EMC Storage Product Knowledge Sharing

Handling BCV and Clone Disk on Veritas Volume Manager.

Get Output of Vxdisk List command

# vxdisk list

Vxdisk list command showing that some disks are marked with the udid_mismatch flag.

Write a New UUID to Disk

You can use the following command to update the unique disk identifier (UDID) for one or more disks:

# vxdisk [-f] [-g diskgroup] updateudid disk ...

Note : The -f option must be specified if VxVM has not raised the udid_mismatch flag for a disk.

Importing a disk group containing cloned/BCV disks

You can then import the cloned disks by specifying the -ouseclonedev=on option to the vxdgimport command, as shown in this example:

# vxdg -o useclonedev=on [-o updateid] import mydg ( Group Name )

Note: This form of the command allows only cloned disks to be imported. All non-cloned disks remain unimported. .) However, the import fails if multiple copies of one or more cloned disks exist.

You can use the following command to tag all the disks in the disk group that are to be imported:

# vxdisk [-g diskgroup] settag tagname disk ...

where tagname is a string of up to 128 characters, not including spaces or tabs.
For example, the following command sets the tag, my_tagged_disks, on several disks that are to be imported together:

You can use the following command to ensure that a copy of the metadata is placed on a disk, regardless of the placement policy for the disk group:

# vxdisk [-g diskgroup] set disk keepmeta=always

Alternatively, use the following command to place a copy of the configuration
database and kernel log on all disks in a disk group that share a given tag:

# vxdg [-g diskgroup] set tagmeta=on tag=tagname nconfig=all nlog=all

To check which disks in a disk group contain copies of this configuration information, use the vxdglistmeta command:

# vxdg [-q] listmeta diskgroup

The tagged disks in the disk group may be imported by specifying the tag to the vxdgimport command in addition to the -ouseclonedev=on option:

# vxdg -o useclonedev=on -o tag=my_tagged_disks import mydg

If you have already imported the non-cloned disks in a disk group, you can use
the -n and -t option to specify a temporary name for the disk group containing
the cloned disks:

# vxdg -t -n clonedg -o useclonedev=on -o tag=my_tagged_disks import mydg