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Knowledge Base

Automatic Reconstruction Failed on Degraded RAID Groups Due to Inconsistent Hot Spare Disk

Publication Date:  2012-07-22  |   Views:  191  |   Downloads:  0  |   Author:  anliku  |   Document ID:  EKB1000010750


Issue Description

SATA and FC disks are intermixed in the enclosures of the S5000 series, and one of the SATA disks is set as the hot spare disk. However, when a RAID group becomes degraded, the reconstruction is not automatically started on the hot spare disk.

Product and version information:
  • S5000 series

Alarm Information


Handling Process

  1. Reconfigure the hot spare disk and make sure it is an FC disk.
  2. Log in to the ISM, and unfold the node All RAID groups under the Logical tab.
  3. Right-click the degraded RAID group and choose Reconstruct Disk from the shortcut menu.

Root Cause

  1. It is found that the status of the hot spare disk is normal.
  2. However, the types of the hot spare disk and the member disks of the RAID group are inconsistent.
  • When the RAID group becomes degraded, the reconstruction cannot be started automatically on the hot spare disk due to its inconsistency with the member disks (FC disks) in the RAID group.


When FC and SATA disks are intermixed in a storage device, they do not support mutual replacement. Because of this, users have to set two hot spare disks individually, otherwise only one disk type (either FC or SATA in this case) of RAID group can be protected.