Hi there,
we recently had a problem with two OSDs failing because of I/O errors of
the underlying disks. We run a small ceph cluster with 3 nodes and 18
OSDs in total. All 3 nodes are dell poweredge r515 servers with PERC
H700 (MegaRAID SAS 2108) RAID controllers. All disks are configured as
single disk RAID 0 arrays. A disk on two separate nodes started showing
I/O errors reported by SMART, with one of the disks reporting pre
failure SMART error. The node with the failing disk also reported XFS
I/O errors. In both cases the OSD daemons kept running although ceph
reported that they were slow to respond. When we started to look into
this we first tried restarted the OSDs. They then failed straight away.
We ended up with data loss. We are running ceph 0.80.5 on Scientific
Linux 6.6 with a replication level of 2. We had hoped that loosing disks
due to hardware failure would be recoverable.
Is this a known issue with the RAID controllers, version of ceph?
Regards
magnus
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Scotland, with registration number SC005336.
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