GPFS: Administration and Programming Reference - IRA Home

mmdelnsd Command
Name
mmdelnsd – Deletes Network Shared Disks (NSDs) from the GPFS cluster.
Synopsis
mmdelnsd {″DiskName[;DiskName...]″ | -F DiskFile}
Or,
mmdelnsd -p NSDId [-N {Node[,Node] }]
Description
The mmdelnsd command serves two purposes:
1. Delete NSDs from the GPFS cluster.
2. Remove the unique NSD volume ID left on the disk after the failure of a previous invocation of the
mmdelnsd command. The NSD had been successfully deleted from the GPFS cluster but there was a
failure to clear sector 2 of the disk.
The NSD being deleted cannot be part of any file system. Either the mmdeldisk or mmdelfs command
must be issued prior to deleting the NSD from the GPFS cluster.
The NSD being deleted cannot be a tiebreaker disk. Use the mmchconfig command to assign new
tiebreaker disks prior to deleting the NSD from the cluster. For information on tiebreaker disks, see quorum
Results
Upon successful completion of the mmdelnsd command, these tasks are completed:
v All references to the disk are removed from the GPFS cluster data.
v Sector 2 of the disk is cleared of the unique NSD volume ID.
Parameters
DiskName[;DiskName...]
Specifies the names of the NSDs to be deleted from the GPFS cluster. Specify the names
generated when the NSDs were created. Use the mmlsnsd -F command to display disk names. If
there is more than one disk to be deleted, delimit each name with a semicolon (;) and enclose the
list of disk names in quotation marks.
-F DiskFile
Specifies a file containing the names of the NSDs, one per line, to be deleted from the GPFS
cluster.
-N Node[,Node]
Specifies the nodes to which the disk is attached. If no nodes are listed, the disk is assumed to be
directly attached to the local node. Only one or two nodes may be specified with the -N flag.
For general information on how to specify node names, see “Specifying nodes as input to GPFS
commands” on page 4.
-p NSDId
Specifies the NSD volume ID of an NSD that needs to be cleared from the disk as indicated by
the failure of a previous invocation of the mmdelnsd command.
Chapter 8. GPFS commands 161