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How to setup user managed GPFS cluster using db2cluster utility.

Question & Answer


Question

1. How to setup GPFS cluster using db2cluster utility on your system. 2. How to clean the GPFS cluster manually from your system.

Answer

Creating a user managed GPFS cluster and FS using db2cluster command

  1. db2cluster -cfs -create -host <hostname1> -domain <domainname>
  2. db2cluster -cfs -add -host <hostname2> -domain <domainname>
  3. mmstartup -a
  4. db2cluster -cfs -create -filesystem <fsname> -disk <dev path> -mount <mount point>
  5. mmshutdown -a
  6. mmstartup -a
  7. Run 'mount' command on both the hosts in the cluster and check if the new filesystem is mounted on both machines.

    db2cluster -cfs -create -host Machine 1 -domain gpfsdomain
    db2cluster -cfs -add -host Machine 2 -domain gpfsdomain
    mmstartup -a
    db2cluster -cfs -create -filesystem gpfs1 -disk /dev/hdisk8 -mount /gpfs1

 
Manually cleaning a DB2 Managed Clustered File System and uninstalling GPFS

1. Unmount all GPFS file systems using the following command:
     /usr/lpp/mmfs/bin/mmumount all -a

2. Ensure the GPFS cluster is online:
    /usr/lpp/mmfs/bin/mmgetstate
    The output of this command should be similar to the following:

    Node Number  Node Name    GPFS state
    -----------   ----------     -----------
    1        Machine 1      active

3. Find the available file system(s):
    /usr/lpp/mmfs/bin/mmlsnsd
    The output of this command should be similar to the following:

    File system   Disk name     NSD servers
    -----------     ---------    -------------------
    db2fs1         db2disk1    (directly attached)


4. Delete the file system:
    /usr/lpp/mmfs/bin/mmdelfs db2fs1
    The output of this command should be similar to the following: All data on the following disks of db2fs1 will be destroyed: db2disk1 Completed deletion of file system /dev/db2fs1. mmdelfs: Propagating the cluster configuration data to all affected nodes: This is an asynchronous process.

5. Confirm that the file system has been deleted by rerunning the following command:
    /usr/lpp/mmfs/bin/mmlsnsd
    The output of this command should be similar to the following:


    File system Disk name NSD servers
    --------------------------------------------------------------------
    (free disk) db2disk1 (directly attached)

6. Stop the entire GPFS cluster:
    /usr/lpp/mmfs/bin/mmshutdown -a

7. Unset tiebreaker disk if the quorum type is tiebreaker:
    /usr/lpp/mmfs/bin/mmchconfig tiebreakerDisks=no

8. Delete NSD:
    /usr/lpp/mmfs/bin/mmdelnsd <disk name>

9. Verify the removal of NSD:
    /usr/lpp/mmfs/bin/mmlsnsd

    The output of this command should be similar to the following:

    mmlsnsd: No disks were found.

10. Delete the GPFS cluster:
    /usr/lpp/mmfs/bin/mmdelnode -a

    The output of this command should be similar to the following:

    Verifying GPFS is stopped on all affected nodes ...
    mmdelnode: Propagating the cluster configuration data to all affected nodes.
    This is an asynchronous process. mmdelnode: Command successfully completed.

11. Ensure that the GPFS has been removed:

/usr/lpp/mmfs/bin/mmlscluster
    The output of this command should be similar to the following:

    mmlscluster: This node does not belong to a GPFS cluster.
    mmlscluster: Command failed. Examine previous error messages to determine cause.

12. Run the db2_deinstall -a command to uninstall the GPFS binaries along with DB2 SD and TSA binaries.

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Document Information

Modified date:
16 June 2018

UID

swg21447939

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