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[Read This Fine Material] from Joshua Hoblitt

How to disable GPFS’ cNFS feature

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Check to see the current status of cNFS:

[root@foonsd1 ~]# mmlscluster --cnfs

GPFS cluster information
========================
  GPFS cluster name:         fooamcp.example.org
  GPFS cluster id:           10159024612008204251

Cluster NFS global parameters
-----------------------------
  Shared root directory:                /net/foodata1/cnfsSharedRoot
  Virtual IP address:                   foonfs.example.org
  rpc.mountd port number:               892
  nfsd threads:                         128
  Reboot on failure enabled:            yes
  CNFS monitor enabled:                 yes

 Node  Daemon node name            IP address       CNFS state  group  CNFS IP address list
-------------------------------------------------------------------------------------------
  16   foonsd1.example.org        140.252.27.15    enabled        0   140.252.27.10,140.252.27.12
  17   foonsd2.example.org        140.252.27.16    disabled       0   140.252.27.11,140.252.27.13

We can either just disable the one active cNFS node like this:

[root@foonsd1 ~]# mmchnode --cnfs-disable -N  foonsd1,foonsd2
Mon Mar 25 17:16:15 MST 2013: mmchnode: Processing node foonsd1.example.org
Mon Mar 25 17:16:15 MST 2013: mmchnode: Processing node foonsd2.example.org
mmchnode: Propagating the cluster configuration data to all
  affected nodes.  This is an asynchronous process.

Or disable cNFS permanently but deleting it’s configuration. Note that when your permanently removing the cNFS configuration it’s not necessary to first disabled it.

[root@foonsd1 ~]# mmchnode --cnfs-interface=DELETE -N foonsd1,foonsd2
Mon Mar 25 17:16:43 MST 2013: mmchnode: Processing node foonsd1.example.org
Mon Mar 25 17:16:43 MST 2013: mmchnode: Processing node foonsd2.example.org
mmchnode: Propagating the cluster configuration data to all
  affected nodes.  This is an asynchronous process.

Verifying that cNFS is now disabled:

[root@foonsd1 ~]# mmlscluster --cnfs

GPFS cluster information
========================
  GPFS cluster name:         fooamcp.example.org
  GPFS cluster id:           10159024612008204251

mmlscluster:  CNFS is not defined in this cluster.

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