MD RAID Array Status not Properly Updated on Removal of Last Component Device
This document (000021664) is provided subject to the disclaimer at the end of this document.
Environment
SUSE Linux Enterprise Server 12 SP5 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
SUSE Linux Enterprise Server 15 SP4 LTSS
SUSE Linux Enterprise Server 15 SP5 LTSS
Situation
On SLE 12 SP5 LTSS, md0 is running in a healthy status.
# mdadm -D /dev/md0
State : clean
...
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
2 8 48 1 active sync /dev/sdd
After all components of the array have failed, failure of the last MD RAID component is not reported correctly.
# mdadm -D /dev/md0
State : clean, degraded
...
Number Major Minor RaidDevice State
- 0 0 0 removed
2 8 48 1 active sync
The command report incorrect information:
- RAID status is "degraded"
- Disks status is "active sync"
instead of the expected information:
- RAID status is "FAILED"
- Disks status is "missing"
Resolution
The systems mentioned in "Environment section" will always have this restriction. Consider upgrading the system to newer SLE Version e.g. SLE 15 SP6.
Cause
Systems running older versions of SLE (before SLE15 SP6) have a kernel issue that prevents them from accurately displaying the status of an array when its last component is removed. This is because those older kernels lack certain fixes that were introduced in SLE15-SP6. Due to KABI restrictions, we cannot apply these fixes to the older systems.
Additional Information
Starting with SLE 15 SP6, failure of the last MD RAID component is reported correctly.
Array healthy.
# mdadm -D /dev/md0
State : clean
...
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
1 8 64 1 active sync /dev/sde
Array failed.
# mdadm -D /dev/md0
State : clean, FAILED
...
Number Major Minor RaidDevice State
- 0 0 0 removed
1 8 64 1 active sync missing
Disclaimer
This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.
- Document ID:000021664
- Creation Date: 10-Jan-2025
- Modified Date:23-Jan-2025
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- SUSE Linux Enterprise Server
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