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Veritas NetBackup™ Snapshot Client Administrator's Guide

Last Published: 2018-09-19

Product(s): NetBackup (8.1.2)

Platform: Linux,UNIX,Windows

Identifying and removing a left-over snapshot

NetBackup ordinarily removes snapshots after the Snapshot Client backup completes, unless the Keep snapshot after backup parameter was set to Yes. However, as a result of some system failures, such as a system crash or abnormal backup termination, the snapshot may not be removed.

To identify and remove a left-over snapshot

Use the bpfis command with the query option to list the current snapshots. Enter the following on the client or alternate client, depending on the type of backup:
```
   /usr/openv/netbackup/bin/bpfis query
```
This command returns the IDs (FIS IDs) of all current snapshots. For example:
```
INF - BACKUP START 3629
INF - FIS IDs: 1036458302
INF - EXIT STATUS 0: the requested operation was successfully 
completed
```
In this example, the snapshot ID is 1036458302.
If the bpfis output shows the ID of the snapshot, delete it as follows:
```
   bpfis delete -id snapshot_id
```
If bpfis removed the snapshot, you can skip the rest of this procedure.
Solaris, HP, AIX, Linux: if bpfis could not remove the snapshot, enter the following (on the client or alternate client) when no backups are running:
```
   df -k
```
This command displays all mounted file systems, including any snapshots of a mounted file system.
If a snapshot backup is currently running, the snapshot should not be deleted. NetBackup deletes it when the backup completes.
Here are two snapshots from a df -k listing:
```
/dev/dsk/c1t3d2s4  1048800  73076  914742  8%  /tmp/_vrts_frzn_img__wil_vxfs_1299000
/dev/vx/dsk/clone_qes_clone/ufs 38383 21678  12867  63%  /tmp/_vrts_frzn_img
__mix_ufs_1299000
```
The snapshot appears in the following form:
```
/tmp/_vrts_frzn_img__filesystemname_pid
```
Solaris, HP, AIX, Linux: unmount the unneeded snapshot file systems (on the client or alternate client, depending on the type of backup).
The next step depends on the type of snapshot.
For nbu_snap (Solaris only):
- Enter the following to display leftover snaps:
```
   /usr/openv/netbackup/bin/driver/snaplist
```
- To remove a leftover snap, enter
```
   /usr/openv/netbackup/bin/driver/snapoff snap1 ... snapn
```
  More information is available on snaplist and snapoff.
  See About managing nbu_snap.
For VxVM (Solaris, HP, AIX, Linux) and VVR (Solaris and HP):
Do the following on the client for VxVM, and on the alternate client for VVR:
- Enter the following to display unsynchronized mirror disks:
```
   vxprint -g diskgroup
```
- Enter the following to resynchronize the mirror disks:
```
   vxassist -g diskgroup -v volume snapback
```
For VxVM (Windows):
- Enter the following to display unsynchronized mirror disks:
```
    vxdg -g diskgroup dginfo
```
- Enter the following to resynchronize the mirror disks:
```
vxassist snapback \Device\HarddiskDmVolumes\diskgroup\snap_volume
```
For VxFS_Checkpoint (Solaris, HP, AIX, Linux):
- Enter the following VxFS command to display the name of the checkpoint:
```
   /usr/lib/fs/vxfs/fsckptadm list /file_system
```
  Note:
  file_system is the mount point of the primary file system that was backed up, NOT the snapshot file system that was unmounted in a previous step.
  For example, if the snapshot file system that was unmounted is the following:
```
   /tmp/_vrts_frzn_img__vm2_1765
```
  the original file system, which should be specified on the fsckptadm list command, is the following:
```
   /vm2
```
  Example entry:
```
   /usr/lib/fs/vxfs/fsckptadm list /vm2
```
  Output:
```
/vm2
NBU+2004.04.02.10h53m22s:
    ctime                =  Fri Apr 02 10:53:23 2004
    mtime                =  Fri Apr 02 10:53:23 2004
    flags                =  removable
```
  In this example, the name of the checkpoint is NBU+2004.04.02.10h53m22s.
- Remove the checkpoint by entering the following:
```
/usr/lib/fs/vxfs/fsckptadm remove name_of_checkpoint /file_system
```
  For example:
```
/usr/lib/fs/vxfs/fsckptadm remove NBU+2004.04.02.10h53m22s /vm2
```
- If the checkpoint cannot be removed, unmount it (umount) and retry the following:
```
/usr/lib/fs/vxfs/fsckptadm remove name_of_checkpoint /file_system
```
- For more detail on removing VxFS clones, refer to the recommended actions for NetBackup status code 156 in the NetBackup Troubleshooting Guide.
For TimeFinder, ShadowImage, BusinessCopy (Solaris or HP only):
Do the following on the client or alternate client, depending on the type of backup:
- To discover and remove any VxVM clones:
  See Removing a VxVM volume clone.
- Enter the following to resynchronize the mirror disks:
  For EMC arrays (TimeFinder):
```
   symmir -g device_group establish LdevName
```
  where LdevName is the logical device name of the standard device. For Hitachi and HP arrays (ShadowImage, BusinessCopy):
```
   pairresync -g groupname -d dev_name
```
  For more information about EMC, Hitachi, and HP arrays and resynchronizing disks, see the NetBackup Snapshot Client Configuration document:
  http://www.veritas.com/docs/000081320
For VxFS_Snapshot (Solaris or HP only):
Using the mounted file system from a previous step, unmount the snapshot as follows:
```
   umount -F vxfs /tmp/_vrts_frzn_img__filesystemname_pid
```
For FlashSnap (Solaris, HP, AIX, Linux):
Do the following on the client or alternate client, depending on the type of backup:
- Find the VxVM disk group:
```
   vxdg list
```
- The format of the disk group name is as follows:
```
   SPLIT-primaryhost_diskgroup
```
  If vxdg list does not show the disk group, the group might have been deported. You can discover all the disk groups, including deported ones, by entering:
```
   vxdisk -o alldgs list
```
  The disk groups in parentheses are not imported on the local system.
- Deport the VxVM disk group:
```
   vxdg deport SPLIT-primaryhost_diskgroup
```
- On the primary (original) client, import and join the VxVM disk group:
```
   vxdg import SPLIT-primaryhost_diskgroup
    vxrecover -g SPLIT-primaryhost_diskgroup -m
    vxdg join SPLIT-primaryhost_diskgroup diskgroup
```
- On the primary (original) client, start the volume and snap back the snapshot volume:
```
vxvol -g SPLIT-primaryhost_diskgroup start SNAP-diskgroup_volume
vxassist snapback SNAP-diskgroup_volume
```
  Example:
  In this example, chime is the primary client and rico is the alternate client. 1hddg is the name of the original disk group on chime.
  chime_lhddg is the split group that was imported on rico and must be rejoined to the original group on the primary chime.
  On alternate client rico, enter:
```
vxdg deport chime_lhddg
```
  On primary client chime, enter:
```
vxdg import chime_lhddg
vxrecover -g chime_lhddg -m
vxdg join chime_lhddg lhddg
vxvol start SNAP-lhddg-vol01
vxassist snapback SNAP-lhddg-vol01
```

For FlashSnap (Windows):

Find the VxVM disk group:
```
   vxdg list
```
The format of the disk group name is as follows:
```
   SPLIT-primaryhost_diskgroup
```
Deport the VxVM disk group:
```
   vxdg -g split_diskgroup deport
```

On the primary (original) client, import and join the VxVM disk group:

   vxassist rescan
    vxdg -g split_diskgroup import
    vxdg -g split_diskgroup -n diskgroup join

On the primary (original) client, snap back the snapshot volume:

vxassist snapback \Device\HarddiskDmVolumes\diskgroup\snap_volume

More Information

Logging directories for UNIX platforms

Logging folders for Windows platforms

Customer support contact information

Latest patches and updates

Important notes on Snapshot Client

Snapshot Client installation problems

Snapshot provider information

Removing a VxVM volume clone