JP2013161112A - Information processor, controller, and information processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processor, a controller and an information processing method capable of improving performance when writing data to one or more storage devices.SOLUTION: The information processor includes: nonvolatile HDDs 105a to 105c; a nonvolatile SSD 109 capable of write at a higher speed than the HDDs 105a to 105c; an HDD write processing part 203 for writing data to the HDDs 105a to 105c; a journal write part 205 for storing the data written to the HDDs 105a to 105c respectively in the SSD 109; and a journal pointer control part 207 for invalidating the corresponding data stored in the SSD 109 after the write of the data to the HDDs 105a to 105c is completed.

Description

  Some embodiments according to the present invention relate to an information processing device, a control device, and an information processing method.

  Currently, in order to meet the demands for higher speed and larger capacity of storage devices, RAID (Dundant Array of Inexpensive Disks) technology is becoming widespread. Here, for the purpose of improving the response performance of the write function (write function) in RAID, there is a write cache technique (for example, Patent Document 1). In Patent Document 1, a write cache for temporarily writing data is provided in the controller, and when the data is written to the write cache in response to a write request from the host, an end report is returned to the host to write It describes that performance degradation during processing is prevented.

JP 2006-099802 A

  Here, each HDD (Hard Disk Drive) constituting the RAID usually includes a cache memory. Since the volatile memory is usually used as the cache memory on the HDD, the data is volatilized if a power failure occurs before the disk writing is completed. Therefore, the write cache function of the HDD is often disabled (Disable) in order to ensure reliability.

  In addition, although the technology described in Patent Document 1 refers to improving the processing performance of the control device itself that controls the disk array device, no consideration is given to improving the reliability and speed of each HDD constituting the RAID. Not.

  Some aspects of the present invention have been made in view of the above-described problems, and an information processing device, a control device, and an information processing method capable of improving performance when writing data to one or more storage devices are provided. One of the purposes is to provide it.

  An information processing apparatus according to the present invention includes one or more nonvolatile first storage devices, a nonvolatile second storage device that can be written at a higher speed than the first storage device, and the first storage device. First writing means for writing data to a device, data to be written to each of the one or more first storage devices, and sector information of the first storage device to which the data is written, Second writing means for storing in the storage device and invalidation for invalidating the corresponding data stored in the second storage device after the written data becomes non-volatile on the first storage device Means.

  The control device according to the present invention includes a first writing means for writing data to the one or more nonvolatile first storage devices, data to be written to each of the one or more first storage devices, Second writing means for writing sector information of the first storage device to which data is written to the second storage device, which is writable at a higher speed than the first storage device and is nonvolatile, Invalidation means for invalidating the corresponding data stored in the second storage device after the stored data becomes non-volatile on the first storage device.

  An information processing method according to the present invention includes a step of writing data to one or more nonvolatile first storage devices, data to be written to each of the one or more first storage devices, and writing the data. The sector information of the first storage device is stored in the second storage device that is writable at a higher speed than the first storage device, and the written data is stored in the first storage device. Invalidating the corresponding data stored in the second storage device after becoming non-volatile on the device.

  In the present invention, the “part” does not simply mean a physical means, but includes a case where the function of the “part” is realized by software. Further, the function of one “unit” may be realized by two or more physical means or devices, or the function of two or more “units” may be realized by one physical means or device.

  ADVANTAGE OF THE INVENTION According to this invention, the information processing apparatus, control apparatus, and information processing method which can aim at the performance improvement at the time of the data writing with respect to one or more memory | storage devices can be provided.

It is a functional block diagram which shows schematic structure of the server in embodiment of this invention. FIG. 2 is a functional block diagram relating to a write function of a disk array controller included in the server shown in FIG. 1. It is a figure for demonstrating the management method of the journal data by the server shown in FIG. It is a flowchart which shows the flow of the write-in process by the server shown in FIG. It is a flowchart which shows the flow of the data recovery process by the server shown in FIG.

  Embodiments of the present invention will be described below. In the following description and the description of the drawings to be referred to, the same or similar components are denoted by the same or similar reference numerals.

(Embodiment)
1 to 5 are diagrams for explaining an embodiment of the present invention. Hereinafter, embodiments will be described in detail with reference to these drawings.

(Overview)
FIG. 1 is a functional block diagram showing a schematic configuration of a server 10 which is an embodiment of an information processing apparatus according to the present invention. A server 10 according to FIG. 1 includes a host 101, a disk array controller 103, HDDs 105 a to 105 c constituting a disk array 105, a battery backup unit 107, and an SSD 109.

  The server 10 is an open architecture server and is a device that stores data in the disk array 105 that logically configures one storage device. The disk array controller 103 implements a journal function for writing data (write data) to the HDDs 105a to 105c by using an SSD (Solid State Disk) 109, thereby guaranteeing data to be written to the HDDs 105a to 105c. It has a function to do. As a result, the risk of data loss (data volatilization / disappearance / loss) due to a power failure or the like is suppressed, and the write cache (write cache) function of HDDs (Hard Disk Drives) 105a to 105c constituting the disk array 105 is provided. As a result, the performance of the entire server 10 is improved.

  Here, the HDDs 105a to 105c and the disk array controller 103 have cache memories 105a1 to 105c1 and a cache memory 103a, respectively. The main purpose of using the journal function using the SSD 109 in the present embodiment is to enable the write cache function using the cache memories 105a1 to 105c1 included in the HDDs 105a to 105c, thereby enabling high speed and data safety (reliability). It is to improve.

  The server 10 uses the disk array controller 103 to connect the HDDs 105a to 105c, and to build the disk array 105 by providing redundancy to the data to be recorded. As described above, the disk array controller 103 and the HDDs 105a to 105c are equipped with the cache memory 103a and the cache memories 105a1 to 105c1 used for cache control, respectively.

  In the unlikely event that a power failure occurs, there is a possibility of data loss, so the battery backup unit 107 is connected to the cache memory 103a of the disk array controller 103. As a result, even if a power failure occurs, power can be supplied from the battery backup unit 107 and the data on the cache memory 103a can be kept, and the reliability can be improved.

  On the other hand, since the HDDs 105a to 105c connected to the disk array controller 103 are often controlled to be closed in the apparatus, there is usually no means for battery backup of the cache memories 105a1 to 105c1. Therefore, when a sudden power failure occurs, there is a risk that the write data on the cache memories 105a1 to 105c1 may be lost (volatilized).

  Therefore, as one method for avoiding the risk of power failure and performing data maintenance, it is conceivable to operate the write cache function of the HDDs 105a to 105c as disabled.

  It should be noted that here, during the read processing of the HDDs 105a to 105c, even if a power failure occurs and the data on the cache memories 105a1 to 105c1 is volatilized (lost), the data is recorded in the HDDs 105a to 105c. If the data is read again, the data can be acquired again (there is no volatilization). Therefore, the read cache function of the HDDs 105a to 105c can be operated as enabled.

  In this method of disabling and operating the write cache function of the HDDs 105a to 105c, it is not possible to receive the benefit of performance improvement by so-called cache control with respect to the write performance.

  Access to the HDDs 105a to 105c includes mechanical control such as head seek control and writing to a rotating disk medium. Therefore, the access speed to the HDDs 105a to 105c is very slow compared with the arithmetic processing speed of the CPU (Central Processing Unit) of the server 10 main body, the memory access speed, the bus speed, and the like. If the write cache function of the HDDs 105a to 105c can be enabled, the time when data is placed (temporarily stored) on the cache memories 105a1 to 105c1 (which has a higher writing speed than disk writing). Thus, the HDDs 105 a to 105 c can return an access completion report to the disk array controller 103 (that is, before completing data writing to the disk medium via mechanical control). Therefore, when the write cache function is enabled in the HDDs 105a to 105c, the speed can be expected to be several to several tens of times higher than when the write cache function is disabled.

  Therefore, in the server 10 according to the present embodiment, the write cache function of the HDDs 105a to 105c is enabled to improve the writing speed, and even if a power failure occurs, write data (write data) to the HDDs 105a to 105c is received. It has a mechanism that can guarantee.

  Therefore, in the server 10, the SSD 109 is connected under the disk array controller 103. When a normal write access (write command) from the host 101 to the logical disk of the disk array 105 occurs, the write data of the write access is recorded in the SSD 109 as a journal. Data recorded in the journal is managed in units of sectors of the HDDs 105a to 105c.

  Here, the journal function is a function for recording changes to the file system in a database called a journal. When writing data to each of the HDDs 105a to 105c, the disk array controller 103 includes a journal containing data to be written to the HDDs 105a to 105c and information on sector addresses to be written on the HDDs 105a to 105c in a journal on the SSD 109. Record the data. As a result, even if data is volatilized due to a power failure or the like during data writing to the HDDs 105a to 105c, the journal on the SSD 109 is read to restore the data and the HDDs 105a to 105c to which the data should be written. It is possible to know the upper position (sector address).

  The reason for using the SSD 109 as a medium for recording a journal is as follows. Since the SSD 109 does not require mechanical control to access, for example, a disk medium, the access speed (write speed) is several hundred times better than the HDD. That is, the SSD 109 is a non-volatile storage medium that has a very small influence on the speed performance of the entire server 10 system. Considering only the speed, it is conceivable to use other non-volatile memory such as NVRAM (Non Volatile RAM), but NVRAM or the like is sufficient to record a journal of access to HDDs 105a to 105c. It is difficult to secure capacity. Therefore, in view of both speed and capacity, it is preferable to use the SSD 109 as a medium for storing the journal.

  The disk array controller 103 instructs (commands) cache flushes to the HDDs 105a to 105c constituting the disk array 105 as needed. The cache flash ensures that the write data (write data) on the cache memories 105a1 to 105c1 on the HDDs 105a to 105c is reliably written to the disk medium, so that the data can be guaranteed. Journal data can be invalidated (including erased (cleared), etc.).

That is, when the capacity of the journal data is likely to exceed the limit of the journal writing area 109a, the disk array controller 103 issues a cache flush instruction to the HDDs 105a to 105c constituting the disk array 105. If done, the journal data can be invalidated (cleared), so that the journal writing area 109a can be used from the top.
By mounting in this way, the data area to be journaled (a journal writing area 109a described later) can be suppressed to a limited size.

  When a power failure or the like occurs, the disk array controller 103 performs a recovery process of writing to the HDDs 105 a to 105 c from the journal recorded in the SSD 109. Since the data journaled in the SSD 109 cannot be guaranteed whether the writing to the disk media of the HDDs 105a to 105c has been completely performed, the data managed in units of sectors by being journaled to the SSD 109 is transferred to the HDDs 105a to 105c. Write. As a result, even if the write (write) cache function of the HDDs 105a to 105c is enabled, it is possible to guarantee write access (write) data.

(System configuration)
As described above, the server 10 according to the present embodiment includes the host 101, the disk array controller 103, the HDDs 105 a to 105 c constituting the disk array 105, the battery backup unit 107, and the SSD 109.

  The host 101 is a module such as an OS driver that is located in an upper layer of the disk array controller 103 in terms of IO (Input / Output) control. A data write (Write) command, a data read (Read) command, etc. are issued to the disk array controller 103.

  The disk array controller 103 is a control device for making the HDDs 105 a to 105 c appear to the host 101 as the disk array 105 that is one logical disk. In the present embodiment, the disk array controller 103 configures a RAID (Redundant Arrays of Independent Disks) in the HDDs 105 a to 105 c as the disk array 105. Details of the configuration of the disk array controller 103 will be described later with reference to FIG.

  In the present embodiment, the case where the disk array 105 is configured using three disk drives of the HDDs 105a, 105b, and 105c has been described as an example. However, the present invention is not limited to this. The disk array 105 may be configured using a drive.

  The HDDs 105 a, 105 b, and 105 c are disk drives that constitute the disk array 105. Each has cache memories 105a1, 105b1, and 105c1, and these are used to provide a write cache function and a read cache function. When the write cache function is enabled, the HDDs 105a to 105c, when data is recorded on the cache memories 105a1 to 105c1 (before the writing to the built-in disk medium is completed). A write completion report is returned to the disk array controller 103.

  The battery backup unit 107 is a power supply unit that supplies backup power to the cache memory 103 a built in the disk array controller 103. Even if a failure such as the interruption of the external power supply occurs, since the battery backup unit 107 supplies power to the cache memory 103a, volatilization of data on the cache memory 103a can be prevented.

  The SSD 109 stores journals related to data to be written in the HDDs 105a to 105c. As described above, the journal written to the SSD 109 includes data to be written to the HDDs 105a to 105c and information on the sector to be written.

(Functional configuration related to write processing of disk array controller 103)
Next, a functional configuration related to a write process to the disk array 105 of the disk array controller 103 will be described with reference to FIG. FIG. 2 is a functional block diagram relating to the write processing of the disk array controller 103.

  The write control unit 201 receives a write command (write command) from the host 101 which is a module such as an OS driver located in the upper layer of the disk array controller 103 in an IO control and instructs the HDD write processing unit 203.

The HDD write processing unit 203 receives a write instruction (write command) from the write control unit 201 and writes what data to which sector address of which HDD among the HDDs 105 a to 105 c constituting the disk array 105. Is determined, and data is written to the HDDs 105a to 105c in accordance with the determined content.
The HDD write processing unit 203 also has a function of passing information instructed to write to the HDDs 105 a to 105 c to the journal writing unit 205.

  Further, the HDD write processing unit 203 has a function of receiving a write instruction to the HDDs 105a to 105c from the journal reading unit 213 together with a sector address and write data on the HDDs 105a to 105c.

  The journal writing unit 205 writes the write sector address and the data to be written to the sector in the SSD 109 as a journal corresponding to the data that the HDD write processing unit 203 writes to the HDDs 105a to 105c.

  In the journal pointer control 07, a journal pointer 301 (described later) indicating how much journal data is valid for the journal write area 109a on the SSD 109 is managed. In other words, in the journal pointer control 07, the journal writing unit 205 manages a place where journal data should be newly written.

  The flash control unit 211 issues a cache flush command to the HDDs 105a to 105c periodically or when the journal writing area 109a on the SSD 109 is depleted and there is no new writing area. When receiving the cache flush command, the HDDs 105a to 105c write all the write data (write data) on the cache memories 105a1 to 105c1 to the disk medium and clear the data on the cache memories 105a1 to 105c1.

  The journal reading unit 213 takes out the written sector address and write data from the valid journal data indicated by the journal pointer control 207 in the journal writing area 109 a on the SSD 109 and passes it to the write control unit 201.

(Journal management method)
Next, a journal management method on the SSD 109 will be described with reference to FIG. FIG. 3 is a diagram for explaining a management method of the journal writing area 109 a secured on the SSD 109.

  The journal writing area 109a is an area secured on the SSD 109, and information such as write data (write data) written to the HDDs 105a to 105c is written as a journal.

  The journal pointer 301 is a pointer indicating a position (location) where journal data is to be newly written next. The journal pointer 301 is initialized to indicate the head of the journal writing area 109a by an initialization process performed when the disk array controller 103 starts operation. Thereafter, when one journal data is written by the journal writing unit 205, the journal pointer control unit 207 advances the journal pointer 301 by the size of the journal data. Next, when the journal writing unit 205 writes journal data, the journal data is written from the address currently pointed to by the journal pointer 301, and after the writing, the journal pointer control unit 207 re-establishes only the size of the journal data. The journal pointer 301 is advanced.

  In this way, each time the journal data is written, the journal pointer 301 is advanced by that size, so that the journal pointer 301 always points to the position where the next journal data is to be written. That is, the data between the beginning of the journal writing area 109a and the position indicated by the journal pointer 301 is valid journal data.

  When the cache controller 211 issues a cache flush command to the HDDs 105a to 105c and all the cache data on the cache memories 105a1 to 105c1 is written to the disk medium, write access from the write controller 201 until then is completed. It can be assured that all of the generated write data is recorded on the nonvolatile disk medium included in the HDDs 105a to 105c. Therefore, since all the journal data recorded before the cache flush command is issued becomes unnecessary, when the processing for the cache flush command is completed, the journal pointer control unit 207 sets the start of the journal write area 109a to the journal. Initialization is performed as indicated by the pointer 301. As a result, all journal data written on the journal writing area 109a is invalidated.

The number of journal write areas 109a described above is prepared corresponding to the number of disk drives connected to the disk array controller 103 (three in this embodiment, corresponding to the HDDs 105a to 105c).
That is, the journal writing unit 205 manages a journal for each of the HDDs 105a to 105c.

(Processing flow when writing data)
With reference to FIG. 4, the flow of processing at the time of data writing by the disk array controller 103 according to the present embodiment will be described. FIG. 4 is a flowchart showing a processing flow of the disk array controller 103 related to writing.

  When a write command (command) for the disk array controller 103 is generated from the host 101, which is a higher-level software module such as an OS driver, the write control unit 201 receives the write command (S401). The write control unit 201 passes the write command to the HDD write processing unit 203.

  The HDD write processing unit 203 analyzes the input write command, determines which sector address of the HDDs 105 a to 105 c should be accessed, what size of data is to be written, and the HDDs 105 a to 105 constituting the disk array 105. It is determined how to divide the data for 105c, etc., and parity data is generated as necessary. As a result, the HDD write processing unit 203 determines what data is to be written in which sector of which disk drive among the HDDs 105a to 105c, and actually writes data to the disk drive (write command ( (Instruction) is issued) (S403).

  Next, the HDD write processing unit 203 writes the same information as the write command (instruction) performed in S403, that is, the sector address as the data write destination of the HDDs 105a to 105c and the data to be written in the journal writing. The data is transferred to the loading unit 205 and the writing of the journal is instructed. The journal writing unit 205 receives the journal writing instruction, and the data to be written on the HDDs 105a to 105c at the position on the journal writing area 109a indicated by the journal pointer 301 indicating the place where the latest journal data should be written. Is recorded as journal data (S405).

  Then, the journal pointer control unit 207 advances (updates) the journal pointer 301 by the size of one journal data in preparation for writing the next journal data (S407).

  The journal pointer control unit 207 verifies whether or not the position indicated by the updated journal pointer 301 exceeds the overall size of the journal writing area 109a (end position of the journal writing area 109a) (S409). If the position indicated by the journal pointer 301 is within the journal writing area (No in S409), the disk array controller 103 finishes the journal data writing process.

  On the other hand, when the position indicated by the journal pointer 301 is the same as the end (last) of the journal writing area 109a or exceeds the area (out of the area) (Yes in S409), the HDDs 1105a to If a write access to 105c occurs and data to be journaled is derived, no more journal data can be written.

  Therefore, the journal pointer control unit 207 issues a cache flush command to the HDDs 105a to 105c by the flash control unit 211, whereby the write data in the cache memories 105a1 to 105c1 is transferred to the HDDs 105a to 105c. Write to the disk medium (S411).

  Here, in the determination (verification / determination) in S409, even if the position indicated by the updated journal pointer 301 does not exceed the writing area of the journal writing area 109a, one journal data is stored next. If the writing exceeds the journal writing area 109a, S409 is determined as Yes (exceeding the journal writing area 109a).

  When the cache flush process by the HDDs 105a to 105c is completed, it can be considered that all the data that have been written (written) access until then are written to the disk media of the HDDs 105a to 105c. Therefore, when the cache flush process is completed, the journal pointer control unit 207 initializes the journal pointer 301 to point to the head of the journal writing area 109a (S413). As a result, all the journal data in the journal writing area 109a is invalidated, and when the next write access to the HDDs 105a to 105c occurs and the data to be journaled in the SSD 109 is generated, the journal writing area 109a again. You will be able to write from the beginning.

  Further, the processing of S411 and S413 is performed not only when the journal writing area 109a is exhausted as in this flowchart, but also periodically before the journal writing area 109a is exhausted to initialize the journal pointer 301. May be.

  As described above, when write access to the HDDs 105a to 105c occurs, the disk array controller 103 performs the processing of S601 to S605, and executes S606 and S607 as necessary, so that any sector address of the HDDs 105a to 105c is obtained. It is possible to leave a journal on the SSD 109 as to what kind of data has been written. Since the SSD 109 is a non-volatile storage medium, even if a power failure or the like occurs, the journal does not volatilize.

(Process flow for data recovery)
With reference to FIG. 5, the flow of processing at the time of data recovery of the disk array controller 103 according to the present embodiment will be described. FIG. 5 is a flowchart showing a processing flow of the disk array controller 103 related to data recovery.

  When a sudden power failure or the like occurs, power supply to the cache memories 105a1 to 105c1 of the HDDs 105a to 105c is interrupted, and data temporarily stored in the memories is volatilized (lost / erased). . This data cannot be guaranteed by the HDDs 105a to 105c alone.

  When the system of the server 10 is operated with the write cache function of the HDDs 105a to 105c enabled, the HDDs 105a to 105c receive the write command (write command) from the disk array controller 103. When the write data of the write command is stored in the cache memories 105 a 1 to 105 c 1, the HDDs 105 a to 105 c return a write process completion response to the disk array controller 103. At this time, the write data for the write command is actually not written to the disk media in the HDDs 105a to 105c. The disk array controller 103 does not have a means for determining when the write data on the HDDs 105a to 105c has been written to the disk medium or not.

Therefore, the disk array controller 103 recovers the write data using the data journaled in the SSD 109.
First, when the disk array controller 103 recovers from the power shutdown, it calls the journal reading unit 213 to recover the write data (S501).

  The journal reading unit 213 places the journal data reading position at the head of the journal writing area 109a in order to read the journal data recorded in the journal writing area 109a one by one (S503).

  Then, the journal reading unit 213 reads one journal data (sector address information and write data of the HDDs 105a to 105c) from the journal data reading position, and passes it to the HDD write processing unit 203 (S505).

  The HDD write processing unit 203 writes the write data at the sector address positions on the HDDs 105a to 105c based on the received journal data (S507). Then, the journal reading unit 213 advances the reading position of the journal data by one journal data (S509).

  Thereafter, the updated journal data reading position is compared with the position indicated by the journal pointer 301 (S511). As a result of this comparison, if the two match (or the position of the read pointer exceeds the position indicated by the journal pointer 301) (Yes in S511), it is determined that there is no more effective journal data. Therefore, the disk array controller 103 ends the process. As a result of the comparison in S511, if the read position of the journal data is before the position indicated by the journal pointer 301 (No in S511), the disk array controller 103 returns to S505 again to process the next journal data. .

  The disk array controller 103 repeats the processing from S505 to S509, reads all valid journal data, and writes the data to the HDDs 105a to 105c, so that the cache memory 105a1 of the HDDs 105a to 105c is instantly generated when a power failure occurs. All of the write data recorded in through 105c1 can be written on the disk media of the HDDs 105a through 105c.

(Effect of this embodiment)
In the server 10 according to the present embodiment, even if the write cache function of the HDDs 105a to 105c connected to the disk array controller 103 is enabled and operated, it is recorded on the cache memories 105a1 to 105c1 of the HDDs 105a to 105c. The written data is also recorded on the SSD 109 as journal data. As a result, even if the write data on the cache memories 105a1 to 105c1 cannot be guaranteed due to a sudden power failure, the write data can be recovered from the journal data on the SSD 109. That is, even when the write cache function of the HDDs 105a to 105c is enabled, the system can be operated safely.

  If the write cache function of the HDDs 105a to 105c is enabled and operated, the write data is sent from the disk array controller 103 in response to the write command from the disk array controller 103, and the caches of the HDDs 105a to 105c are cached. The HDDs 105a to 105c can return a response indicating the completion of writing to the disk array controller 103 at the time when they are stored on the memories 105a1 to 105c1. That is, a response to the write command can be returned without performing a mechanical operation such as seek / positioning of the head accompanying the disk access of the HDDs 105a to 105c or waiting for the rotation of the disk. Compared with the case where the cache function is invalidated), it is possible to improve the writing speed several times to several tens of times.

(Additional notes)
Note that the configurations of the above-described embodiments may be combined or some of the components may be replaced. The configuration of the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the scope of the present invention.
A part or all of each of the above-described embodiments can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
One or more nonvolatile first storage devices, a nonvolatile second storage device that can be written at higher speed than the first storage device, and a first data writing device that writes data to the first storage device A second writing unit that stores in the second storage device, writing means, data to be written to each of the one or more first storage devices, and sector information of the first storage device to which the data is written; And an invalidating means for invalidating the corresponding data stored in the second storage device after the written data becomes non-volatile on the first storage device.

(Appendix 2)
Read means for reading data and sector information from the second storage device is further provided, and the first write means is read from the second storage device by the read means upon recovery from a power failure. The information processing apparatus according to appendix 1, wherein the data is written at a position on the first storage device according to sector information.

(Appendix 3)
The second storage device further includes means for controlling position information for indicating valid data and an area of sector information, and the reading means is configured to read data and sector information based on the position information. The information processing apparatus according to appendix 2, wherein:

(Appendix 4)
Any one of appendix 1 to appendix 3, further comprising means for issuing a command for making the written data non-volatile on the first storage device to one or more first storage devices The information processing apparatus described.

(Appendix 5)
The information processing apparatus according to any one of appendix 1 to appendix 4, wherein the second storage device is an SSD (Solid State Drive).

(Appendix 6)
The information processing apparatus according to any one of appendix 1 to appendix 5, wherein the cache function included in each of the first storage devices is effective.

(Appendix 7)
First writing means for writing data to the one or more nonvolatile first storage devices, data to be written to each of the one or more first storage devices, and the first to write the data Second writing means for storing the sector information of the storage device in the second storage device, which can be written at a higher speed than the first storage device, and the non-volatile storage device; A control device comprising: invalidating means for invalidating corresponding data stored in the second storage device after becoming non-volatile on the storage device.

(Appendix 8)
A step of writing data to the one or more nonvolatile first storage devices; data to be written to each of the one or more first storage devices; and sector information of the first storage device to which the data is written Are stored in the second storage device that is writable at a higher speed than the first storage device, and the written data becomes nonvolatile on the first storage device, And invalidating corresponding data stored in the second storage device.

  DESCRIPTION OF SYMBOLS 10 ... Server, 101 ... Host, 103 ... Disk array controller, 105 ... Disk array, 105a, 105b, 105c ... HDD, 109 ... SSD, 203 ... HDD write system Processing unit 205 ... Journal writing unit 213 ... Journal reading unit

Claims (8)

One or more nonvolatile first storage devices;
A non-volatile second storage device writable at a higher speed than the first storage device;
First writing means for writing data to the first storage device;
Second writing means for storing, in the second storage device, data to be written to each of the one or more first storage devices, and sector information of the first storage device to which the data is written;
An information processing apparatus comprising: invalidating means for invalidating corresponding data stored in the second storage device after the written data becomes non-volatile on the first storage device. A read unit for reading data and sector information from the second storage device;
The first writing means writes the data read from the second storage device by the reading means at a position on the first storage device according to sector information when returning from a power failure. ,
The information processing apparatus according to claim 1. Means for controlling position information for indicating valid data and sector information areas stored in the second storage device;
The reading means determines data to be read and sector information based on the position information.
The information processing apparatus according to claim 2. 4. The apparatus according to claim 1, further comprising a unit that issues a command for making the written data non-volatile on the first storage device to one or more of the first storage devices. 5. 1. An information processing apparatus according to item 1. The second storage device is an SSD (Solid State Drive).
The information processing apparatus according to any one of claims 1 to 4. The cache function of each of the first storage devices is effective.
The information processing apparatus according to any one of claims 1 to 5. First writing means for writing data to the one or more non-volatile first storage devices;
The data to be written to each of the one or more first storage devices and the sector information of the first storage device to which the data is written can be written at higher speed than the first storage device, and the nonvolatile information Second writing means for storing in a second storage device;
A control device comprising: invalidating means for invalidating corresponding data stored in the second storage device after the written data becomes non-volatile on the first storage device. Writing data into the one or more non-volatile first storage devices;
The data to be written to each of the one or more first storage devices and the sector information of the first storage device to which the data is written can be written at higher speed than the first storage device, and the nonvolatile information Storing in a second storage device;
And a step of invalidating the corresponding data stored in the second storage device after the written data becomes non-volatile on the first storage device.