HP P6000 Continuous Access Software - Manual (Page 260)

Impacts of an occupancy warning
When an occupancy warning is issued:
•
No virtual disks (LUNs) in the disk group can be created or enlarged.
•
No mirrorclones, snapclones, or snapshots can be created in the disk group.
•
The disk drive failure protection level (spares) in the disk group cannot be increased.
Cross Vraid guidelines
Cross Vraid (redundancy) guidelines:
•
Snapclone copy. Redundancy level can be higher or lower than the source.
•
Snapshot copy. Redundancy level cannot be higher than the source.
•
Remote copy. Redundancy level can be higher or lower than the source.
See also virtual disk Redundancy level .
Quick reference
Remote copy Snapshot copy Snapclone copy Source
Vraid0, Vraid1, or Vraid5,
Vraid6 Vraid0 Vraid0, Vraid1, or Vraid5,
Vraid6 >>> none Vraid0
Vraid0, Vraid1, or Vraid5,
Vraid6 Vraid0, Vraid1, or Vraid5 Vraid0, Vraid1, or Vraid5,
Vraid6 >>> high Vraid1
Vraid0, Vraid1, or Vraid5,
Vraid6 Vraid0, Vraid5 Vraid0, Vraid1, or Vraid5,
Vraid6 >>> medium Vraid5
Vraid0, Vraid1, or Vraid5,
Vraid6 Vraid0, Vraid1, or Vraid5,
Vraid6 Vraid0, Vraid1, or Vraid5,
Vraid6 Vraid6
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_backup <====== sales_db
replica to restore from disk being restored
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.
•
Instant restore of the snapshot of a mirrorclone is supported on some versions of controller
software. See
Controller software features - local replication for the software versions that
support this feature.
•
If the virtual disk is mounted, use the following general approach.
260 Virtual disks