Veritas Storage Foundation Cross-Platform Data Sharing 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

24 Setting up your system
Converting a non-CDS disk group to a CDS disk group
The alignment and group keywords have the following effect
:
The conversion involves evacuating objects from the disk, reinitializing the
disk, and relocating objects back to disk. You can specify the
-o novolstop
option to perform the conversion on-line (that is, while access to the disk
group continues). If the
-o novolstop option is not specified, stop any
applications that are accessing the disks, and perform the conversion
off-line.
Warning: Specifying the -o novolstop option can greatly increase the
amount of time that is required to perform conversion.
In the following example, the disk group,
anodg, and all its disks are
converted to CDS while keeping its volumes are still online:
# vxcdsconvert -g anodg -o novolstop group \
move_subdisks_ok=yes evac_subdisks_ok=yes \
evac_disk_list=anodg11,anodg12,anodg13,anodg14
The evac_disk_list attribute specifies a list of disks (nodg11 through
anodg14) to which subdisks can be evacuated to disks if required.
Before you use the
vxcdsconvert command, make sure you understand its
options, attributes, and keywords.
See the
vxcdsconvert(1M) manual page.
Side effects of conversion
Conversion has the following side effects:
■ Non-CDS disk group are upgraded by using the vxdg upgrade
command. If the disk group was originally created by the conversion of
an LVM volume group (VG), rolling back to the original LVM VG is not
possible. If you decide to go through with the conversion, the rollback
records for the disk group will be removed, so that an accidental
rollback to an LVM VG cannot be done.
alignment Specifies alignment conversion where disks are not converted, and an
object relayout is performed on the disk group. A successful
completion results in an 8K-aligned disk group. You might consider
this option, rather than converting the entire disk group, if you want
to reduce the amount of work to be done for a later full conversion to
CDS disk group.
group Specifies group conversion of all non-CDS disks in the disk
groupbefore realying out objects in the disk group.