HP 418800-B21 HP StorageWorks Replication Solutions Manager 4.0.1 user guide ( - Page 102

• When any virtual disk in the DR group pair becomes unavailable, host writes, logging, and remote replication are stopped. • Disabled • While all components in the DR group pair function normally, host writes, logging, and remote replication continue normally. • If any remote copy (virtual disk) in the DR group pair becomes unavailable, all host writes to the source DR group and logging continue, but remote replication to the destination DR group is automatically stoped. Host writes are stored in the source DR group log until remote replication is re-established. • If a source virtual disk becomes unavailable, host writes to the virtual disk are automatically stopped. Remote replication to the remote copy is also automatically stopped. Host writes, logging, and remote replication to other virtual disks in the source and destination DR groups continue normally. Default setting and user control When you create a DR group pair, you can choose to initially enable or disable the feature. The setting can be changed after the DR group pair is created. In some older versions of storage management software, failsafe on unavailable member is called failsafe mode. See also failsafe states, remote replication guidelines and failsafe on link-down/power-up. Failsafe states The failsafe state for a DR group pair indicates the state of host I/O, logging, and remote replication functions. Values are: • Locked. A locked failsafe state for a DR group pair indicates that host writes, logging, and remote replication have been automatically stopped due to a problem. • Unlocked. An unlocked failsafe state for a DR group pair indicates that host writes, logging, and remote replication are occurring normally. Failsafe states are related to settings for failsafe on link-down/power-up and failsafe on unavailable member. Full copy mode Full copy mode is when data in a DR group pair is copied directly from the source group virtual disk to the destination group, without using any data in the log disk. Typically, this is an automatic event that happens when remote replication is resumed and the DR group log disk is full. See default maximum log size. Force full copy In a forced full copy: • All virtual disks in the source DR group are copied; you cannot copy individual disks. • All host write-transactions in the DR group log are deleted. Even when supported by the controller software, the force full copy feature is not available if conditions in the DR group pair are not appropriate. Controller software versions Implementation of this feature is controller software dependent. See controller software features - remote replication. Home When designated as home, the DR group is the preferred source in the DR group pair. Values are: 102 DR Groups