PowerStore: How to monitor a drive rebuild after replacement

Rebuilds explained

• The first is when a drive fails or is removed for over 5 minutes. This means that the drive is no longer part of the resiliency set and its data must be rebuilt to the spare space.
• The second is when the drive is replaced and assimilated back into the system. Its data must be restored or rebuilt back from the spare space.

• Within the first 5 minutes after a drive fails, the PowerStore tracks the new data that is written, and in case the same drive is connected back or recovers from the failure, a fast rebuild takes place by updating the drive with data written since the drive failed or was removed.
• After 5 minutes, the PowerStore stops tracking the delta and starts the rebuild process to restore redundancy by rebuilding the data from the failed drive into the spare space that is distributed across all surviving drives. Even if the same drive is reinserted back after 5 minutes, it will be considered a new drive.
  When the drive is restored or replaced, the PowerStore starts a full rebuild, meaning, the system restores all data back to the drive new drive.

How to monitor a drive rebuild from the PowerStore Manager user interface

1. From PowerStore Manager, select Hardware.
2. Select the appliance where you replaced the drive.
3. On the Components card, under Drives, expand BaseEnclosure and select the drive:
   • The status of the replacement drive should read Healthy.
   • If the status is still Faulted, wait a few minutes, and refresh PowerStore Manager to check again.
   • NOTE: Healthy drive status is not an indicator of RAID rebuild status.
4. Go to Monitoring > Events. Check the Events tab (Not Alerts) for the rebuilding status.
   Ensure that you see the rebuild finished event on both nodes.
   
5. It is not possible to estimate how long a rebuild may require as this depends on many factors, such as drive size, system activity levels, used capacity, and so on. Some drive rebuilds may take up to 5 hours.
   If the status does not change to healthy or you do not see that the rebuild finished event on both nodes after a while, contact Dell Technical Support or your Authorized Service Representative, and quote this knowledge base article ID.