JP3743975B2 - Storage system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage device system, and more particularly, a storage device system that requires only a minimum number of data transfer paths when a control device is added, and the latest write time of data stored in a plurality of control devices is easily known. The present invention relates to a storage system that can be used.
[0002]
[Prior art]
FIG. 5 is a block diagram showing an example of a remote dual writing system including a conventional storage device system.
The remote dual writing system 5 includes a storage device including one or more host devices 100, a plurality of control devices 601 and 603 having nonvolatile memories, and disk devices 102 and 105 connected to the control devices 601 and 603, respectively. An apparatus system 50 is included.
[0003]
The storage device system 50 includes one or more primary control devices 601 connected to the host device 100, one or more disk devices 102 connected to the primary control device 601, and the primary control device 601. One or more sub-control devices 603 and one or more disk devices 105 connected to the sub-control devices 603 are provided.
The primary control device 601 is connected to a secondary control device 603, which is a data transfer destination of data to be written twice, by a data transfer path. The primary control device 601 receives the write data and write time issued from the host device 100, notifies the host device 100 of a write request completion report, and stores the write data and write time in the nonvolatile memory and the disk device 102. At the same time, the data is asynchronously transferred to the sub-control device 603 via the data transfer path (this is called an asynchronous data duplexing technique).
The sub-control device 603 receives the write data and the write time and stores them in the nonvolatile memory and the disk device 105.
Here, it is necessary to compare the write times of the write data transferred to the respective sub control devices 603 and determine the time for guaranteeing the data consistency between the primary and secondary control devices. Are connected by a data transfer path.
[0004]
The asynchronous data duplication technique is disclosed in, for example, Japanese Patent Publication No. 8-509565.
[0005]
[Problems to be solved by the invention]
In the conventional storage device system 50 shown in FIG. 5, each primary control device 601 needs to be connected to all the sub-control devices 603 serving as data transfer destinations by data transfer paths. Further, the sub-control devices 603 need to be connected by a data transfer path.
However, such a configuration has a problem that it is necessary to add a large number of data transfer paths when adding the primary and secondary control devices.
Further, the conventional storage device system 50 has a problem in that it is difficult to know the latest write time of the write data stored in the nonvolatile memory and the disk device 105 of each control device, which is inconvenient in operation.
Accordingly, a first object of the present invention is to provide a storage system that requires only a minimum number of data transfer paths when adding primary and secondary control devices.
A second object of the present invention is to provide a storage device system that can easily know the latest write time of write data stored in the nonvolatile memory and storage device of each control device.
[0006]
[Means for Solving the Problems]
In a first aspect, the present invention is a storage device system including a plurality of higher-level devices, a plurality of control devices, and a storage device connected to each of the plurality of control devices, and the plurality of control devices Is composed of one or more primary control devices, one representative sub-control device, and a plurality of non-representative sub-control devices, and the representative sub-control device and the plurality of non-representative sub-control devices include the one or more the write data stored in the storage device connected to any of the positive control device, which is also stored in a storage device connected to itself, the plurality of non-representative and the one representative sub-control unit the sub-control unit are layered, wherein the plurality of higher-level device and said primary control unit is connected by a data transfer path, wherein the positive control and the representative sub-control unit are connected by a data transfer path, the representative sub Control device Wherein the plurality of non-representative sub-control unit are connected by a data transfer path, wherein the positive control device and said plurality of non-representative sub-control unit, is connected via at least the representative sub-control unit, said plurality of host systems write data issued to the positive control from said transferred from the primary controller to the representative sub-control unit, is further transferred from the representative sub-control unit to one of said plurality of non-representative sub-control unit is intended, the representative sub-control device, receives the write data sent is the representative sub-control unit, and the write data transmission destination is either the plurality of non-representative sub-control unit, both Determining the transmission destination of the write data and storing it in a storage device connected to itself when the transmission destination is own, and transmitting destination when the transmission destination is any of the plurality of non-representative sub- control devices Non Send Table sub-control device, the non-representative sub-control unit of the transmission destination, stores the data transmitted from the primary controller receives via the representative sub-control unit, a storage device connected to itself A storage device system is provided.
In the first aspect of the storage system, each of the positive control device, the transfers only the representative sub-controllers may be connected only to the data transfer path representative sub-control unit. Further, since the representative sub- control device can compare the write times and determine the time for guaranteeing data consistency, each non-representative sub- control device may connect the data transfer path only to the representative sub- control device. Therefore, fewer data transfer paths than before are required, and the configuration can be simplified. Then, the minimum number of data transfer paths can be increased when the primary and secondary control devices are added.
[0007]
In a second aspect, the present invention is the above first aspect by the storage device system, the previous SL positive control and the representative sub-control unit and the non-representative sub-control unit are sequentially layered, higher-level device The write data and write time issued from the primary control device to the representative sub- control device, and further from the representative sub- control device to the non-representative sub- control device are transferred in hierarchical order. The primary control device receives the write data and the write time issued from the host device, notifies the host device of a write request completion report, and connects to the nonvolatile memory included in the host controller and the host controller. stores in the storage devices is transferred to the representative sub-control unit, the representative auxiliary control device includes a ride data and the write time transfer destination is the representative sub-control unit, the transfer destination is non-representative sub It receives both the write data and the write time as the control device, determines the transfer destination of the write data, and if the transfer destination is itself, stores it in its own nonvolatile memory and a storage device connected to itself. When the transfer destination is the plurality of non-representative sub- control devices, transfer to the transfer-destination non-representative sub- control device, and the transfer destination non-representative sub- control device receives the write data and the write time, There is provided a storage device system characterized in that the storage device is stored in a nonvolatile memory and a storage device connected to the nonvolatile memory.
[0009]
In a third aspect, the present invention provides the storage device system according to the second aspect, wherein the representative sub- control device and the non-representative sub- control device have the latest write time of the write data stored in their own non-volatile memory. There is provided a storage device system characterized by having a latest write time display means for displaying the latest one.
In the storage system according to the third aspect, since the latest write time of the write data stored in each sub- control device is displayed, it can be easily referred from the outside.
[0010]
In a fourth aspect, the present invention relates to the write time of the write data stored in the nonvolatile memory of each of the representative sub- control device and the non-representative sub- control device in the storage device system of the second or third aspect. There is provided a storage system characterized by providing latest write time collective display means for collectively displaying the latest ones.
In the storage system according to the fourth aspect, since the latest write times of the write data stored in each sub- control device are collectively displayed, all the latest write times can be referred to at an arbitrary place.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited thereby.
[0012]
FIG. 1 is a configuration diagram of a remote dual writing system including a storage device system according to an embodiment of the present invention.
The remote dual writing system 1 includes one or more host devices 100, a plurality of control devices 101, 103, 104 having nonvolatile memories, and disk devices 102, 105 connected to the control devices 101, 103, 104, respectively. The storage device system 10 is provided.
[0013]
The storage device system 10 is commonly connected to one or more primary control devices 101 connected to the host device 100, one or more disk devices 102 connected to the primary control device 101, and the primary control device 101. The representative sub-control device 103, one or more sub-control devices 104 connected to the representative sub-control device 103, and one or more disk devices connected to the representative sub-control device 103 and the sub-control device 104, respectively. 105.
The primary control device 101 is connected to the representative secondary control device 103 by a data transfer path. The primary control device 101 receives the write data and write time issued from the host device 100, notifies the host device 100 of a write request completion report, and stores the write data and write time in the nonvolatile memory and the disk device 102. At the same time, the data is transferred asynchronously to the representative sub-controller 103 via the data transfer path.
The representative sub-control device 103 is connected to a sub-control device 104 that is a data transfer destination of data to be written twice by a data transfer path. Then, the representative secondary control device 103 receives the write data and the write time transferred from each primary control device 101, compares the latest write time of the write data, and sets a time for guaranteeing data consistency between the primary and secondary control devices. And determine the transfer destination of the write data. If the transfer destination is own, it is stored in the non-volatile memory and the disk device 105. If the transfer destination is another sub-control device 104, the transfer destination is determined via the data transfer path. The write data and the write time are transferred to the sub control device 104.
The sub control device 104 receives the write data and the write time and stores them in the nonvolatile memory and the disk device 105.
[0014]
FIG. 2 shows an internal configuration example of the representative sub-control device 103. The internal configuration of the sub control device 104 is the same.
The representative sub-control device 103 includes a control unit 304 and a nonvolatile memory 310 therein.
The control unit 304 includes a write issue order analysis unit 305, a write data aggregation unit 306, a write transfer order determination unit 307, a transfer destination secondary control device analysis unit 308, and a primary / secondary data consistency guarantee time display unit 309. Have.
[0015]
The write issue order analysis unit 305 rearranges the transferred write data in the order issued from the higher-level device 100 for each primary control device 101 and stores the data in the write data aggregation unit 306.
The write transfer order determination unit 307 selects the write data with the oldest write request time among the write data of all the primary control devices in the write data aggregation unit 306, and sequentially transfers the write data to each sub control device 104. The determination of the transfer destination of the write data is performed by the transfer destination sub-control device analysis unit 308.
[0016]
That is, the representative secondary control device 103 reflects the write data in its nonvolatile memory 310 and disk device 105 when the secondary control device of the data transfer destination is itself. If the data transfer destination sub-control device is other than itself, the write data is transferred to another corresponding sub-control device 104.
The secondary control device 104 that has received the write data reflects the write data in its own nonvolatile memory 310 and disk device 105.
[0017]
When the reflection of the write data from the primary control device 101 to the representative secondary control device 103 or the non-volatile memory 310 of the secondary control device 104 is completed, data consistency between the primary and secondary control devices is maintained until the write request time of the write data. Will be.
The representative sub-control device 103 and each sub-control device 104 store the latest write time in the primary / secondary data consistency guarantee time display unit 309 and enables external reference.
[0018]
FIG. 3 shows a processing flow of the representative sub-control device 103.
The representative secondary control device 103 receives the write data transferred from each primary control device 101 (407).
The write data 401 includes a control information unit 402 generated by the primary control device 101 and an actual data unit 406 issued from the higher-level device 100.
The control information unit 402 includes a write order information unit 403 indicating the order of write requests from the host device 100 for each primary control device 101, a write time information unit 404 indicating a write request time from the host device 100, and write data And a transfer destination information unit 405 indicating a transfer destination.
[0019]
After receiving the write data, the representative sub control apparatus 103 rearranges the write data in the order of write issuance (408). That is, the order of write requests from the host device 100 for each primary control device 101 is recognized from the write order information unit 403, rearranged in the order by the write issue order analysis unit 305, and stored in the write data aggregation unit 306. .
[0020]
Next, the representative sub-control apparatus 103 determines the order of the write data to be transferred (409). That is, the write transfer order determination unit 307 recognizes the write request time from the host device 100 from the write time information unit 404, and selects the write data with the oldest write request time among the write data of all the primary control devices 101. The write data to be transferred is determined.
[0021]
Next, the representative sub control device 103 determines the sub control device of the data transfer destination (410). That is, the transfer destination sub-controller analysis unit 308 recognizes the transfer destination of the write data from the transfer destination information unit 405. Then transfer.
[0022]
FIG. 4 is an explanatory diagram of the latest write time batch display function.
The representative sub-control device 103 includes a latest write time display unit 503. The latest write time display unit 503 reads the latest write time of the write data transferred to the nonvolatile memory 310 of the representative sub control device 103 from the primary / sub data consistency guarantee time display unit 309 and displays it.
Each sub-control device 104 includes latest write time display units 5041 and 5042, respectively. These latest write time display units 5041 and 5042 read the latest write time of the write data transferred to the nonvolatile memory 310 of each sub control device 104 from the primary / sub data consistency guarantee time display unit 309 and display it.
[0023]
The latest write time batch display unit 506 is installed in the representative sub-control device 103, in the sub-control device 104, or separately from them, and includes the latest write time display units 503, 5041, and 5042. The latest write time of the representative sub control device 103 and the latest write times of all the sub control devices 104 are displayed together. Further, a latest write time display unit 505 is provided for separately displaying the latest write time among the latest write times.
The latest write time batch display unit 506 makes it possible to refer to all the latest write times at an arbitrary place.
[0024]
According to the storage device system 10 described above, each primary control device 101 may connect a data transfer path only to the representative secondary control device 103. Each sub-control device 104 may also connect a data transfer path only to the representative sub-control device 103. Therefore, fewer data transfer paths than before are required, and the configuration can be simplified. Then, the minimum number of data transfer paths can be increased when the primary and secondary control devices are added.
[0025]
Further, according to the storage system 10, the latest write time of the write data transferred to the nonvolatile memory 310 of each sub control device 104 can be easily referred from the outside. Further, it is possible to refer to all the latest write times at an arbitrary place.
[0026]
【The invention's effect】
According to the storage system of the present invention, the minimum number of data transfer paths can be increased when the primary and secondary control devices are added, and the cost can be reduced. In addition, the latest write time of the write data stored in each control device can be easily referred from the outside.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a remote dual writing system including a storage device system according to an embodiment of the present invention.
FIG. 2 is an internal configuration diagram of a representative sub-control device according to an embodiment of the present invention.
FIG. 3 is an operation explanatory diagram of a representative sub-control device according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram of a latest write time display operation according to an embodiment of the present invention.
FIG. 5 is a block diagram showing an example of a remote dual writing system including a conventional storage device system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Remote dual writing system 10 Storage system 100 Said apparatus 101 Primary control apparatus 103 Representative sub control apparatus 104 Sub control apparatus 102,105 Disk apparatus 503,5041,5042,505 Latest write time display part

Claims (4)

A storage device system comprising a plurality of host devices, a plurality of control devices, and a storage device connected to each of the plurality of control devices,
The plurality of control devices include one or more primary control devices, one representative sub-control device, and a plurality of non-representative sub-control devices,
The representative sub-control device and the plurality of non-representative sub-control devices transfer write data stored in a storage device connected to one of the one or more primary control devices to a storage device connected to the representative sub-control device. Is also stored,
Wherein said one representative sub control unit and the plurality of non-representative sub-control unit are layered,
The plurality of host devices and the primary control device are connected by a data transfer path,
The primary control device and the representative secondary control device are connected by a data transfer path,
The representative sub- control device and the plurality of non-representative sub- control devices are connected by a data transfer path,
The primary control device and the plurality of non-representative sub- control devices are connected via at least the representative sub- control device,
Write data issued to the positive control device from said plurality of host systems, the transferred from the primary controller to the representative sub-control unit, further, any of the representative sub-control unit of said plurality of non-representative sub-control unit Is transferred to
The representative secondary controller receives the write data sent is the representative sub-control unit, and the write data transmission destination is either the plurality of non-representative sub-control unit, both of the write data of determining the destination, stored in a storage device connected to itself if the transmission destination of his, non-representative of the destination when the destination of any of the plurality of non-representative sub-control device sub To the control device,
The transmission destination non-representative secondary control device receives the data transmitted from the primary control device via the representative secondary control device, and stores the data in a storage device connected to itself.
A storage device system. The storage device system according to claim 1,
Before Symbol the positive control and the representative sub-control unit and the non-representative sub-control unit are sequentially layered,
Write data and write time issued from the host device to the primary control device are hierarchically transferred from the primary control device to the representative secondary control device, and from the representative secondary control device to the non-representative secondary control device. Are transferred in order,
The primary control device receives the write data and write time issued from the host device, notifies the host device of a write request completion report, and stores it in its own nonvolatile memory and a storage device connected to itself. And transfer to the representative sub- control device,
The representative secondary controller receives the ride data and write the time the destination is the representative sub-control unit, the write data and the write time transfer destination is a non-representative sub-control device, both,
The transfer destination of the write data is determined. If the transfer destination is own, it is stored in its own nonvolatile memory and a storage device connected to itself. If the transfer destination is the plurality of non-representative sub- control devices, the transfer destination is stored. To the non-representative sub- controller
The transfer destination non-representative sub- control device receives the write data and the write time, and stores them in a nonvolatile memory provided to itself and a storage device connected to itself.
A storage device system. 3. The storage device system according to claim 2, wherein the representative sub- control device and the non-representative sub- control device display a latest write time display means for displaying a latest write data write time stored in a nonvolatile memory provided therein. A storage device system comprising: 4. The storage device system according to claim 2, wherein the latest write data stored in the nonvolatile memory of each of the representative sub- control device and the non-representative sub- control device is collectively displayed. A storage system comprising a latest write time batch display means.

Images