Veritas Storage Foundation Portable Data Containers: Cross-Platform Data Sharing 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

If you use the vxencap command to perform the encapsulation, the alignment is
carried out automatically without a confirmation prompt.
To change the alignment of a disk group during disk encapsulation
■ Run the vxdiskadm command, and select the “Add or initialize one or
more disks” item from the main menu. As part of the encapsulation process,
you are asked to confirm that a reduction of the disk group alignment from
8K to 1 is acceptable.
Changing the alignment of a non-CDS disk group
The alignment value can only be changed for disk groups with version 110 or
greater.
For a CDS disk group, alignment can only take a value of 8k. Attempts to set the
alignment of a CDS disk group to 1 fail unless you first change it to a non-CDS
disk group.
Increasing the alignment may require vxcdsconvert to be run to change the layout
of the objects in the disk group.
To display the current alignment value of a disk group, use the vxprint command.
See “Displaying the disk group alignment” on page 41.
To change the alignment value of a disk group
■ Type the vxdg set command:
# vxdg -g diskgroup set align={1|8k}
The operation to increase the alignment to 8K fails if objects exist in the disk
group that do not conform to the new alignment restrictions. In that case, use
the vxcdsconvert alignment command to change the layout of the objects:
# vxcdsconvert -g diskgroup [-A] [-d defaults_file] \
[-o novolstop] alignment [attribute=value] ...
This command increases the alignment value of a disk group and its objects
to 8K, without converting the disks.
The sequence 8K to 1 to 8K is possible only using vxdg set as long as the
configuration does not change after the 8K to 1 transition.
See “Converting a non-CDS disk group to a CDS disk group” on page 25.
Maintaining your system
Disk group tasks
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