Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

208 Creating and administering subdisks
Displaying subdisk information
Note: As for all VxVM commands, the default size unit is s, representing a sector. Add a
suffix, such as k for kilobyte,
m for megabyte or g for gigabyte, to change the unit of size.
For example, 500m would represent 500 megabytes.
If you intend to use the new subdisk to build a volume, you must associate the subdisk
with a plex (see “Associating subdisks with plexes” on page 210). Subdisks for all plex
layouts (concatenated, striped, RAID-5) are created the same way.
Displaying subdisk information
The vxprint command displays information about VxVM objects. To display general
information for all subdisks, use this command:
# vxprint -st
The -s option specifies information about subdisks. The -t option prints a single-line
output record that depends on the type of object being listed.
The following is example output:
SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE
SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE
sd mydg01-01 vol1-01 mydg01 0 102400 0 c2t0d1 ENA
sd mydg02-01 vol2-01 mydg02 0 102400 0 c2t1d1 ENA
You can display complete information about a particular subdisk by using this command:
# vxprint [-g diskgroup] -l subdisk
For example, the following command displays all information for subdisk mydg02-01 in
the disk group, mydg:
# vxprint -g mydg -l mydg02-01
This command provides the following output:
Disk group: mydg
Subdisk: mydg02-01
info: disk=mydg02 offset=0 len=205632
assoc: vol=mvol plex=mvol-02 (offset=0)
flags: enabled
device: device=c2t1d1 path=/dev/vx/dmp/c2t1d1 diskdev=32/68
Moving subdisks
Moving a subdisk copies the disk space contents of a subdisk onto one or more other
subdisks. If the subdisk being moved is associated with a plex, then the data stored on the
original subdisk is copied to the new subdisks. The old subdisk is dissociated from the
plex, and the new subdisks are associated with the plex. The association is at the same
offset within the plex as the source subdisk. To move a subdisk, use the following
command: