Disk replacement scenarios

This document describes the common scenarios for replacing failed disk on ElastiStor Node.

If a disk in a Pool fails, ElastiCenter displays the bad disk as shown in the following screen:

bad_disk_detection1

Manual disk replacement

  • Free-labeled disk: An unused, labeled disk in the disk array enclosure.
  • The disk is not part of any Pool.
  • A free-labeled disk does not serve as a spare unless it is configured to be spare.
  • The disk may be used to manually replace the failed disk using ElastiCenter.
  • Can be performed using ElastiCenter.

Automatic disk replacement

  • Spare: A disk or a group of disks used to replace failing/failed disks in a RAID configuration.
  • If one data disk on the Pool fails, the spare is kicked in automatically on removal of the failed disk.
  • A free-labeled disk has to be configured as spare to automatically replace a failed disk. For details, see Configuring Spare.

Note: A new disk is termed as free-labeled disk after you label it using ElastiCenter. For details, see Configuring Disk Array enclosure.

The following sections explain the disk replacement scenarios.

Scenario 1: You have free labeled disks

Perform the following procedures using ElastiCenter.
  1. In ElastiCenter, select Pools (Navigation Pane > Pools).
  2. In the Pools page, select the Pool where the disk failed.
  3. In the Actions pane, click Manage RAID Configuration. The Disk Group page appears.
  4. In the Disk Groups page, select a Disk Group where you want to replace the disk.
  5. (Optional) If the disk is online,
    • Click the disk offline icon.
    • At prompt, click Yes.
  6. disk_replacement
  7. The red icon in State in Pool indicates that the disk is offline or bad.
  8. disk_offline
  9. For the offline disk, click the replace icon.
  10. disk_replacement_icon

  11. Select a disk from the drop-down list and then click OK.
  12. selct_disk_drop_down

Scenario 2: You have spare disk configured

Manually remove the failed disk from the Disk Array Enclosure.

The spare is kicked in automatically in the place of the failed disk (which you removed).

Scenario 3: You do not have a spare disk or additional free disks

  1. Manually replace the failed disk with a new disk in the Disk Array Enclosure.
  2. Go to Nodes page (Navigation pane > Nodes).
  3. Click Refresh Storage.
  4. Label the new disk. For details, see the section Configuring Disk Array enclosure.
  5. Perform the procedures in Scenario 1: You have free labeled disks.