Migrating to IBM Spectrum Scale V4.2 from GPFS V3.5

Node-at-a-time migration is not available when you migrate a cluster to IBM Spectrum Scale™ V4.2 from GPFS™ V3.5. You must shut down the cluster and migrate all the nodes at once. If this method is not acceptable, you might consider migrating in two steps: first migrate the cluster from GPFS V3.5 to GPFS V4.1, and then migrate from GPFS V4.1 to IBM Spectrum Scale 4.2.

To migrate a cluster to Spectrum Scale V4.2 from GPFS V3.5, follow these steps:

1. Stop all user activity in the file systems.

   For information about how to stop and then unmount NFS running over GPFS file systems, see Unmounting a file system after NFS export in IBM Spectrum Scale: Administration and Programming Reference.

2. Cleanly unmount the mounted GPFS file system. Do not use force unmount.

   For more information, see mmumount command in IBM Spectrum Scale: Administration and Programming Reference.

3. Follow any local administrative backup procedures to ensure protection of your file system data in the event of a failure.
4. Stop GPFS on all nodes in the cluster. For example:

   mmshutdown -a

5. For each node, run the appropriate uninstall program
   • For example, for Linux nodes:

     rpm -e gpfs.gpl gpfs.base gpfs.docs gpfs.msg.en_US gpfs.ext gpfs.crypto

   • For AIX® nodes:

     installp -u gpfs

   • For Windows nodes, open the "Uninstall or change a program window" by clicking Start > Control Panel > Programs and Features and uninstall the IBM® General Parallel File System.
     Note: To upgrade a GPFS V3.5 Windows node (SUA-based) to IBM Spectrum Scale Standard Edition V4.2 (Cygwin 64-bit based), follow these steps:

     1. Uninstall GPFS V3.5 and reboot.
     2. Uninstall the GPFS V3.5 license.
     3. Disable any SUA daemon, such as OpenSSH, that might have been configured. Do not uninstall SUA yet, or you might lose GPFS configuration information.
     4. Install the 64-bit version of Cygwin. For more information, see the help topic Installing the 64-bit version of Cygwin.
     5. Copy the installation images and install the IBM Spectrum Scale licensed program as described in Installing IBM Spectrum Scale on Windows nodes.
     6. Uninstall SUA completely.
6. For each node, copy the installation images and install the IBM Spectrum Scale licensed program as described in Installing GPFS on Linux nodes, Installing IBM Spectrum Scale on AIX nodes, or Installing IBM Spectrum Scale on Windows nodes.
7. Start GPFS on the cluster. For example:

   mmstartup -a

8. Mount the file systems if they are not mounted automatically when the GPFS daemon starts.