[Ocfs2-users] OCFS2 fencing

[ramya tn]

Hi All,

One of our system fenced by itself few days back and this has been happening
very frequently from many days.
But unfortunately, we aree not able to stop the system fencing as we are not
sure what is causing this.

The error i found out in log file is:
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..
.
.
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Feb 20 23:36:41 ImageInt1 kernel: SCSI error : <1 0 2 1> return code =
0x20000
Feb 20 23:36:41 ImageInt1 kernel: end_request: I/O error, dev sdc, sector
656216192
Feb 20 23:36:41 ImageInt1 kernel: SCSI error : <1 0 2 1> return code =
0x20000
Feb 20 23:36:42 ImageInt1 kernel: end_request: I/O error, dev sdc, sector
657248384
Feb 20 23:36:42 ImageInt1 kernel: SCSI error : <1 0 2 1> return code =
0x20000
Feb 20 23:36:42 ImageInt1 kernel: end_request: I/O error, dev sdc, sector
667312256
Feb 20 23:36:42 ImageInt1 kernel: SCSI error : <1 0 2 1> return code =
0x20000
Feb 20 23:36:42 ImageInt1 kernel: end_request: I/O error, dev sdc, sector
670408832
Feb 20 23:36:42 ImageInt1 kernel: SCSI error : <1 0 2 1> return code =
0x20000
Feb 20 23:36:42 ImageInt1 kernel: end_request: I/O error, dev sdc, sector
670666880
.
.
.
.
.
Feb 20 23:53:21 ImageInt1 kernel: Index 13: took 0 ms to do submit_bio for
write
Feb 20 23:53:21 ImageInt1 kernel: Index 14: took 0 ms to do checking slots
Feb 20 23:53:21 ImageInt1 kernel: Index 15: took 50 ms to do waiting for
write completion
Feb 20 23:53:21 ImageInt1 kernel: Index 16: took 1904 ms to do msleep
Feb 20 23:53:21 ImageInt1 kernel: Index 17: took 0 ms to do allocating bios
for read
Feb 20 23:53:21 ImageInt1 kernel: Index 18: took 0 ms to do bio alloc read
Feb 20 23:53:21 ImageInt1 kernel: Index 19: took 0 ms to do bio add page
read
Feb 20 23:53:21 ImageInt1 kernel: Index 20: took 0 ms to do submit_bio for
read
Feb 20 23:53:21 ImageInt1 kernel: Index 21: took 44652 ms to do waiting for
read completion
Feb 20 23:53:21 ImageInt1 kernel: Index 22: took 0 ms to do bio alloc write
Feb 20 23:53:21 ImageInt1 kernel: Index 23: took 0 ms to do bio add page
write
Feb 20 23:53:21 ImageInt1 kernel: Index 0: took 0 ms to do submit_bio for
write
Feb 20 23:53:21 ImageInt1 kernel: Index 1: took 0 ms to do checking slots
Feb 20 23:53:21 ImageInt1 kernel: Index 2: took 9307 ms to do waiting for
write completion
Feb 20 23:53:21 ImageInt1 kernel: Index 3: took 0 ms to do allocating bios
for read
Feb 20 23:53:21 ImageInt1 kernel: Index 4: took 0 ms to do bio alloc read
Feb 20 23:53:21 ImageInt1 kernel: Index 5: took 0 ms to do bio add page read
Feb 20 23:53:21 ImageInt1 kernel: Index 6: took 0 ms to do submit_bio for
read
Feb 20 23:53:22 ImageInt1 kernel: Index 7: took 35756 ms to do waiting for
read completion
Feb 20 23:53:22 ImageInt1 kernel: Index 8: took 0 ms to do bio alloc write
Feb 20 23:53:22 ImageInt1 kernel: Index 9: took 0 ms to do bio add page
write
Feb 20 23:53:22 ImageInt1 kernel: Index 10: took 0 ms to do submit_bio for
write
Feb 20 23:53:22 ImageInt1 kernel: Index 11: took 0 ms to do checking slots
Feb 20 23:53:22 ImageInt1 kernel: Index 12: took 84549 ms to do waiting for
write completion
Feb 20 23:53:22 ImageInt1 kernel: *** ocfs2 is very sorry to be fencing this
system by restarting ***
I found the same scsi errors each time it fences. Can anyone suggest what
could be the reason for these SCSI errors and is it those SCSI errors which
is causing fencing.

Any help in regards to this will be much appreciated.

Thanks,
Ramya
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