Disk device name is an existing NSD name

Learn how to respond to an NSD creation error message in which the device name is an existing NSD name.

When you run the mmcrnsd command to create an NSD, the command might display an error message saying that a DiskName value that you specified refers to an existing NSD name.

This type of error message indicates one of the following situations:
  • The disk is an existing NSD.
  • The disk is a previous NSD that was removed from the cluster with the mmdelnsd command but is not yet marked as available.
In second situation, you can override the check by running the mmcrnsd command again with the -v no option. Do not take this step unless you are sure that another cluster is not using this disk. Enter the following command:
mmcrnsd -F StanzaFile -v no
A possible cause for the NSD creation error message is that a previous mmdelnsd command failed to zero internal data structures on the disk, even though the disk is functioning correctly. To complete the deletion, run the mmdelnsd command with the -p NSDId option. Do not take this step unless you are sure that another cluster is not using this disk. The following command is an example:
mmdelnsd -p NSDId -N Node