Replace SAS controller or adapter

This topic describes the procedures for replacing SAS controller card or adapter.

Perform the following steps:
  1. Follow steps 1 through 5 as described in Manual online upgrade of IBM Storage Scale Erasure Code Edition.
    Note: The same type of card or adapter is recommended for replacement. Card or adapter that has a different speed might introduce performance issues.

    If the SAS controller need replacement is failed and caused the disks that belong to the controller are missing, the recovery group fault tolerance might be degraded. If the left fault tolerance is lower than one node + one pdisk, contact IBM® support to make sure you can shut down the node online.

  2. Disable GPFS autostart by issuing the following command:
    mmchconfig autoload=no
  3. Shut down and power off the node.
  4. Follow instructions of the server manufacturer to replace the SAS card.
  5. Power® on and then start the node.
  6. Check the disks with storcli or perccli command and set the disk in JBOD mode if needed.
  7. Verify the disk slot location by following the steps in Mapping LMR disk location.
  8. Check the disk write cache and disable it if needed. For more information, see Hardware checklist.
  9. Run the OS precheck tool again and make sure that the test is passed.
  10. Change the autoload config back to "yes".
    mmchconfig autoload=yes
  11. Perform steps 7 through 9 as described in Manual online upgrade of IBM Storage Scale Erasure Code Edition.