The following restrictions apply when deleting a DRD-VOL with capacity saving enabled:
- Even if a DRD-VOL whose capacity saving setting is deduplication and compression is deleted, the duplicate data might be kept in the pool. For this reason, the free space in the pool might not increase.
- To delete a DRD-VOL, use the raidcom delete ldev command. The DRD-VOL deletion might take several hours to complete. The DRD-VOL deletion cannot be canceled during the LDEV deletion.
- If a DRD-VOL is deleted, the capacity saving status of the deleted DRD-VOL changes to Deleting Volume, and then the processing progress rate is displayed.
- The time required to delete a DRD-VOL varies depending on the device configuration, data layout, or data contents.
If you want to delete a V-VOL with the data direct mapping attribute, perform the following operations in advance:
- Block the V-VOL with the data direct mapping attribute to be deleted by using the raidcom modify ldev command.
- Disconnect the connection from an external storage system volume mapped to an external volume with the data direct mapping attribute that is associated with the V-VOL blocked in step 1.
By disconnecting the volume on the external storage system, SIMRC=627xxx (xxx is the pool ID) might be output. This message indicates that the pool-VOL is blocked.
When the volume on the external storage system is disconnected, the cached data on the local storage system is written to the volume on the external storage system.
If you do not need data guarantee for the volume on the external storage system because the external storage system has already been removed, you can set SOM 1083 to ON to delete the V-VOL with the data direct mapping attribute without disconnecting the volume on the external storage system.
If SOM 1083 is set to ON, restore SOM 1083 back to OFF after deleting the V-VOL with the data direct mapping attribute.
After you delete a DRD-VOL for which capacity saving is enabled, if you perform other operations during or just after the DRD-VOL deletion processing, those operations might fail. If this occurs, wait for a while, and then retry those operations.
The LDEV deletion process is suspended when the size of the used capacity of a pool reaches the depletion threshold. If this occurs, you must resolve the causes of the SIM message. When enough pool capacity is ensured, the deletion process will start again.
You can convert one LDEV (CV) or more into free space by deleting an LDEV being used. If an LDEV is deleted, the user data is also lost. Make sure to back up the data before the LDEV deletion. If you want to delete a registered external volume, see the VSP One Block Universal Volume Manager User Guide.