Removing Existing NSD Nodes from GPFS Cluster


Removing existing NSD Nodes from the GPFS Cluster is not difficult, but there are several steps to take note of.

Step 1: Check and make sure the NSD Nodes you are removing are not quorum-manager.

See Removing Quorum Manager from NSD Nodes

Step 2: Check that Quorum-Manager have been removed from the old NSD

# mmlscluster

GPFS cluster information
========================
GPFS cluster name:         mygpfs.gpfsnsd1
GPFS cluster id:           720691660936079521
GPFS UID domain:           mygpfs.gpfsnsd1
Remote shell command:      /usr/bin/ssh
Remote file copy command:  /usr/bin/scp

GPFS cluster configuration servers:
-----------------------------------
Primary server:    newnsd3
Secondary server:  newnsd4
.....
.....
.....
.....
714   oldnsd1          192.168.111.5   oldnsd1
715   oldnsd2          192.168.111.6   oldnsd2
716   newnsd3          192.168.111.7   newnsd3         quorum-manager
717   newnsd4          192.168.111.8   newnsd4         quorum-manager

Step 3a: Umount the GPFS File System

# mmumount all -a

Step 3b: Check all the GPFS nodes have been unmounted

# mmlsmount all

File system gpfs0 is mounted on 0 nodes.

Step 4: Displays Network Shared Disk (NSD) information for the GPFS cluster.

# mmlsnsd

File system   Disk name    NSD servers
---------------------------------------------------------------------------
gpfs0         dcs3700A_2   File system   Disk name    NSD servers
---------------------------------------------------------------------------
gpfs0         dcs3700A_2   newnsd3,oldnsd1
gpfs0         dcs3700A_3   newnsd3,oldnsd1
gpfs0         dcs3700A_4   newnsd3,oldnsd1
gpfs0         dcs3700A_5   newnsd3,oldnsd1
gpfs0         dcs3700A_6   newnsd3,oldnsd1
gpfs0         dcs3700A_7   newnsd3,oldnsd1
gpfs0         dcs3700B_2   newnsd4,oldnsd2
gpfs0         dcs3700B_3   newnsd4,oldnsd2
gpfs0         dcs3700B_4   newnsd4,oldnsd2
gpfs0         dcs3700B_5   newnsd4,oldnsd2
gpfs0         dcs3700B_6   newnsd4,oldnsd2
gpfs0         dcs3700B_7   newnsd4,oldnsd2

Step 5: Changes Network Shared Disk (NSD) configuration attributes.

# mmchnsd dcs3700A_2:newnsd3

To confirm the changes, issue this command:

# mmlsnsd -d dcs3700A_2
File system   Disk name    NSD servers
---------------------------------------------------------------------------
 gpfs0         dcs3700A_2   newnsd3

Do for the rest…..

# mmchnsd dcs3700A_3:newnsd3
# mmlsnsd -d dcs3700A_3
# mmchnsd dcs3700A_4:newnsd3
# mmlsnsd -d dcs3700A_4
# mmchnsd dcs3700A_5:newnsd3
# mmlsnsd -d dcs3700A_5
# mmchnsd dcs3700A_6:newnsd3
# mmlsnsd -d dcs3700A_6
# mmchnsd dcs3700A_7:newnsd3
# mmlsnsd -d dcs3700A_7
# mmchnsd dcs3700B_2:newnsd4
# mmlsnsd -d dcs3700B_2
# mmchnsd dcs3700B_3:newnsd4
# mmlsnsd -d dcs3700B_3
# mmchnsd dcs3700B_4:newnsd4
# mmlsnsd -d dcs3700B_4
# mmchnsd dcs3700B_5:newnsd4
# mmlsnsd -d dcs3700B_5
# mmchnsd dcs3700B_6:newnsd4
# mmlsnsd -d dcs3700B_6
# mmchnsd dcs3700B_7:newnsd4
# mmlsnsd -d dcs3700B_7

Step 6: Remove Old NSD Nodes

Once you have confirmed that the NSD nodes are ok.

# mmdelnode -N oldnsd1,oldnsd2

Verify that the old NSD nodes are no more in the cluster

# mmlscluster

Step 7: Remount the File System

# mmmount all -a

References:

  1. General Parallel File System
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