HP 418800-B21 HP StorageWorks Replication Solutions Manager 4.0.1 user guide ( - Page 104

Job commands CreateDrGroup CreateDrGroupFromHostVolume ForceFullCopyDrGroup SetDrGroupAutoSuspend SetDrGroupFailsafeOnLinkdownPowerup PresentStorageVolume Remarks These arguments are ignored if the feature is not available. AutoSuspend On Link Down Destination RAID level Source Log Disk Group Destination Log Disk Group Maximum Log Disk Size This job command is ignored if the feature is not available. This job command is ignored if the feature is not available. This job command is ignored if the feature is not available. When a virtual disk is a remote copy, the argument Access Type = None (No read) is ignored if the feature is not available. Logs Log overview and states A DR group log is a designated virtual disk that stores the host data that is written to the virtual disks in a source DR group. The contents of the log are replicated to the destination virtual disks to synchronize them with their sources. The process of storing host data, in the exact order received in the DR group, is called logging. The process of replicating the logged data to the destination DR group, in the same order as received, and synchronizing with the sources is called merging or DR group normalization. See logging, merging and DR group normalization. When a DR group log becomes full, a full copy is automatically initiated. See full copy mode and log size. Log states The DR group log states depend upon the write mode, as shown below. Replication write mode Enhanced asynchronous Standard asynchronous Synchronous Log states • Normal. All source disks in the DR group are continuously logging and merging. • Running down. All source disks in the DR are merging as the result of a requested transition to synchronous mode. See write mode transitions. • Not in use. No source virtual disk in the DR group is logging or merging. • Logging. At least one source virtual disk in the DR group is logging but none are merging. • Merging. At least one source virtual disk in the DR group is merging. • Not in use. No source virtual disk in the DR group is logging or merging. • Logging. At least one source virtual disk in the DR group is logging but none are merging. • Merging. At least one source virtual disk in the DR group is merging. 104 DR Groups