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Dell PowerVault ME4 Series Storage System Administrator’s Guide

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Removing disk groups

You can delete a single disk group or select multiple disk groups and delete them in a single operation. By removing disk groups, you can also remove pools. Removing all disk groups within a pool will also trigger the automatic removal of the associated pool.

If all disk groups for a pool have volumes assigned and are selected for removal, a confirmation panel will warn the user that the pool and all its volumes will be removed. For linear disk groups, this is always the case since linear pools can only have one disk group per pool.

Unless a virtual pool consists exclusively of SSDs, if a virtual pool has more than one disk group and at least one volume that contains data, the system attempts to drain the disk group to be deleted by moving the volume data that it contains to other disk groups in the pool. When removing one or more, but not all, disk groups from a virtual pool, the following possible results can occur:
  • If the other disk groups do not have room for the data of the selected disk group, the delete operation will fail immediately and a message will be displayed.
  • If there is room to drain the volume data to other disk groups, a message will appear that draining has commenced and an event will be generated upon completion (progress will also be shown in the Current Job column of the Related Disk Groups table).
    • When the disk group draining completes, an event will be generated, the disk group disappears, and the drives for it becomes available.
    • If a host writes during the disk group draining, which results in there not being enough room to finish the draining, an event will be generated, the draining terminates, and the disk group will remain in the pool.
NOTE:Disk group removal (draining) can take a very long time depending on a number of factors in the system, including but not limited to: large pool configuration; the amount of I/O traffic to the system (e.g., active I/O pages to the draining disk group); the type of the disk group page migration (enterprise SAS, midline SAS, SSD); the size of the draining disk group(s) in the system; and the number of disk groups draining at the same time.

If you remove the last disk group in a virtual pool, the system will prompt you to confirm removing the pool, too. If you choose yes, the pool will be removed. If you choose no, the disk group and the pool will remain.

NOTE:If the disk group is the last disk group for a pool that is used in a peer connection or it contains a volume that is used in a replication set, the Remove Disk Groups menu option will be unavailable.

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