Veritas NetBackup™ Snapshot Client Administrator's Guide

To test volumes for FlashSnap on UNIX

1. On the primary host:

   • Add a DCO log to the volume:

        vxassist -g diskgroup addlog volume logtype=dco

   • Enable FastResync on the volume:

        vxvol -g diskgroup set fastresync=on volume
     

   • Create a new snapshot mirror:

        vxassist -g diskgroup -b snapstart volume

   • Create a snapshot volume from the primary volume:

     For disk groups that were created with VxVM 5.x:

        vxassist -g diskgroup snapshot volume snap_volume

     Note:

     Choose a volume name that is fewer than 15 characters. Volume names are prefixed or suffixed with characters, which increases the volume name. Lengthy volume names can cause snapshot jobs to fail.

     For disk groups that were created with VxVM 4.x:

        vxsnap -g diskgroup snapshot volume snap_volume
     

     For disk groups that were created with VxVM 3.x:

        vxassist -g diskgroup snapshot volume snap_volume
     

   • Move the disks containing the snapshot volume to a separate (split) disk group:

        vxdg split diskgroup split_diskgroup snap_volume
     

     If the volume has not been properly configured, you may see an error similar to the following:

     host-name# vxdg split lhdvvr lhdvvr_split SNAP-emc_concat
     vxvm:vxdg: ERROR: vxdg split lhdvvr lhdvvr_split failed
     vxvm:vxdg: ERROR: emc_dis05 : Disk moving, but not all
     subdisks on it

   • Re-examine the layout of the disks and the volumes that are assigned to them, and reassign the unwanted volumes to other disks as needed.

     Consult the Veritas FlashSnap Point-In-Time Copy Solutions Administrator's Guide for examples of disk groups that can and cannot be split.

   • Deport the split disk group:

        vxdg deport split_diskgroup
     

2. On the secondary host:

   • Import the disk group that was deported from the primary:

        vxdg import split_diskgroup
     

   • Enable the imported volume:

        vxrecover -g split_diskgroup -m snap_volume
     

   • Start the volume:

        vxvol -g split_diskgroup start snap_volume

     If these commands execute successfully, the volume setup is correct.

3. After this test, you must re-establish the original configuration to what it was before you tested the volumes.

   • Deport the disk group on the alternate client.

   • Import the disk group on the primary client.

   • Recover and join the original volume group.

To test volumes for FlashSnap on Windows

1. On the primary host:

   • If not already done, create a snapshot mirror:

     vxassist snapstart \Device\HarddiskDmVolumes\diskgroup\volume
     

   • Create a snapshot volume from the primary volume:

     vxassist snapshot \Device\HarddiskDmVolumes\diskgroup\volume
         DrivePath=C:\Temp\Mount SNAP-Volume

   • Move the disks containing the snapshot volume to a separate (split) disk group.

     The disk group is also deported after this command completes:

     vxdg -g DskGrp -n SPLIT-DskGrp split
         \Device\HarddiskDmVolumes\diskgroup\snap_volume
     

2. On the secondary host:

   • Rescan to make the deported disk group visible on the secondary host:

     vxassist rescan

   • Import the disk group that was deported from the primary:

     vxdg -g split_diskgroup import

   • Assign the snapshot volume to an empty NTFS directory.

     This example uses C:\Temp\Mount.

     vxassist assign \Device\HarddiskDmVolumes\split_diskgroup
         \snap_volume DrivePath=C:\Temp\Mount

     If these commands execute successfully, the volume setup is correct.