VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 8, Administering Volumes

Performing Online Relayout

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that no snap objects are associated with volume v2 or with its snapshotvolume SNAP-v2.

See “How Persistent FastResync Works with Snapshots” on page 45 for more information

about snap objects.

If a volume is speciﬁed, the snapprint command displays an error message if no

FastResync maps are enabled for that volume.

Performing Online Relayout

Note You may need an additional license to use this feature.

You can use the vxassist relayout command to reconﬁgure the layout of a volume

without taking it ofﬂine. The general form of this command is:

# vxassist [-b] [-g diskgroup] relayout volume [layout=layout] \

[relayout_options]

Note If speciﬁed, the -b option makes relayout of the volume a background task.

The following are valid destination layout conﬁgurations as determined by the tables in

“Permitted Relayout Transformations” on page 35:

concat-mirror—concatenated-mirror

concat or span, nostripe, nomirror—concatenated

raid5—RAID-5 (not supported for shared disk groups)

stripe—striped

stripe-mirror—striped-mirror

For example, the following command changes a concatenated volume to astriped volume

with the default number of columns, 2, and stripe unit size, 64k:

# vxassist relayout vol02 layout=stripe

On occasions, it may be necessary to perform a relayout on a plex rather than on a

volume. See “Specifying a Plex for Relayout” on page 222 for more information.

Specifying a Non-Default Layout

You can specify one or more relayout options to change the default layout conﬁguration.

Examples of these options are:

ncol=number—speciﬁes the number of columns

ncol=+number—speciﬁes the number of columns to add