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The Hard Disk RAID State Is PermDegrd

Publication Date:  2015-06-18 Views:  53 Downloads:  0
Issue Description
Hardware configuration:
An RH2285 configured with an LSISAS1068E controller card and two hard disks configured with RAID 1 properties

Symptom:

An RH2285 at the customer's site is configured with an LSISAS1068E controller card and two hard disks configured with RAID 1 properties. After the server operates for a period of time, the indicator for the hard disk in slot 1 is steady yellow, and the hard disk cannot be detected. The RAID state is PermDegrd. Manually set data synchronization for the new hard disks. The synchronization stops after operation for a period of time. Figure 1 shows the hard disk and RAID status.

Figure 1 PermDegrd RAID state

Handling Process
1.  After communication with LSI, the full name of PermDegrd is confirmed to be permanently degraded. The PermDegrd definition from LSI is as follows: after more than 64 consecutive bad blocks are recorded in the bad block table of the hard disk, the firmware identifies the RAID state of the hard disk to be PermDegrd, as shown in Figure 2.

Figure 2 PermDegrd definition from LSI



2.  After the RAID state becomes PermDegrd, the hard disk RAID cannot restore to the best state, and the hard disk cannot be configured to a new RAID with new hard disks.
Root Cause
Two hard disks of the server are damaged to different extent. A hard disk fails, and the number of bad blocks in the other hard disk nearly reaches the limit (64). When a hard disk is in this state, only read and write operations can be performed on the hard disk. However, the hard disk cannot be used to rebuild a RAID. As a result, data in the hard disk cannot be synchronized to a new hard disk.

Solution
Do not use a RAID that enters the permanently degraded state. Replace all hard disks in the RAID after backing up data for the hard disks, build a new RAID, and import the backup data.

END