Starting device parity protection with hot spare protection

This topic provides instructions for starting device parity protection with hot spare protection.

Note: Before proceeding with this section, read the Hot spare protection concepts and Planning for hot spare protection sections.

On the following Start Parity screens, only the device parity sets that can be protected by a hot spare are shown. If you do not see all the parity sets and IOAs expected, the system is unable to create the necessary hot spare devices required. Refer to the Troubleshooting hot spare protection section for possible reasons.

The process to start device parity with Hot Spare can only be performed when the partition is at the Dedicated Service Tool (DST) environment. For directions on starting DST, refer to "How to Start Dedicated Service Tools (DST)" in Backup and Recovery.

Follow these steps to start device parity protection with hot spare protection.

  1. On the Dedicated Service Tools (DST) display, select Work with disk units.
  2. On the Work with Disk Units display, select Work with disk configuration.
  3. On the Work with Disk Configuration display, select Work with device parity protection.
  4. On the Work with Device Parity Protection display, select Start device parity protection.
  5. On the Start Device Parity Protection display, select the type of RAID protection you want for the disk units; RAID 5 with hot spare, RAID 6 with hot spare, or RAID 10 with hot spare.
  6. On the Start Device Parity Protection display, select the Parity Sets that you want protection started on.
  7. On the Confirm Starting Device Parity Protection display, press Enter to confirm your choices.
Note: If a hot spare disk unit of the correct capacity exists for this IOA, any new device parity set is hot spare protected even if you do not select hot spare protection.
Note: If there is a sufficient number of hot spare disk units already available, the system will not create any additional hot spares.
Note: RAID 10 may leave an unprotected disk on each I/O bus when device parity with hot spare is started due to the requirement of two disks per parity set.