You can convert one or more of the LDEVs on a selected RAID group into free space by deleting the LDEVs. That free space can be used to either create one or more custom-size volumes (CVs) using the Create LDEVs function or left as free space for future use.
Deleting LDEVs erases your data. Back up your data before deleting LDEVs.
The amount of used pool capacity cannot be reduced by deleting LDEVs. To reduce the amount of used pool capacity, format the target LDEVs.
If you try to delete a volume soon after you perform any of the following operations on that volume, deletion of the volume might fail. If deletion of the volume fails, confirm that the write-pending rate (%) for the MP unit to which the volume to be deleted is assigned is lower than 70%, wait for about 10 minutes and then try the operation again.
- Changing MP unit assignment for a volume
- Deleting a ShadowImage for Mainframe pair
- Deleting a journal volume of Universal Replicator for Mainframe
- Migrating a volume by using Volume Migration
The following LDEVs cannot be deleted:
- Pair volumes (for example, TrueCopy for Mainframe and Universal Replicator software for Mainframe)
- Pool-VOLs
- Journal volumes
- LDEVs that have the Read/Write access attribute
When you delete an LDEV, the PAV alias information contained in the LDEV is also deleted. Therefore, if you delete an LDEV related to a PAV alias device, do one of the following:
- Allocate another LDEV to the alias device, and then delete the LDEV.
- Delete the LDEV first, and then allocate another LDEV to the alias device.
For information about how to delete an external volume, see the Universal Volume Manager User Guide.