Decrease reserved capacity

You use the Decrease Capacity option to decrease the reserved capacity for the following storage objects: snapshot group, snapshot volume, and consistency group member volume. You can decrease reserved capacity only by the amount(s) you used to increase it.

Before you begin

The storage object must contain more than one reserved capacity volume.
The storage object must not be a mirrored pair volume.
If the storage object is a snapshot volume, then it must be a disabled snapshot volume.
If the storage object is a snapshot group, then it must not contain any associated snapshot images.

About this task

Review the following guidelines:

You can remove reserved capacity volumes only in the reverse order that they were added.
You cannot decrease the reserved capacity for a snapshot volume that is read-only because it does not have any associated reserved capacity. Only snapshot volumes that are read-write require reserved capacity.

Procedure

Select Storage > Pools & Volume Groups.
Click the Reserved Capacity tab.
Select the storage object for which you want to decrease reserved capacity, and then click Decrease Capacity.
The Decrease Reserved Capacity dialog box appears.
Select the capacity amount by which you want to decrease reserved capacity, and then click Decrease.

Result

System Manager performs the following actions:

Updates the capacity for the storage object.
Displays the newly updated reserved capacity for the storage object.
When you decrease capacity for a snapshot volume, System Manager automatically transitions the snapshot volume to a Disabled state. Disabled means that the snapshot volume is not currently associated with a snapshot image, and therefore, cannot be assigned to a host for I/O.