Host PowerTools allows to create snapshots and to perform other related operations on the host's mapped Active-Active volumes.
- The following section include information which is specific to snapshots management of Active-Active volumes.
- For more information about snapshot management through Host PowerTools see: Snapshots management.
- Snapshots are created individually on each peer.
- Snapshots cannot be replicated between the systems.
- If both peers are synchronized (the Active-Active replica state of the peers is "Synchronized"), it is possible to snapshot both peers using one command.
- Yet, it is not guaranteed that the created snapshots will be identical on the two peers. (a snapshots are individual to each peer)
- Snapshots can be created only on synchronized peers.
- Means that the peer contains the latest data.
- If a snapshot was requested on a peer that is not synchronized, the snapshot operation will fail.
Creating a Snapshot
The create snapshot command is not application-aware and therefore does not create an application-consistent snapshot by default. In order to create an application-consistent snapshot, please refer to the application's vendor documentation.
The create snapshot command allows to state a specific system using the "–system" argument.
- Creating a snapshot on both peers is possible only if both peers are mapped to the host.
Creating a snapshot on both peers
If a system was not specified when creating a snapshot on an Active-Active volume:
- Host PowerTools would try to create a snapshot on each peer that is mapped to the host.
If both peers are mapped, but one of the peers is not synchronized - the command fails and no snapshot will be created.
The created snapshot on each peer is individual. The snapshots are not created at the exact same point-in-time, thus are not identical.
Creating a snapshot on a specific peer
If a system was specified, Host PowerTools would create a snapshot only on the specified peer.