VERITAS Storage Foundation 4.1 Cross-Platform Data Sharing Administrator's Guide

Creating CDS Disk Groups Using vxdg split
34 VERITAS Storage Foundation CDS Administrator’s Guide
Creating CDS Disk Groups Using vxdg split
You can use the vxdg split command to create a CDS disk group from an existing CDS disk
group. The new (target) and original (source) disk group retain the same CDS attribute; that is, if
the source is CDS, then the new disk group is also CDS. The new disk group also has the same
alignment as the original disk group. Refer to the VERITAS Volume Manager Adminstrator’s Guide
for examples of using this command.
Note This command is not supported for the Solaris OS on the X86 platform.
Additional Considerations When Importing CDS Disk Groups
Before attempting to use CDS to move disk groups between different operating systems, there are
several points that you should consider if the configuration of the disks has changed since the target
system was last rebooted:
◆ Does the target system know about the disks? For example, the disks may not have been
connected to the system either physically (not cabled) or logically (using FC zoning or LUN
masking) when the system was booted up, but they have subsequently been connected without
rebooting the system. This can happen when bringing new storage on-line, or when adding an
additional DMP path to existing storage. On the target system, both the operating system and
VxVM must be informed of the existence of the new storage. On Linux, depending on the
supported capabilities of the host adapter, you may need to reboot the target system to achieve
this. For other operating systems, issue the appropriate command to tell the operating system to
look for the storage. Having done this, run either of the following commands on the target
system to have VxVM recognize the storage:
# vxdctl enable
# vxdisk scandisks
◆ Do the disks contain partitions or slices? Both Solaris and Linux systems maintain information
about partitions or slices on disks. If you repartition a disk after the target system was booted,
use the appropriate command to instruct the operating system to rescan the disk’s TOC or
partition table. For example, on a target Linux system, use the following command:
# blockdev --rereadpt
Having done this, run either of the following commands on the target system to have VxVM
recognize the storage:
# vxdctl enable
# vxdisk scandisks