link layer SAS has an order of magnitude improvement over the IP network. The transport layer, because the TCP protocol is closed three times, the overhead is high, and the TCP delay acknowledgement mechanism and slow start sometimes cause a delay of 100 milliseconds, while the delay of the SAS protocol is only a fraction of that of TCP. There is a greater improvement. In summary, SAS storage networks offer significant advantages in terms of bandwidth and latency over Ethernet-based TCP/IP.

Based on the storage system structure, since the storage node is independent of the storage device setting, and the SAS storage network is configured such that each storage node can directly access all the storage media without using other storage nodes, each computing node can pass any A storage node is coupled to each of the at least one storage device, thereby enabling multi-path access by the same compute node through different storage nodes. Each storage node in the formed storage system architecture has a standby node, which can effectively cope with a single point failure of the storage node, and the path switching process can be completed immediately after a single point of failure, and the fault tolerance has no switching takeover time.

Therefore, based on the storage system structure shown in FIG. 2, an embodiment of the present invention further provides an access control method for a storage system, including: a computing node connected to a faulty storage node when any one of the storage nodes fails Read and write storage media through other storage nodes. Thus, when a single point of failure of the storage node occurs, the compute node connected to the failed storage node can implement multipath access through other storage nodes.

In an embodiment of the present invention, the physical server where each storage node is located has at least one SAS interface, and at least one SAS interface of the physical server where each storage node is located is respectively connected to at least one SAS switch; each storage device has at least one A SAS interface, at least one SAS interface of each storage device is respectively connected to at least one SAS switch. In this way, each storage node can access the storage medium through at least one SAS path. The SAS path is composed of any SAS interface of the physical server where the storage node currently accessing the storage node, a SAS switch corresponding to any SAS interface, a SAS interface of the storage device to be accessed, and a SAS interface of the storage medium to be accessed.

It can be seen that the same computing node can access the storage medium through at least one SAS path of the same storage node, in addition to multi-path access through different storage nodes. When a storage node has multiple SAS paths accessing the storage medium, the computing node can implement multi-path access through multiple SAS paths of the storage node. Therefore, in summary, each computing node can access the storage medium through at least two access paths; wherein at least two access paths include different SAS paths of the same storage node, or any SAS of different storage nodes. path.

FIG. 3 is a schematic structural diagram of a storage system according to another embodiment of the present invention. As shown in FIG. 3, unlike the storage system shown in FIG. 2, the storage system includes at least two SAS switches; each physical node where the storage node is located has at least two SAS interfaces, and the physical server where each storage node is located At least two SAS interfaces are respectively connected to at least two SAS switches; each storage device has at least two SAS interfaces, and at least two SAS interfaces of each storage device are respectively connected to at least two SAS switches. Thus, each of the at least two storage nodes can access the storage medium through at least two SAS paths, where each SAS path corresponds to a different SAS interface of the physical server where the storage node is located, and the different SAS interfaces correspond to Different SAS switches. At the same time, since each storage device has at least two SAS interfaces, and the storage medium in each storage device is fixed, different SAS interfaces of the same storage device are connected to the same storage medium through different lines. .

It can be seen that, based on the storage system structure shown in FIG. 3, the storage node accesses the storage medium at the computing node. On the access path, there is a single point of failure for any single point of failure between the storage node and the SAS switch, which can effectively handle any single point failure of any node in any access path. Therefore, based on the storage system structure shown in FIG. 3, an embodiment of the present invention further provides an access control method for a storage system, including: a storage node connected to a faulty SAS path when any one SAS path fails. The storage medium is read and written by the other SAS path. The SAS path is any SAS interface of the physical server where the storage node currently accessing the SAS interface, the SAS switch corresponding to any SAS interface, the SAS interface of the storage device to be accessed, and the to-be-accessed. The SAS interface of the storage medium is constructed.

It should be understood that when the SAS storage network includes multiple SAS switches, different storage nodes can still perform multi-path access to the storage medium based on the same SAS switch, that is, when any one storage node fails, the computing node connected to the failed storage node The storage medium can be read and written by other storage nodes but based on the same SAS switch.

In an embodiment of the present invention, since each storage medium in the SAS storage network has a SAS address, when a storage node is connected to a storage medium in a storage device through any one of the SAS switches, The SAS address of the storage device to be connected in the SAS storage network is used to locate the location of the storage medium to be connected. In a further embodiment, the SAS address can be a globally unique WWN (World Wide Name) code.

In a conventional storage system, the storage system is usually composed of a plurality of distributed storage nodes connected by a TCP/IP network. FIG. 4 shows a schematic diagram of the architecture of a prior art storage system. As shown in FIG. 4, in a conventional storage system, each storage node S is connected to a TCP/IP network (through a core switch) through an access network switch. Each storage node is a separate physical server, and each server has its own storage medium. Each storage node is connected by a storage network such as an IP network to form a storage pool. On the other side of the core switch, each compute node C is also connected to the TCP/IP network (through the core network switch) through the access network switch to access the entire storage pool over the TCP/IP network. It can be seen that in the existing traditional storage system structure, the storage node is located on the storage medium side, or strictly speaking, the storage medium is the physical machine where the storage node is located. Built-in disk.

In the storage system provided by the embodiment of the present invention, the physical machine where the storage node is located is independent of the storage device, and each storage node and one computing node are set in a physical server, and the physical server passes through the SAS storage network and the storage device. connection. The storage node can directly access the storage medium through the SAS storage network, so the storage device is more used as a channel connecting the storage medium and the storage network.

The aggregated storage system in which the computing node and the storage node are located in the same physical machine constructed by using the embodiment of the present invention can reduce the number of physical devices required, thereby reducing the cost. At the same time, the compute node can also access the storage resources it wishes to access locally. In addition, since the compute nodes and storage nodes are aggregated on the same physical server, the data exchange between the two can be as simple as shared memory, and the performance is particularly excellent. In this way, when dynamic balancing is required, physical data does not need to be migrated in different storage media, and only storage media managed by different storage nodes need to be balanced.

In the storage system provided by the embodiment of the present invention, the storage node is independent of the storage device setting, and the storage node and the computing node, and the I/O data path length between the computing node and the storage medium includes: (1) storage medium to storage Nodes; and (2) storage nodes to compute nodes (CPU bus lanes) that are aggregated on the same physical server. In the storage system provided by the prior art shown in FIG. 4, the I/O data path length between the computing node and the storage medium includes: (1) storage medium to the storage node; (2) storage node to the storage network. Access network switch; (3) storage network access network switch to core network switch; (4) core network switch to computing network access network switch; and (5) computing network access network switch to computing node. Obviously, the total data path of the storage system of the embodiment of the present invention is only close to item (1) of the conventional storage system. That is, the storage system provided by the embodiment of the present invention can greatly improve the I/O channel performance of the storage system by extremely compressing the I/O data path length, and the actual running effect is very close to the I/O of the local hard disk. O channel.

It should be understood that although the physical server where each computing node is located has a storage node, the computing nodes in one physical server can also pass through the existence of a network connection between the physical servers. A storage node in another physical server accesses the storage medium so that the same compute node can perform multi-path access to the storage medium through different storage nodes.

In an embodiment of the invention, the storage node may be a virtual machine of the physical server, a container, a module running directly on the physical operating system of the server, or a combination thereof (for example, a firmware of a part of the storage node on the expansion card, The other part is a module in the physical operating system, and some are in the virtual machine); the computing node can also be a virtual machine of the same physical machine server, a container, and a module running directly on the physical operating system of the server. Or the combination above. In one embodiment, each storage node may correspond to one or more compute nodes.

Specifically, one physical server may be divided into multiple virtual machines, one of which is used as a storage node, and the other virtual machine is used as a computing node; or a module on the physical OS is used as a storage node, so as to implement Better performance.

In an embodiment of the invention, the virtualization technology forming the virtual machine may be KVM or Zen or VMware or Hyper-V virtualization technology, and the container technology forming the container may be Docker or Rocket or Odin or Chef or LXC or Vagrant. Or Ansible or Zone or Jail or Hyper-V container technology.

In an embodiment of the present invention, each storage node is only responsible for managing a fixed storage medium at the same time, and one storage medium is not simultaneously written by multiple storage nodes to avoid data conflict, thereby enabling each storage node to be able to implement each storage node. The storage medium managed by it is accessed without resorting to other storage nodes, and the integrity of the data stored in the storage system can be guaranteed.

In an embodiment of the present invention, all the storage media in the system may be divided according to storage logic. Specifically, the storage pool of the entire system may be divided into a logical storage hierarchy structure such as a storage area, a storage group, and a storage block. Among them, the storage block is the smallest storage unit. In an embodiment of the invention, the storage pool may be divided into at least two storage areas.

In an embodiment of the invention, each storage area may be divided into at least one storage group. In a preferred embodiment, each storage area is divided into at least two storage groups.

In some embodiments, the storage area and the storage group can be merged such that one level can be omitted in the storage hierarchy.

In an embodiment of the invention, each storage area (or storage group) may be composed of at least one storage block, wherein the storage block may be a complete storage medium or a part of a storage medium. In order to construct redundant storage inside the storage area, each storage area (or storage group) may be composed of at least two storage blocks, and when any one of the storage blocks fails, the complete storage block may be calculated from the remaining storage blocks in the group. The data is stored. The redundant storage mode can be multi-copy mode, independent redundant disk array (RAID) mode, and erasure code mode. In an embodiment of the invention, the redundant storage mode can be established by the ZFS file system. In an embodiment of the present invention, in order to combat the hardware failure of the storage device/storage medium, the plurality of storage blocks included in each storage area (or storage group) are not located in the same storage medium, or even located in the same storage medium. In the storage device. In an embodiment of the invention, any two storage blocks included in each storage area (or storage group) are not located in the same storage medium/storage device. In another embodiment of the present invention, the number of storage blocks located in the same storage medium/storage device in the same storage area (or storage group) is preferably less than or equal to the redundancy of the redundant storage. For example, when the RAID 5 mode of redundancy is used, the redundant storage redundancy is 1, and the number of storage blocks in the same storage group of the same storage device is at most 1; for RAID 6, the redundant storage is With a redundancy of 2, the number of memory blocks in the same storage group on the same storage device is up to 2.

In an embodiment of the invention, each storage node can only read and write its own managed storage area. Since the read operations of the same storage block by multiple storage nodes do not conflict with each other, and multiple storage nodes write one storage block at the same time, conflicts are easily generated. Therefore, in another embodiment, each storage node can only Write the storage area managed by yourself, but you can read the storage area managed by yourself and the storage area managed by other storage nodes, that is, the write operation is local, but the read operation can be global.

In one embodiment, the storage system may further include a storage control node coupled to the SAS storage network for determining a storage area managed by each storage node. In another embodiment, Each storage node may include a storage allocation module for determining a storage area managed by the storage node, which may be implemented by a communication and coordination processing algorithm between each storage allocation module included in each storage node, and the algorithm may For example, in order to load balance between storage nodes as a principle.

In an embodiment of the present invention, the storage medium may include, but is not limited to, a hard disk, a flash memory, an SRAM, a DRAM, an NVME, or an NVRAM. The access interface of the storage medium may include, but is not limited to, a SAS interface, a SATA interface, and a PCI/e interface. DIMM interface, NVMe interface, SCSI interface, AHCI interface.

FIG. 5 is a schematic structural diagram of a storage system according to another embodiment of the present invention. As shown in FIG. 5, the storage device in the storage system 30 is constructed as a plurality of JBODs 307-310, which are respectively connected to two SAS switches 305 and 306 through SAS data lines, and the two SAS switches constitute a storage system. The switching core of the SAS storage network has at least two servers 301 and 302. The server 301 has at least two adapters 301a and 301b, at least two adapters 301a and 301b are respectively connected to at least two SAS switches 305 and 306; the server 302 has at least two adapters 302a and 302b, and at least two adapters 302a and 302b respectively At least two SAS switches 305 and 306 are connected. Based on the storage system structure shown in FIG. 5, the access control method provided by an embodiment of the present invention may further include: when any one of the storage nodes fails, the storage node is connected to the corresponding SAS switch through another adapter. For example, when the adapter 302a of the server 302 fails, the server 302 cannot be connected to the SAS switch 305 through the adapter 302a, and the server 302 can still be connected to the SAS switch 306 through the adapter 302b.

There is a basic network connection between the servers for monitoring and communication. Each server has a storage node that manages some or all of the disks in all JBOD disks using information obtained from the SAS links. Specifically, the storage area, the storage group, and the storage block described above in the application file may be used to divide the JBOD disk into different storage groups. Each storage node manages one or more sets of such storage groups. When each storage group adopts redundant storage mode, it can store redundant The stored metadata exists on the disk so that the redundant storage can be directly identified from the disk by other storage nodes.

In the exemplary storage system 30 shown, the storage node can install a monitoring and management module that is responsible for monitoring the status of local storage and other servers. When a JBOD is abnormal overall or a disk on the JBOD is abnormal, data reliability is ensured by redundant storage. When a server fails, the management module in the storage node on another pre-configured server will locally identify and take over the disk managed by the storage node of the failed server according to the data on the disk. The storage node originally provided by the storage node of the faulty server will also be extended on the storage node on the new server. So far, a new highly available global storage pool structure has been implemented.

As can be seen, the exemplary storage system 30 is constructed to provide a multi-point, controllable, globally accessible storage pool. The hardware uses multiple servers to provide external services, and uses JBOD to store disks. Multiple JBODs are connected to two SAS switches, and the two switches are respectively connected to the two HBA cards of the server, thereby ensuring that all disks on the JBOD can be accessed by all servers. The SAS redundant link also ensures high availability on the link.

Locally, each server uses redundant storage technology to select redundant disks from each JBOD to avoid redundant data loss. When one server fails, the module that monitors the overall state will schedule another server to access the disks managed by the storage node of the failed server through the SAS channel, and quickly take over the disks that the other party is responsible for, achieving high-available global storage.

Although the JBOD storage disk has been described as an example in FIG. 5, it should be understood that the embodiment of the present invention as shown in FIG. 5 also supports a storage device other than JBOD. In addition, the above is an example in which one storage medium (entire) is used as one storage block, and the same applies to a case where a part of one storage medium is used as one storage block.

An embodiment of the present invention further provides an access control device for a storage system, where the storage system includes: a SAS storage network, including at least one SAS switch; at least two storage nodes connected to the SAS storage network; at least one a storage device connected to the SAS storage network; And at least one computing node, each storage node corresponding to one or more of the at least one computing node; wherein each storage device includes at least one storage medium having a SAS interface, the SAS storage network configured to Enabling each storage node to directly access all storage media without resorting to other storage nodes; the device includes:

The access path switching module is configured to: when any one of the storage nodes fails, cause the computing node connected to the failed storage node to read and write the storage medium through the other storage node.

In an embodiment of the present invention, the SAS storage network includes at least two SAS switches, each of which has a physical server having at least two SAS interfaces, and at least two SAS interfaces of the physical server where each storage node is located and at least The two SAS switches are connected to each other; each storage device has at least two SAS interfaces, and at least two SAS interfaces of each storage device are respectively connected to at least two SAS switches; in this case, the access path switching module can be further configured as When any SAS path fails, the storage node connected to the faulty SAS path reads and writes the storage medium through other SAS paths; wherein the SAS path is any SAS interface of the physical server where the storage node currently accessing is located, It should be composed of a SAS switch of any SAS interface, a SAS interface of the storage device to be accessed, and a SAS interface of the storage medium to be accessed.

An embodiment of the invention further provides a computer program product of a computer readable storage medium, comprising computer program code, which when executed by a processor, enables the processor to be implemented according to the method of the embodiments of the invention The access control method for the storage system described in the embodiment. The computer storage medium can be any tangible medium such as a floppy disk, CD-ROM, DVD, hard drive, or even network media.

It should be understood that although an implementation form of the embodiments of the present invention described above may be a computer program product, the method or apparatus of the embodiments of the present invention may be implemented in software, hardware, or a combination of software and hardware. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated design hardware. One of ordinary skill in the art will appreciate that the methods and apparatus described above can be used The computer executable instructions are implemented and/or embodied in processor control code, such as a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as a read only memory (firmware), or an optical or electronic signal. Such code is provided on the data carrier of the carrier. The method and apparatus of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., also It can be implemented by software executed by various types of processors, or by a combination of the above-described hardware circuits and software such as firmware.

It should also be understood that the descriptions of the present invention are merely illustrative of some key, non-essential techniques and features, and may not be described in a manner that can be realized by those skilled in the art.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., which are within the spirit and principles of the present invention, should be included in the scope of the present invention. within.

Claims (15)

A storage system, comprising: SAS storage network, including at least one SAS switch; At least two storage nodes connected to the SAS storage network; At least one storage device connected to the SAS storage network; At least one computing node, each storage node corresponding to one or more computing nodes of the at least one computing node; Each storage device includes at least one storage medium having a SAS storage network configured to enable each storage node to directly access all of the storage media without resorting to other storage nodes. The storage system of claim 1 wherein each of said at least one compute node is connectable to each of said at least one storage device by any one of said storage nodes. The storage system according to claim 2, wherein each physical server in which the storage node is located has at least one SAS interface, and at least one SAS interface of each physical server where the storage node is located is respectively associated with the at least one SAS interface Each of the storage devices is provided with at least one SAS interface, and at least one SAS interface of each of the storage devices is respectively connected to the at least one SAS switch. The storage system according to claim 3, wherein each of said storage nodes can access a storage medium through at least one SAS path; The SAS path is formed by any SAS interface of the physical server where the storage node currently accessing the storage node, the SAS switch corresponding to the any SAS interface, the SAS interface of the storage device to be accessed, and the SAS interface of the storage medium to be accessed. . The storage system according to claim 4, wherein each of the at least one computing node is connectable to each of the at least one storage device by any one of the storage nodes, including: Each of the computing nodes accesses the storage medium through at least two access paths; wherein the at least two access paths comprise different SAS paths of the same storage node, or any one of the SAS paths of different storage nodes. The storage system according to claim 5, wherein the SAS storage network comprises at least two SAS switches; wherein each physical server in which the storage node is located has at least two SAS interfaces, each of the storage At least two SAS interfaces of the physical server where the node is located are respectively connected to the at least two SAS switches; each of the storage devices has at least two SAS interfaces, and at least two SAS interfaces of each of the storage devices are respectively associated with The at least two SAS switches are correspondingly connected. The storage system according to claim 6, wherein each of the storage nodes can access the storage medium through at least two SAS paths, wherein each SAS path corresponds to a different SAS interface of the physical server where the storage node is located . The storage system of claim 6 wherein the different SAS interfaces of the same storage device are connected to the same storage medium by different lines. The storage system according to any one of claims 1 to 8, wherein the storage node uses the SAS address of the storage medium to locate the location of the storage medium when accessing the storage medium. The storage system of claim 9 wherein the SAS address of the storage medium is WWN encoded. An access control method for a storage system, the storage system comprising: a SAS storage network, including at least one SAS switch; at least two storage nodes connected to the SAS storage network; at least one storage device, connected And to the SAS storage network; and at least one computing node, each storage node corresponding to one or more of the at least one computing node; wherein each storage device comprises at least one storage medium having a SAS interface, The SAS storage network is configured such that each storage node can directly access all storage media without resorting to other storage nodes; the method includes: When any one of the storage nodes fails, the compute node connected to the failed storage node is connected. Read and write storage media through other storage nodes. The access control method according to claim 11, wherein the SAS storage network comprises at least two SAS switches, and each physical server in which the storage node is located has at least two SAS interfaces, and each of the storage nodes The at least two SAS interfaces of the physical server are respectively connected to the at least two SAS switches; each of the storage devices has at least two SAS interfaces, and at least two SAS interfaces of each of the storage devices respectively The at least two SAS switches are connected to each other; wherein the method further includes: When any one SAS path fails, the storage node connected to the faulty SAS path reads and writes the storage medium through the other SAS path; wherein the SAS path is any SAS interface of the physical server where the storage node currently performing access is located, The SAS switch corresponding to any one of the SAS interfaces, the SAS interface of the storage device to be accessed, and the SAS interface of the storage medium to be accessed are configured. The access control method according to claim 11 or 12, wherein the storage node uses the SAS address of the storage medium to locate the location of the storage medium when the storage medium reads and writes the storage medium. An access control device for a storage system, the storage system comprising: a SAS storage network, including at least one SAS switch; at least two storage nodes connected to the SAS storage network; at least one storage device, connected And to the SAS storage network; and at least one computing node, each storage node corresponding to one or more of the at least one computing node; wherein each storage device comprises at least one storage medium having a SAS interface, The SAS storage network is configured such that each storage node can directly access all storage media without resorting to other storage nodes; the device includes: The access path switching module is configured to: when any one of the storage nodes fails, cause the computing node connected to the failed storage node to read and write the storage medium through the other storage node. The device according to claim 14, wherein the SAS storage network comprises at least two SAS switches, each physical server where the storage node is located has at least two SAS interfaces, and each of the storage nodes is located At least two SAS interfaces of the physical server And the at least two SAS interfaces are respectively connected to the at least two SAS switches, and each of the storage devices has at least two SAS interfaces, and at least two SAS interfaces of each of the storage devices are respectively connected to the at least two SAS switches; The access path switching module is further configured to: when any one of the SAS paths fails, the storage node connected to the faulty SAS path reads and writes the storage medium through the other SAS path; wherein the SAS path is accessed by the current execution. The SAS interface of the physical server where the storage node is located, the SAS switch corresponding to any one of the SAS interfaces, the SAS interface of the storage device to be accessed, and the SAS interface of the storage medium to be accessed.

Images