SPARC: How to Perform Online Backups for Volumes (VERITAS Volume Manager)
VERITAS Volume Manager identifies a mirrored volume as a plex. A plex can be backed up without unmounting it or taking the entire volume offline. This is done by creating a snapshot copy of the volume and backing up this temporary volume without halting the system or denying user access to the data.
Be sure the cluster is running problem-free before performing the backup procedure.
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Log on to any node in the cluster, and become superuser on the current primary node for the disk group on the cluster.
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List the disk group information.
# vxprint -g diskgroup
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Run the scstat(1M) command to see which node has the disk group currently imported, indicating it is the primary node for the disk group.
# scstat -D
- -D
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Shows the status for all disk device groups.
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Create a snapshot of the volume using the vxassist command.
# vxassist -g diskgroup snapstart volume
Note –Creating a snapshot can take a long time depending on the size of your volume.
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Verify the new volume was created.
# vxprint -g diskgroup
When the snapshot is complete, a status of Snapdone displays in the State field for the selected disk group.
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Stop any data services that are accessing the file system.
# scswitch -z -g resource-group[,...] -h ““
Note –Stop all data services to ensure that the data file system is properly backed up. If no data services are running, you do not need to perform Step 6 and Step 8.
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Create a backup volume named bkup-vol and attach the snapshot volume to it using the vxassist command.
# vxassist -g diskgroup snapshot volume bkup-vol
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Restart any data services that were stopped in Step 6, using the scswitch(1M) command.
# scswitch -z -g resource-group[,...] -h node[,...]
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Verify the volume is now attached to the new volume bkup-vol using the vxprint command.
# vxprint -g diskgroup
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Register the disk group configuration change.
# scconf -c -D name=diskgroup,sync
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Check the backup volume using the fsck command.
# fsck -y /dev/vx/rdsk/diskgroup/bkup-vol
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Perform a backup to copy the volume bkup-vol to tape or another medium.
Use the ufsdump(1M) command or the backup utility you normally use.
# ufsdump 0ucf dump-device /dev/vx/dsk/diskgroup/bkup-vol
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Remove the temporary volume using vxedit.
# vxedit -rf rm bkup-vol
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Register the disk group configuration changes using the scconf(1M) command.
# scconf -c -D name=diskgroup,sync
SPARC: Example—Performing Online Backups for Volumes (VERITAS Volume Manager)
In the following example, the cluster node phys-schost-2 is the primary owner of the metaset disk group schost-1, therefore the backup procedure is performed from phys-schost-2. The volume /vo101 is copied and then associated with a new volume, bkup-vol.
[Become superuser on the primary node.]
[Identify the current primary node for the disk group:]
# scstat -D
-- Device Group Servers --
Device Group Primary Secondary
------------ ------- ---------
Device group servers: rmt/1 - -
Device group servers: schost-1 phys-schost-2 phys-schost-1
-- Device Group Status --
Device Group Status
------------ ------
Device group status: rmt/1 Offline
Device group status: schost-1 Online
[List the disk group information:]
# vxprint -g schost-1
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
dg schost-1 schost-1 - - - - - -
dm schost-101 c1t1d0s2 - 17678493 - - - -
dm schost-102 c1t2d0s2 - 17678493 - - - -
dm schost-103 c2t1d0s2 - 8378640 - - - -
dm schost-104 c2t2d0s2 - 17678493 - - - -
dm schost-105 c1t3d0s2 - 17678493 - - - -
dm schost-106 c2t3d0s2 - 17678493 - - - -
v vol01 gen ENABLED 204800 - ACTIVE - -
pl vol01-01 vol01 ENABLED 208331 - ACTIVE - -
sd schost-101-01 vol01-01 ENABLED 104139 0 - - -
sd schost-102-01 vol01-01 ENABLED 104139 0 - - -
pl vol01-02 vol01 ENABLED 208331 - ACTIVE - -
sd schost-103-01 vol01-02 ENABLED 103680 0 - - -
sd schost-104-01 vol01-02 ENABLED 104139 0 - - -
pl vol01-03 vol01 ENABLED LOGONLY - ACTIVE - -
sd schost-103-02 vol01-03 ENABLED 5 LOG - - -
[Start the snapshot operation:]
# vxassist -g schost-1 snapstart vol01
[Verify the new volume was created:]
# vxprint -g schost-1
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
dg schost-1 schost-1 - - - - - -
dm schost-101 c1t1d0s2 - 17678493 - - - -
dm schost-102 c1t2d0s2 - 17678493 - - - -
dm schost-103 c2t1d0s2 - 8378640 - - - -
dm schost-104 c2t2d0s2 - 17678493 - - - -
dm schost-105 c1t3d0s2 - 17678493 - - - -
dm schost-106 c2t3d0s2 - 17678493 - - - -
v vol01 gen ENABLED 204800 - ACTIVE - -
pl vol01-01 vol01 ENABLED 208331 - ACTIVE - -
sd schost-101-01 vol01-01 ENABLED 104139 0 - - -
sd schost-102-01 vol01-01 ENABLED 104139 0 - - -
pl vol01-02 vol01 ENABLED 208331 - ACTIVE - -
sd schost-103-01 vol01-02 ENABLED 103680 0 - - -
sd schost-104-01 vol01-02 ENABLED 104139 0 - - -
pl vol01-03 vol01 ENABLED LOGONLY - ACTIVE - -
sd schost-103-02 vol01-03 ENABLED 5 LOG - - -
pl vol01-04 vol01 ENABLED 208331 - SNAPDONE - -
sd schost-105-01 vol01-04 ENABLED 104139 0 - - -
sd schost-106-01 vol01-04 ENABLED 104139 0 - - -
[Stop data services, if necessary:]
# scswitch -z -g nfs-rg -h ““
[Create a copy of the volume:]
# vxassist -g schost-1 snapshot vol01 bkup-vol
[Restart data services, if necessary:]
# scswitch -z -g nfs-rg -h phys-schost-1
[Verify bkup-vol was created:]
# vxprint -g schost-1
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
dg schost-1 schost-1 - - - - - -
dm schost-101 c1t1d0s2 - 17678493 - - - -
...
v bkup-vol gen ENABLED 204800 - ACTIVE - -
pl bkup-vol-01 bkup-vol ENABLED 208331 - ACTIVE - -
sd schost-105-01 bkup-vol-01 ENABLED 104139 0 - - -
sd schost-106-01 bkup-vol-01 ENABLED 104139 0 - - -
v vol01 gen ENABLED 204800 - ACTIVE - -
pl vol01-01 vol01 ENABLED 208331 - ACTIVE - -
sd schost-101-01 vol01-01 ENABLED 104139 0 - - -
sd schost-102-01 vol01-01 ENABLED 104139 0 - - -
pl vol01-02 vol01 ENABLED 208331 - ACTIVE - -
sd schost-103-01 vol01-02 ENABLED 103680 0 - - -
sd schost-104-01 vol01-02 ENABLED 104139 0 - - -
pl vol01-03 vol01 ENABLED LOGONLY - ACTIVE - -
sd schost-103-02 vol01-03 ENABLED 5 LOG - - -
[Synchronize the disk group with cluster framework:]
# scconf -c -D name=schost-1,sync
[Check the file systems:]
# fsck -y /dev/vx/rdsk/schost-1/bkup-vol
[Copy bkup-vol to the backup device:]
# ufsdump 0ucf /dev/rmt/0 /dev/vx/rdsk/schost-1/bkup-vol
DUMP: Writing 63 Kilobyte records
DUMP: Date of this level 0 dump: Tue Apr 25 16:15:51 2000
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/vx/dsk/schost-2/bkup-vol to /dev/rmt/0.
...
DUMP: DUMP IS DONE
[Remove the bkup-volume:]
# vxedit -rf rm bkup-vol
[Synchronize the disk group:]
# scconf -c -D name=schost-1,sync
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