Hp Storageworks Eva Specifics - HP Data Protector A.06.11 Integration Manual

• If the provider is in VSS compliant mode, the replica is an independent copy or
clone of the source volume with no pair relationship between the replica and its
source volume.
• If the provider is in resync mode, the replica and its source volume are in a
suspended mirror relationship, so you can only restore such a replica by
re-synchronizing the replica with its source volume.
Snapshot replica
This type of replica is produced using snapshot technology, provided by HP
StorageWorks Enterprise Virtual Array.
With a snapshot replica, no synchronization is required before creating the fixed
point-in-time copies, because a snapshot is a logical copy of pointers to the data
rather than the data itself. Snapshot replicas are considered to be created almost
instantaneously and are immediately available for use. However, with the snapclone
type of replica, background processes may still run for some time afterwards.
A range of snapshot techniques is available, each with its own particular merits from
the storage and data processing points of view. Data Protector supports the following
snapshot replica types using the EVA hardware provider:
• Snapshot with pre-allocation of disk space (standard snapshot).
• Snapshot without pre-allocation of disk space (vsnap or virtually capacity-free
snapshot).
• A full copy of the source volume (original virtual disk), independent of the original
virtual disk (snapclone).
You select the replica type in the Data Protector GUI when creating a backup
specification. However, you can choose between snapshot, clone, or default:
If you select Snapshot (Differential), standard snapshots are created by default. To
create vsnaps, configure the hardware provider to create vsnaps before creating a
backup specification.
If you select Mirror/Clone (Plex), a snapclone is created.
If you select Default, the replica type created will be the one which is configured in
the hardware provider.
Note that for instant recovery, only snapclones are supported.

HP StorageWorks EVA specifics

• When the cloning process for a source volume is in progress, another replica of
the same source volume cannot be created.
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