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The volume Change Layout procedure changes
the layout of a volume without interrupting access to data. You
can use this task to change the redundancy or performance characteristics
of an existing volume. You can view the progress of the relayout task through the
Relayout Status Monitor window. You can also use the Relayout Status
Monitor window to pause, abort, continue, or reverse the relayout
task. The Relayout Status Monitor appears automatically when a relayout
task begins. When a volume relayout is in progress, paused, or aborted,
you can also access the Relayout Status Monitor through the Volume
Properties window. Procedure 4-4 To
change a volume layout Select the volume to be changed to a different layout. Choose Actions > Change Layout. Complete the Change Volume Layout dialog box as follows: Volume Name: | If the correct volume name does not already
display in this field, enter the volume name. | Layout: | Choose the new volume layout (Concatenated, Striped, RAID-5, Concatenated Pro, or Striped Pro.) For a striped, RAID-5, or striped pro
volume, provide the following information: In the Number of Columns field, specify the number of
columns (disks) across which the volume should be striped. The stripe unit size in the Stripe Unit Size field.
To specify a size unit, attach an s (sectors), k (kilobytes), m
(megabytes), or g (gigabytes) to the size.
| Options: | Click Show Options to access the optional settings for this task. To retain the original volume size when the volume layout
changes, click Retain volume size at completion. To specify the size of the pieces of data that are copied
to temporary space during the volume relayout, enter the size in
the Temp space size field. To specify additional disk space to be used for
the new volume layout (if needed), specify the disk in the disk(s)
field . To specify the temporary disk space to be used during
the volume layout change, specify the disk in the temp disk(s) field. If the volume contains plexes with different layouts, specify
the plex to be changed to the new layout in the Target Plex field.
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After you have provided all necessary information in
the dialog box, click OK. The Relayout Status Monitor window appears. This window
provides you with the following information: Volume Name: | The name of the volume that is undergoing
a layout change. | Initial Layout: | The original layout of the volume. | Desired Layout: | The new layout for the volume. | Status: | The status of the relayout task. | % Complete: | The progress of the relayout task. |
If you need to pause, abort, continue, or reverse a relayout
task after you close the Relayout Status Monitor window, you can
access the Relayout Status Monitor through the Volume Properties window.
| | | |  | NOTE: The Volume
Change Layout task requires a volume name and a different
volume layout. Volumes remain accessible during online relayout. This task may take a long time, depending on the
volume size and other factors. The Relayout Status Monitor shows
the progress of the layout change and allows you to abort, pause,
or reverse the task. If no disk space is specified, VxVM uses available
space on disks in the current disk group. If the temporary space size is not specified, VxVM
uses an appropriate size. Specifying a larger temporary space size
speeds up the layout change process because larger pieces of data
are copied at a time. If the specified temporary space size is too
small, VxVM uses a larger size. If all of the plexes in the volume have identical
layouts, VxVM changes all plexes (except log plexes) to the new
layout. If the volume contains plexes with different layouts, a
target plex must be specified. When a target plex is specified,
VxVM changes the layout of the target plex and leaves the other
plexes in the volume alone. Log plex layouts do not change. VxVM removes and/or
replaces log plexes, depending on the new layout. If the volume length changes as a result of the
layout change and the volume contains a file system, the file system
length is automatically adjusted (if possible). A volume cannot undergo multiple relayouts at the
same time. This task cannot be used to change the layout of
a volume with a sparse plex. This task may fail for volumes that were not created
by VxVM or the vxassist command. If the relayout is reversed, the volume returns
to its original layout. However, data in the volume may not return
to its original storage location. During a relayout, many other tasks are unavailable
for the volume. A mirrored or striped volume requires at least two
disks. A RAID-5 volume requires at least three disks.
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