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Specifying storage for version 20 DCO plexes

If the disks that contain volumes and their snapshots are to be moved into different disk groups, you must ensure that the disks that contain their DCO plexes can accompany them. You can use storage attributes to specify which disks to use for the DCO plexes. (If you do not want to use dirty region logging (DRL) with a volume, you can specify the same disks as those on which the volume is configured, assuming that space is available on the disks). For example, to add a DCO object and mirrored DCO volume with plexes on disk05 and disk06 to the volume, myvol, use the following command:

# vxsnap -g mydg prepare myvol ndcomirs=2 alloc=disk05,disk06

To view the details of the DCO object and DCO volume that are associated with a volume, use the vxprint command. The following is example vxprint -vh output for the volume named vol1 (the TUTIL0 and PUTIL0 columns are omitted for clarity):


v vol1 fsgen ENABLED 1024 - ACTIVE

pl vol1-01 vol1 ENABLED 1024 - ACTIVE

sd disk01-01 vol1-01 ENABLED 1024 0 -

pl foo-02 vol1 ENABLED 1024 - ACTIVE

sd disk02-01 vol1-02 ENABLED 1024 0 -

dc vol1_dco vol1 - - - -

v vol1_dcl gen ENABLED 132 - ACTIVE

pl vol1_dcl-01 vol1_dcl ENABLED 132 - ACTIVE

sd disk03-01 vol1_dcl-01 ENABLED 132 0 -

pl vol1_dcl-02 vol1_dcl ENABLED 132 - ACTIVE

sd disk04-01 vol1_dcl-02 ENABLED 132 0 -

In this output, the DCO object is shown as vol1_dco, and the DCO volume as vol1_dcl with 2 plexes, vol1_dcl-01 and vol1_dcl-02.

If required, you can use the vxassist move command to relocate DCO plexes to different disks. For example, the following command moves the plexes of the DCO volume, vol1_dcl, for volume vol1 from disk03 and disk04 to disk07 and disk08:

# vxassist -g mydg move vol1_dcl !disk03 !disk04 disk07 disk08

See "Moving DCO volumes between disk groups" on page 186.

See the vxassist(1M) manual page.

See the vxsnap(1M) manual page.