| PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.1 (Linux) |
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| Chapter 1 Function | > 1.5 Proxy Volume |
For example, if a misoperation damages master volume data, you can still restore the master volume data using the proxy volume.
In this case, JRM (Just Resynchronization Mechanism) provides high-speed resynchronization by copying only portions that were updated while the master and proxy volumes were being separated. You can resume the service application immediately without waiting for the completion of the copying process. Synchronization copying process will take place in parallel with other tasks.
Users may use this function with any disk unit, as it is not dependent on a specific function of a disk unit.
For example, in a situation where loads imposed on disks are higher during the day than at night, if saving data to tape takes no more than 5 hours and resynchronization copying no more than an hour, the routine backup schedule that enables instant restore from disks (proxy volumes) but not always from tape is assumed as follows.
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