VERITAS Volume Manager 4.1 Administrator's Guide

Creating and Administering Subdisks

Associating Subdisks with Plexes

Chapter 5 205

create a subdisk of a size that ﬁts the hole in the sparse plex exactly.

Then, associate the subdisk with the plex by specifying the offset of the

beginning of the hole in the plex, using the following command:

# vxsd -l offset assoc sparse_plex exact_size_subdisk

NOTE The subdisk must be exactly the right size. VxVM does not allow the

space deﬁned for two subdisks to overlap within a plex.

For striped or RAID-5 plexes, use the following command to specify a

column number and column offset for the subdisk to be added:

# vxsd -l column_#/offset assoc plex subdisk ...

If only one number is speciﬁed with the -l option for striped plexes, the

number is interpreted as a column number and the subdisk is associated

at the end of the column.

Alternatively, to add M subdisks at the end of each of the N columns in a

striped or RAID-5 volume, you can use the following form of the vxsd

command:

# vxsd assoc plex subdisk1:0 ... subdiskM:N-1

The following example shows how to append three subdisk to the ends of

the three columns in a striped plex, vol-01

# vxsd assoc vol01-01 disk10-01:0 disk11-01:1 disk12-01:2

If a subdisk is ﬁlling a “hole” in the plex (that is, some portion of the

volume logical address space is mapped by the subdisk), the subdisk is

considered stale. If the volume is enabled, the association operation

regenerates data that belongs on the subdisk. Otherwise, it is marked as

stale and is recovered when the volume is started.