By default, disks on which the
udid_mismatch flag or the
clone_disk flag has been set are not imported by the
import command unless all disks in the disk group have at least one of these flags set, and no two of the disks have the same UDID. You can then import the cloned disks by specifying the
useclonedev=on option to the
import command, as shown in this example:
vxdg -o useclonedev=on
This form of the command allows only cloned disks to be imported. All non-cloned disks remain unimported.
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.
-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 use the following command to tag all the disks in the disk group that are to be imported:
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 hdisk14 hdisk15
Alternatively, you can update the UDIDs of the cloned disks.
See "Writing a new UDID to a disk" on page 162.
To check which disks are tagged, use the
DANAME DMNAME NAME VALUE
hdisk1 mydg01 - -
hdisk2 mydg02 - -
hdisk12 mydg05 my_tagged_disks -
hdisk13 mydg06 my_tagged_disks -
hdisk14 mydg07 my_tagged_disks -
hdisk15 mydg08 my_tagged_disks -
hdisk16 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:
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:
set tagmeta=on tag=
To check which disks in a disk group contain copies of this configuration information, use the
vxdg [-q] listmeta
-q option can be specified to suppress detailed configuration information from being displayed.
The tagged disks in the disk group may be imported by specifying the tag to the
import command in addition to the
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
-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
See "Renaming a disk group" on page 168.
To remove a tag from a disk, use the
rmtag command, as shown in the following example:
vxdisk rmtag tag=my_tagged_disks hdisk15
vxdg(1M) manual pages.