VERITAS Volume Manager 3.5 User's Guide - VERITAS Enterprise Administrator (September 2004)

Volume Tasks
Moving, Splitting, and Joining Subdisks
Chapter 4 151
Step 5. In the next screen that comes up, specify the subdisk size for the first of
the two subdisks and Click Next.
The remaining space left over will be assigned to the second subdisk. For
example, if the original subdisk was 100 MB and you assigned 40 MB to
the first subdisk, the other subdisk will be 60 MB.
Step 6. The final screen of the Subdisk Split wizard appears. Click Finish to
complete the command.
After a few moments, two subdisks will appear in the right pane of the
Volume Manager GUI.
NOTE
• The name of the first subdisk remains the same as the selected
subdisk. Other subdisks are automatically named by VxVM.
• The new, smaller subdisks occupy the same regions of the disk that
the original subdisk occupied.
• The original subdisk must contain a sufficient number of sectors for
the specified split to work.
• A Dirty Region Logging log subdisk cannot be split.
Joining a Subdisk
The Subdisk Join procedure joins two or more subdisks together to
form a single larger subdisk. Subdisks can only be joined together if they
belong to the same volume and occupy adjacent regions of the same disk
and mirror. You can join two subdisks that had been one subdisk but that
were split by the Subdisk Split command. You cannot split a subdisk
and join it back to another subdisk that it was not split from. There also
has to be room on the disk for the two subdisks.
You can use the Object View window (Disk Groups > Object View) or
the Volume to Disk Mapping window (Disk Groups > Disk/Volume
Map) to view the subdisks in a disk group. You can use the Volume Layout
Details window (Volumes > Show Layout) to view subdisks in a specific
volume.