hi,
I sometimes see cases where io failed after some path failover, although there are other valid paths.
I seem to get a lot of the following errors during a path removal (failover):
Aug 1 08:59:37 lg641 multipathd: 3514f0c532d80000a: failed in domap for removal of path sdcy Aug 1 08:59:37 lg641 multipathd: uevent trigger error Aug 1 08:59:37 lg641 multipathd: sdt: remove path (uevent) Aug 1 08:59:37 lg641 kernel: device-mapper: table: 253:5: multipath: error getting device Aug 1 08:59:37 lg641 kernel: device-mapper: ioctl: error adding target to table Aug 1 08:59:37 lg641 multipathd: 3514f0c532d800001: load table [0 21474836480 multipath 0 0 1 1 queue-length 0 12 1 66:240 1 66:80 1 70:192 1 71:96 1 67:176 1 67:112 1 71:224 1 128:128 1 8: 16 1 69:16 1 69:32 1 8:32 1] Aug 1 08:59:37 lg641 multipathd: sdt: path removed from map 3514f0c532d800001f
All the other paths are there, and still multipath decided to fail the io with no apparent reason.
I would appreciate any comment about:
1. How can this happen.
2. How can I increase the log level to understand multipath decisions.
3. Why do I always see the errors regarding adding target to table.
The only thing I can think think about, that multipath temporarily bypassed the other paths (maybe it got busy several times and gave up).
I would appreciate any comment about:
1. How can this happen.
2. How can I increase the log level to understand multipath decisions.
3. Why do I always see the errors regarding adding target to table.
The only thing I can think think about, that multipath temporarily bypassed the other paths (maybe it got busy several times and gave up).
I'm using device-mapper-multipath-0.4.9-64.el6.x86_64.
Thanks a lot,
Amitai
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