You can use the SAN Volume Controller Console to
make a target or auxiliary virtual disk (VDisk) the same size as the
source or master VDisk when you create FlashCopy® mappings, Metro
Mirror relationships, or Global Mirror relationships.
You can shrink a VDisk from the Shrinking Virtual Disks
panel in the SAN Volume Controller Console.
Shrinking a VDisk reduces its total capacity. Use this function when
you want a FlashCopy® target
disk to have the same capacity as its source. However, if the VDisk
contains data, do not shrink the size of the disk.
Attention: - The SAN Volume Controller arbitrarily
reduces the capacity of the VDisk by removing one or more extents
from those that are allocated to the VDisk. You cannot control which
extents are removed so you cannot guarantee that it is unused space
that is removed.
- If the VDisk contains data that is being used, but you still want
to reduce its size, ensure that you back up your data before you attempt
this operation.
- If the VDisk is being used by hosts, ensure that the target VDisk
is not mapped to any hosts before you shrink the VDisk.
This task assumes that you have already launched the SAN Volume Controller Console.
Perform
the following steps to shrink a VDisk:
- Click in the portfolio.
The Viewing Virtual Disks panel is displayed.
- Select the VDisk to shrink and select Shrink
a VDisk from the task list. Click Go.
The Shrinking Virtual Disks panel is displayed.
- Enter the capacity to reduce the size of the VDisk by in
the Reduce By Capacity field and click OK.