To create full-sized snapshots

1. Enter the following to create the parent volume:

   /usr/sbin/vxassist -g disk_group make volume length 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.

2. Create a volume for a full-sized instant snapshot:

   • Determine the required size for the snapshot volume:

        # LEN='vxprint -g disk_group -F%len volume'

   • Find the name of the DCO volume:

        # DCOVOL='vxprint -g disk_group -F%dconame volume'

   • Discover the DCO volume's region size (in blocks):

        # RSZ='vxprint -g disk_group -F%regionsz $DCOVOL'

   • Create a volume that is named volumename_NBU, of the required size and redundancy.

     The volume name must end with _NBU. In the following example, the volume is named SNAP_vol1_NBU.

     vxassist -g disk_group make SNAP_vol1_NBU $LEN layout=mirror
         nmirror=number logtype=dco drl=no dcoversion=20
         ndcomirror=number regionsz=$RSZ init=none
         [storage attributes ...]

     The number for nmirror should equal the number for ndcomirror.

     Note:

     For Linux, the init value should be init=active instead of init=none.

     For Solaris 10 with Storage Foundation 5.1, the init value should be init=active instead of init=none.

   • Create the mirror:

     vxsnap -g disk_group make source=volume/snapvol=SNAP_vol1_NBU/syncing=on

3. Set the Maximum Snapshots (Instant Recovery only) value on the NetBackup Snapshot Client Options dialog.