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177Creating and administering disk groups
Handling disks with duplicated identifiers
# vxdg -o useclonedev=on [-o updateid] import mydg
Note: This form of the command allows only cloned disks to be imported. All
non-cloned disks remain unimported.
If the clone_disk flag is set on a disk, this indicates the disk was previously
imported into a disk group with the udid_mismatch flag set.
The
-o updateid option can be specified to write new identification attributes
to the disks, and to set the clone_disk flag on the disks. (The
vxdisk set
clone=on
command can also be used to set the flag.) However, the import fails if
multiple copies of one or more cloned disks exist. In this case, you can either
update the UDIDs of the cloned disks as described in “Writing a new UDID to a
disk” on page 176, or 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:
# vxdisk settag my_tagged_disks c2t66d0 c2t67d0
To check which disks are tagged, use the vxdisk listtag command:
# vxdisk listtag
DANAME DMNAME NAME VALUE
c0t06d0 mydg01 - -
c0t16d0 mydg02 - -
...
c2t64d0 mydg05 my_tagged_disks -
c2t65d0 mydg06 my_tagged_disks -
c2t66d0 mydg07 my_tagged_disks -
c2t67d0 mydg08 my_tagged_disks -
c2t68d0 mydg09 - -
The configuration database in a VM disk’s private region contains persistent
configuration data (or metadata) about the objects in a disk group. This database
is consulted by VxVM when the disk group is imported. At least one of the
cloned disks that are being imported must contain a copy of the current
configuration database in its private region.
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