Creating space-optimized snapshots
A cache object called NBU_CACHE must be created in the disk group containing the volume to be backed up. NetBackup recognizes the cache object and uses it to create a space-optimized snapshot.
To create space-optimized snapshots
- Create the parent volume:
/usr/sbin/vxassist -g disk_group make volume size layout=layout logtype=dco dcoversion=20 [drl=no|sequential|yes] [ndcomirror=number] fastresync=on
Where:
Brackets [ ] indicate optional items.
make volume specifies the name of the volume snapshot.
- Create the cache object:
/usr/sbin/vxassist -g disk_group make cache_volume size layout=layout init=active
- Label the cache object:
/usr/sbin/vxmake -g disk_group cache NBU_CACHE cachevolname=cache_volume
- Enable the cache object:
/usr/sbin/vxcache -g disk_group start NBU_CACHE
- Take the initial snapshot:
/usr/sbin/vxsnap -g disk_group make source=volume/newvol =SNAP_vol1_NBU/cache=NBU_CACHE
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