HP 3PAR StoreServ 7450 4-node HP 3PAR CIM API Programming Reference (OS 3.1.2 - Page 103
CIM Classes, TPD_ReplicationGroup
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2. SyncType - describes the replication policy supported by this profile. There are three defined types: a. Clone - Creates a point-in-time, independent, copy of the source element. b. Mirror - Creates and maintains a synchronized mirror copy of the source. Writes done to the source element are reflected to the target element. The target element remains dependent on the source element. c. Snapshot - Creates a point-in-time, virtual image of the source element. The target element remains dependent on the source element. Snapshots are commonly known as delta replicas and contain incrementally changed data as well as references (e.g. pointers) to the unchanged source element data. 3. Mode - controls when the write operations are performed. There are 2 defined modes: a. Synchronous - The writer waits until the write operations are committed to both the source and target elements; or to both the source element and a target related entity, such as pointer tables. b. Asynchronous - The writer waits until the write operations are committed to the source elements only. In this mode, there can be a delay before the write operations are committed to the target elements. 4. Locality - specifies the relationship between the source and target element. There are two defined localities: a. Local - indicates the source and target elements are contained in a single managed system. b. Remote - indicates the source and target elements are contained in separate managed systems. In this case, the service must rely on a networking protocol for the copy operations. HP 3PAR SMI-S supports read-only implementation of remote replication. SMI-S terminologies can be mapped to HP terminologies. Table 90 SMI-S/HP Terminology Map Type of HP Copy Physical copy Sync Type Clone Clone Mode Synchronous Locality Local Asynchronous Local Virtual copy Snapshot Remote copy, with synchronous mode volume groups Remote copy, with asynchronous periodic mode volume groups Mirror Mirror Synchronous Local Synchronous Asynchronous Remote Remote Note Independent clone is created which will then detach automatically Clone is created and does not detach; target is synchronized only manually Target sv contains synchronously updated delta of the source volume Read-only supported Read-only supported CIM Classes TPD_ReplicationGroup TPD_ReplicationGroup is a volume set that can be used for local clones or snapshots. Replication Services Profile 103