Restoration of an xp snapshot pair – HP StorageWorks XP Remote Web Console Software User Manual
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Figure 4 Overview of Storing XP Snapshot Data by a Consistency Group
When an XP24000/XP20000 Disk Array accepts the command from RAID Manager, which
requests storing the data by a consistency group (1 in
), all status of the XP
Snapshot pairs in the corresponding consistency group will change to PSUS (2 in
). After that, when the host issues write I/O request to each P-VOL in the corresponding
consistency group (3 in
), snapshot data of corresponding volume is stored (4
in
).
You can also use the RAID Manager commands to store snapshot data by a consistency group.
From XP Remote Web Console, you can only view the consistency groups.
XP Snapshot does not support Quick Split mode. Therefore, even if you specify Quick Split mode,
Quick Split mode does not take effect.
Restoration of an XP Snapshot Pair
XP Snapshot can restore the contents of the P-VOL to the state when the snapshot data was stored
in the pool by writing the snapshot data back to the P-VOL. Writing the snapshot data to the P-VOL
is called restoration of the XP Snapshot pair.
If you restore the pair when the data is written in the S-VOL, instead of the snapshot data, the data
in the S-VOL will be written back to the P-VOL.
If there are problems with the data of a P-VOL during a failure, you can restore the P-VOL to the
normal state when the snapshot data was stored by executing restoration.
Deletion of XP Snapshot Data or an XP Snapshot Pair
The status of the XP Snapshot pair will be PSUE (status when the failure occurred) when, as a result
of writing data in the volume of that pair, the capacity of snapshot data exceeds the capacity of
the pool specified when the pool was defined. An XP Snapshot pair cannot be created and snapshot
data cannot be stored in the pool. Therefore, unnecessary snapshot data needs to be deleted.
There are two ways to delete snapshot data:
XP Snapshot Operations
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