HP 418800-B21 HP StorageWorks Replication Solutions Manager 4.0.1 user guide ( - Page 434
Instant restore overview virtual disks, Instant restore from mirrorclones
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Source Vraid0 Vraid1 Vraid5 none >>> high >>> medium >>> Snapclone copy Vraid0, Vraid1, or Vraid5 Vraid0, Vraid1, or Vraid5 Vraid0, Vraid1, or Vraid5 Snapshot copy Vraid0 Vraid0, Vraid1, or Vraid5 Vraid0, Vraid5 Remote copy Vraid0, Vraid1, or Vraid5 Vraid0, Vraid1, or Vraid5 Vraid0, Vraid1, or Vraid5 Instant restore overview (virtual disks) The instant restore feature allows you to restore data on a virtual disk with data from one of its previously created replicas (mirrorclone, snapclone or snapshot). The operation is instant because the restored data is available within seconds for host I/O (the actual data transfer occurs in the background). For example, assume that the database named sales_db becomes corrupt. You can instantly restore it to a prior state from one of its replicas. sales_db
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 |
 |
Source
Snapclone copy
Snapshot copy
Remote copy
Vraid0
none
>>>
Vraid0, Vraid1, or
Vraid5
Vraid0
Vraid0, Vraid1, or
Vraid5
Vraid1
high
>>>
Vraid0, Vraid1, or
Vraid5
Vraid0, Vraid1, or
Vraid5
Vraid0, Vraid1, or
Vraid5
Vraid5
medium
>>>
Vraid0, Vraid1, or
Vraid5
Vraid0, Vraid5
Vraid0, Vraid1, or
Vraid5
Instant restore overview (virtual disks)
The
instant restore
feature allows you to restore data on a virtual disk with data from one of its previously
created replicas (mirrorclone, snapclone or snapshot). The operation is
instant
because the restored data
is available within seconds for host I/O (the actual data transfer occurs in the background).
For example, assume that the database named
sales_db
becomes corrupt. You can instantly restore it to
a prior state from one of its replicas.
sales_db
<======
sales_db_backup
disk being restored
replica to restore from
See also instant restore from
mirrorclones
,
snapclones
, and
snapshots
.
Best practices
•
For most situations, HP recommends that you perform instant restores using GUI actions, not jobs.
•
To ensure data integrity, an instant restore should only be performed on an unmounted,
unpresented virtual disk.
•
If the virtual disk is mounted, use the following general approach.
1.
Stop host I/O to the disk that is being restored.
2.
Unmount the disk. This forces the disk’s write cache to be
fl
ushed (emptied).
3.
Perform an instant restore to the disk.
Procedure
.
If the restored host volume does not have consistent data left in cache after following this
procedure, repeat the procedure.
See
restoring host volumes (instant restore)
for the detailed procedure.
Instant restore from mirrorclones
This feature allows you to restore data on a virtual disk with data from its fractured mirrorclone.
For example, restore the virtual disk named
sales_db
with the data from it’s fractured mirrorclone
sales_db_backup
.
sales_db
<======
sales_db_backup
disk being restored
replica to restore from
(fractured mirrorclone)
See also,
instant restore overview (virtual disks)
.
Scenario, restoring from "a planned point-in-time"
1.
Create a mirrorclone of the disk to be restored at some future date.
Procedure
.
2.
At a point-in-time you want, fracture the mirrorclone. The mirrorclone contains point-in-time data.
3.
When necessary, restore the disk from its mirrorclone.
Procedure
.
434
Virtual disks