Making SAN changes for IBM® pSeries hosts

Before you change the switch port that is connected to the storage unit or the switch domain ID, perform the steps in this section to remove the fibre-channel adapter.

Note: The 1905, 1910, 1957, 1977, 5716, 5758, 5759, 6228, and 6239 host adapters do not support dynamic SAN configuration changes. Do not change the domain ID of the switch port of the switch connected to the storage unit; otherwise, you might lose the connection to the storage unit.

Complete the following steps on a pSeries host to remove the fibre-channel adapter before changing a switch port:

  1. Run the umount command to unmount all applicable file systems.

    For example, type umount x, where x is the file system name. If you are on an SP host, go to step 2; otherwise, go to step 4.

  2. For SP™ environments, type suspendvsd to suspend the virtual shared disks with the volume groups.
  3. For SP environments, type stopvsd to stop the virtual shared disks that are associated with the volume groups.
  4. Run the varyoffvg command for the 1750 volume group.

    For example, type varyoffvg VGname.

  5. Type rmdev -dl fcs(x) -R on the command line to remove the fibre-channel adapter. The value of x represents the fibre-channel number that you want to remove.
  6. Make all required San changes.
  7. Type cfgmgr to reinstall the adapter and rediscover the 1750 hdisks.
  8. Type varyonvg to vary on the volume groups.
  9. Run the mount command to remount all applicable file systems.
Parent topic: Attaching a pSeries or RS/6000 host
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