JP2013200708A - Cache device, method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cache device including a plurality of caches, in which when an abnormality of a cache itself is detected, quick charge of a battery as a standby power source of the cache is interrupted, and quick charge of another cache is never started.SOLUTION: A cache device includes a plurality of data control means; and each of the data control means has data management means containing a cache, and a battery as a standby power source of data management means in the same data control means. The data management means monitors charging states of all batteries in the cache device and an abnormality of the data management means; and interrupts, when an abnormality is detected in the data management means in the data control means whose battery is being quickly charged, charging of a battery in the data management means, in which the abnormality is detected, so as to quickly charge a battery of its own data control means.

Description

  The present invention relates to a cache device, a method, and a program.

  Patent Document 1 includes two power supply units (first power supply unit and second power supply unit) each having a backup battery, and a first device and a second device connected to each of the power supply units. In a redundant system, a backup device that drives only one of the first device and the second device with a normal battery when a battery fails is described.

  Patent Document 2 describes a display device that maintains a total charging current so as not to exceed a current capacity and rapidly charges a driving current of a display only when necessary.

  Patent Document 3 describes a pulse charger that reduces power consumption by preventing the timings of a plurality of pulse waveforms from overlapping each other.

JP 2006-163455 A Hei 2-281289 JP-A-8-237877

  Even when the technique of the above-mentioned document is used, when a cache device including a plurality of caches detects an abnormality of the cache itself, the quick charge of the battery that is a standby power source of the cache is interrupted, and the battery of another cache The quick charge of will never start.

  Patent Document 1 describes a backup method when the battery itself fails in the redundant system, but does not describe the case where the apparatus main body fails.

  Patent Document 2 only describes a method for maintaining the sum of charging currents.

  Patent Document 3 only describes a method of reducing power consumption by adjusting output waveforms of a plurality of chargers.

  The cache device according to the present invention is a cache device including a plurality of data control means, and each of the data control means includes a data management means including a cache and the data management means in the same data control means. The data control means includes a battery that is a reserve power supply for the battery, and the data management means monitors the state of charge of all the batteries in the cache device and abnormality of the data management means, and rapidly charges the battery. When the abnormality of the data management means is detected, charging of the battery in the data control means in which the abnormality is detected is interrupted, and the battery of the own data control means is rapidly charged.

  The method according to the present invention includes a data management unit including a cache and a data control unit including a battery as a backup power source for the data management unit. When the abnormality of the data management means in the data control means that monitors the state of charge of the battery and the data management means is monitored and the battery is rapidly charged, the abnormality is detected in the data control means The charging of the battery is interrupted and the battery of its own data control means is rapidly charged.

  A computer program according to the present invention is a process for monitoring a charging state of all the batteries in a cache device including a plurality of data control means including a computer including a cache and a battery as a backup power source of the computer, and abnormality of the computer And detecting an abnormality of the computer in the data control means that is rapidly charging the battery, interrupting charging of the battery in the data control means in which the abnormality is detected, And causing the computer to execute a process of rapidly charging the battery.

  According to the present invention, it is possible to efficiently carry out rapid charging including not only battery abnormality but also cache abnormality.

FIG. 1 shows an example of the configuration of a cache device. FIG. 2 shows an example of the operation when the cache device is activated. FIG. 3 shows an example of the operation during normal operation of the cache device. FIG. 4 shows an example of the operation when an abnormality occurs in the data management unit of the cache device. FIG. 5 is a flowchart showing the operation of the data management unit during normal operation. FIG. 6 is a flowchart showing the operation of the data management unit when an abnormality occurs. FIG. 7 shows an example of the configuration of the cache device according to the second embodiment.

  A first embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of the configuration of the cache device 10.

  The cache device 10 includes a plurality of data control units 20 having the same configuration, so that even if one data control unit 20 cannot operate due to a failure, the other data control units 20 continue to operate. Operation as a device can be continued.

  In FIG. 1, a description will be given by taking as an example a configuration including two data control units 20, that is, a data control unit 20-A and a data control unit 20-B.

  The cache device 10 includes a data control unit 20-A, a data control unit 20-B, a normal power supply 30-A, and a normal power supply 30-B.

  The cache device 10 is connected to one or more host computers and one or more storage devices 40. The storage device 40 is, for example, a magnetic disk device.

  The data control unit 20 includes a data management unit 21 and a battery control unit 22.

  The data management unit 21 is communicatively connected to another data management unit 21 in the cache device 10. In addition, the data management unit 21 is connected not only to the battery control unit 22 in the same data control unit 20 but also to the battery control unit 22 in another data control unit 20.

  The data management unit 21 functions as a cache memory of the storage device 40 for the host computer.

  The cache 210 temporarily stores data in the storage device 40. The data management unit 21 includes a cache 210 and manages input / output of data in the cache 210.

  The battery control unit 22 manages the state of the battery 220 and includes the battery 220. Further, the battery control unit 22 is in communication connection with the battery control unit 22 in the other data control unit 20.

  The data management unit 21 is normally supplied with power from, for example, an AC power supply from the normal power supply 30 and includes a battery control unit 22 for backup.

  Here, the cache 210 is constituted by a semiconductor memory or the like. The data management unit 21 and the battery control unit 22 are configured by hardware such as a logic circuit. The battery 220 is composed of a rechargeable battery or the like.

  The data management unit 21 and the battery control unit 22 may be realized by a processor of the data management unit 21 that is a computer executing a program on a memory (not shown).

  FIG. 2 shows an example of the operation when the cache device 10 is activated.

  Here, a possible state of the battery 220 will be described.

  The battery 220 has three states: fast charge, slow charge, and inhibition / maintenance.

  The quick charge and the low speed charge are states in which the battery 220 is being charged. For example, a reference value indicating a charge speed is set, and the charge state at a speed exceeding the reference value is a fast charge or less. The state of charge at speed is slow charge. Inhibition / maintenance is a state in which the battery 220 is not charging.

  Note that, after the battery 220 is completely charged by the above-described rapid charging or low-speed charging, the charging rate decreases with the passage of time due to power supply to the supply data management unit 21 or natural decrease. For this reason, the battery 220 needs to be appropriately charged.

  With reference to FIG. 2, a charging method at the time of activation of the cache device 10 will be described using configurations of the data control unit 20 -A and the data control unit 20 -B.

  In the following drawings, “rapid” means quick charging, and “low speed” means low speed charging.

  “Inhibition” is in the state of inhibition / maintenance, but “inhibition” is described in order to emphasize that it is a stage of an operation to stop charging.

  In addition, “maintenance” is a state of deterrence / maintenance, but “maintenance” is emphasized to emphasize that time has elapsed after “inhibition” and the state where charging is not performed continues. It is described.

  Note that rapid charging is performed by only one data management unit 21 in consideration of power consumption.

  First, as shown to Fig.2 (a), the battery control part 22 starts first. This is because the battery 220 must be operating when the data control unit 20 is started.

  Here, the battery control unit 22-A communicates with the battery control unit 22-B and confirms whether they can operate normally. When the confirmation is completed, first, for example, the battery 220-A starts rapid charging. Here, the quick charging is performed because charging of at least one battery needs to be completed.

  Next, as shown in FIG. 2B, the data management unit 21 is started. The data management unit 21 can communicate with the other data management units 21 in the cache device 10 and all the battery control units 22.

  The battery control unit 22 continues to charge the battery control unit 22 after receiving the notification that the start is completed from the data management unit 21.

  Further, FIG. 2C shows a state in which the rapid charging of the battery 220-A is completed, the rapid charging of the battery 220-A is suppressed, and the rapid charging of the battery 220-B is started.

  FIG. 3 shows an example of the operation of the cache device 10 during normal operation.

  The normal operation of the cache device 10 will be described using the configuration of the data control unit 20-A and the data control unit 20-B as an example with reference to FIG.

  First, as shown to Fig.3 (a), the case where the battery control part 22-B detects the charge rate fall of own battery 220-B during operation is assumed. At this time, both the battery 220-A and the battery 220-B are in the “maintained” state.

  Next, as illustrated in FIG. 3B, the battery control unit 22 -B receives a decrease in the charging rate of the battery 220 -B, and starts rapid charging of its own battery 220 -B.

  Moreover, as shown in FIG.3 (c), battery control part 22-B suppresses rapid charge, when charge of battery 220-B is completed.

  Note that the operation of the battery control unit 22-B in the above may be replaced by the data management unit 21-B.

  FIG. 4 shows an example of the operation when an abnormality occurs in the data management unit 21 of the cache device 10.

  With reference to FIG. 4, the operation when the data management unit 21 -A fails will be described using the configuration of the data control unit 20 -A and the data control unit 20 -B as an example.

  FIG. 4A shows a case where the data management unit 21-A fails when the battery 220-A is rapidly charged. The data management unit 21-B monitors the abnormality of the state of the data management unit 21-A and also monitors the charging state of the battery control unit 22-A and the battery control unit 22-B. The data management unit 21-B detects the failure of the data management unit 21-A and the fact that the battery 220-A in the battery control unit 22-A is being rapidly charged by the above monitoring.

  As described above, when one data management unit 21 fails, it is meaningless even if the battery 220 of the failed data management unit 21 continues the rapid charge. The battery 220 of the unit 21 switches to quick charging.

  FIG. 4B shows this state. In response to a command from the data management unit 21-B, the battery 220-A on the side of the data management unit 21-A in which a failure has occurred is prevented from rapid charging, and the other battery 220-B starts rapid charging.

  FIG. 5 is a flowchart showing the operation of the data management unit 21 during normal operation.

  Note that FIG. 5 illustrates a configuration in which the cache device 10 includes the data control unit 20-A and the data control unit 20-B. For example, paying attention to one data management unit 21-A, the battery 220-A is “ A description will be given of an operation in which the “own battery” and the battery 220-B are expressed as “matter battery” and the data management unit 21-A rapidly charges the “own battery”.

  First, the data management unit 21-A confirms whether the “partner battery” is rapidly charged (S11).

  Next, when the “partner battery” is rapidly charged (Y in S11), the data management unit 21-A determines whether the “partner battery” is completely charged or the “partner battery” fails. Wait (N in S12).

  When the waiting is completed (Y in S12), it is confirmed whether the “own battery” is sufficiently charged (S13).

  When the “own battery” is not sufficiently charged (N in S13), the data management unit 21-A quickly charges the “self battery” (S14).

  Thereafter, the data management unit 21-A checks whether or not the charging of the “own battery” is completed (S15), and when the charging is completed, the rapid charge of the “own battery” is suppressed (S16).

  In the case of (N in S11) or (Y in S13), the process returns to (S11) and continues to monitor the partner battery.

  FIG. 6 is a flowchart illustrating an operation of the data management unit 21-B when an abnormality occurs in the data management unit 21-A and is detected by monitoring of the data management unit 21-A.

  FIG. 6 shows a configuration of the data control unit 20-A and the data control unit 20-B. For example, paying attention to one data management unit 21-B, the battery 220-B is replaced with “own battery”, the battery 220- The operation in which A is expressed as “a partner battery” and the data management unit 21-B rapidly charges the “own battery” will be described.

  First, the data management unit 21-B confirms whether the “partner battery” is rapidly charged (S21).

  When the “partner battery” is rapidly charged (Y in S21), the data management unit 21-B interrupts the charging of the “partner battery” (S22).

  Next, the data management unit 21-B checks whether or not the “own battery” is sufficiently charged (S23).

  When the “own battery” is not sufficiently charged (N in S23), the data management unit 21-B rapidly charges the “own battery” (S24).

  Thereafter, the data management unit 21-B confirms whether or not the charging of the “own battery” is completed (S25), and when the charging is completed, suppresses the rapid charging of the “own battery” (S26).

  In the case of (N in S21) or (Y in S23), the process returns to (S21) and continues to monitor the partner battery.

  In the above description, the “fully charged state” means a state in which the amount of electricity used or discharged after rapid or low-speed charging is below a predetermined ratio.

  In the present embodiment, the configuration in which the data management unit 21 and the battery control unit 22 are physically separated has been described. However, the data management unit 21 and the battery control unit 22 may be housed in the same configuration. Good.

  The cache device 10 according to the present embodiment has the following effects.

  The charging of the battery 220 in the data control unit 20 in which the abnormality is detected is interrupted, and the battery 220 of the own data control unit 20 is rapidly charged.

The reason is that the data management unit 21 monitors the charging state of all the batteries 220 in the cache device 10 and the abnormality of the data management unit 21.
<Second Embodiment>
FIG. 7 shows an example of the configuration of the cache device 10 according to the second embodiment.

  The cache device 10 includes a plurality of data control units 20.

  FIG. 7 illustrates an example in which the cache device 10 includes, for example, a data control unit 20-A and a data control unit 20-B.

  The data control unit 20 includes a data management unit 21 that includes a cache 210, and a battery control unit 22 that includes a battery 220 that is a backup power source for the data management unit 21.

  The data management unit 21 monitors the state of charge of the battery 220 and the abnormality of the data management unit 21.

  When the data management unit 21 detects an abnormality in the data management unit 21 in the data control unit 20 that is rapidly charging the battery 220, the data management unit 21 interrupts the charging of the battery 220 in the data control unit 20 in which the abnormality is detected, The battery 220 of the own data control unit 20 is rapidly charged.

  The cache device 10 according to the present embodiment has the following effects.

  The charging of the battery 220 in the data control unit 20 in which the abnormality is detected is interrupted, and the battery 220 of the own data control unit 20 is rapidly charged.

  The reason is that the data management unit 21 monitors the charging state of all the batteries 220 in the cache device 10 and the abnormality of the data management unit 21.

  Note that the data control unit 20 included in the cache device 10 may be three or more.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Cache apparatus 20 Data control part 21 Data management part 210 Cache 22 Battery control part 220 Battery 30 Normal power supply 40 Storage device

Claims (9)

A cache device comprising a plurality of data control means,
Each of the data control means includes a battery that is a backup power source of the data management means in the same data control means as the data management means including a cache,
The data management means monitors the state of charge of all the batteries in the cache device and abnormality of the data management means,
Upon detecting an abnormality in the data management means in the data control means that is rapidly charging the battery, the charging of the battery in the data control means in which an abnormality is detected is interrupted, and the data control means A cache device that quickly charges a battery. The plurality of data control means is three or more,
A plurality of data management means other than the data control means in which an abnormality has been detected selects one according to a predetermined procedure, and only the selected one of the data management means rapidly charges the battery of its own data control means The cache device according to claim 1.   When the data management unit detects an abnormality of the battery in the data control unit that is being rapidly charged, the data management unit interrupts charging of the battery in which the abnormality is detected, and rapidly charges the battery in its own data control unit The cache device according to claim 1 or 2. The data management means in the cache device including a plurality of data management means including a cache and a data control means including a battery as a backup power source of the data management means, and the charge state of all the batteries in the cache device and Monitoring the abnormality of the data management means,
Upon detecting an abnormality in the data management means in the data control means that is rapidly charging the battery, the charging of the battery in the data control means in which an abnormality is detected is interrupted, and the data control means A method of quickly charging a battery. The plurality of data control means is three or more,
A plurality of data management means other than the data control means in which an abnormality has been detected selects one according to a predetermined procedure, and only the selected one of the data management means rapidly charges the battery of its own data control means The method of claim 4.   6. An abnormality of the battery in the data control means that is rapidly charged is detected, charging of the battery in which the abnormality is detected is interrupted, and the battery in the own data control means is rapidly charged. the method of. A process of monitoring the state of charge of all of the batteries and abnormality of the computer in a cache device including a plurality of data control means including a computer including a cache and a battery that is a backup power source of the computer;
When an abnormality of the computer in the data control means that is rapidly charging the battery is detected, charging of the battery in the data control means in which the abnormality is detected is interrupted, and the battery of the own data control means is removed. A program for executing a quick charging process. The plurality of data control means is three or more,
A plurality of the computers other than the data control unit in which an abnormality is detected selects one computer according to a predetermined procedure, and only the selected one computer rapidly charges the battery of its own data control unit. 8. The program according to claim 7, wherein the program is executed by the computer.   A process of detecting an abnormality of the battery in the data control means being rapidly charged, interrupting charging of the battery in which the abnormality is detected, and rapidly charging the battery in the own data control means; The program according to claim 7 or 8, which is executed by the program.

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