2.4.2 Inheriting a shared disk
HA Monitor performs handover of a shared disk by using LVM or HA Booster, or by using a disk or partition for which LVM is not used. While the shared disk is being used by the active server, HA Monitor applies a logical lock to the shared disk so that it cannot be accessed from the standby server.
- When using LVM:
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The shared disk is handed over in units of volume groups. LVM controls the connection between HA Monitor and the shared disk.
- When using HA Booster:
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Using HA Booster enables faster handover of the shared disk. In this case, HA Booster controls access to the shared disk. HA Booster uses a lock to control handover of the shared disk on a control group basis, rather than a volume group basis. Faster inheritance of the shared disk is achieved by using HA Booster because intervention by LVM does not occur. For control groups, register disk devices.
For details about faster handover of a shared disk by using HA Booster, see the documents related to HA Booster.
- When using a disk or partition that does not use LVM:
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This method allows the shared disk to be inherited by using a disk for which LVM is not used or by using a file system directly created in a partition. The connection between HA Monitor and the shared disk is controlled by mounting and unmounting a file system. Note that HA Monitor does not control character special files (raw devices). Therefore, to use character special files, consider using another means such as using user commands.