Creating full-sized snapshots

Unlike the space-optimized snapshot, NetBackup cannot create VxVM full-sized instant snapshots: you must create them before running the backup, as explained in the following procedure. You must create one full-sized instant snapshot for each backup you want to run.

To create full-sized snapshots

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.

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

More Information

About creating Instant Snapshots

Creating full-sized snapshots

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