Hello everyone,
an update: I was able to reproduce the problem on my testing
machine (at least sort of) and confirmed that
c8dc9c6 md: raid1,10: Handle REQ_WRITE_SAME flag in write bios
fixes things.
Also applied c8dc9c6 to the main system's 3.8.6 kernel. Working without
any issues.
One interesting detail: on the testing system's 9240-8i lsi controller
(megaraid_sas instead of mpt2sas driver) the log messages where
different and seemingly not coming from controller errors:
Apr 9 12:59:17 kernel: bio too big device sdb (4096 > 256)
Apr 9 12:59:17 kernel: md12: WRITE SAME failed. Manually zeroing.
Whereas the lsi 9211-8i gave these messages:
[ 2772.726292] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2772.726296] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2772.940873] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2773.205568] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2773.953718] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2774.203121] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2774.452462] mpt2sas0: log_info(0x31120320): originator(PL), code(0x12),
sub_code(0x0320)
[ 2774.452476] sd 0:0:4:0: [sde] Unhandled error code
[ 2774.452479] sd 0:0:4:0: [sde]
[ 2774.452480] Result: hostbyte=DID_SOFT_ERROR driverbyte=DRIVER_OK
[ 2774.452482] sd 0:0:4:0: [sde] CDB:
[ 2774.452483] Write(10): 2a 00 a9 84 24 08 00 00 08 00
[ 2774.452491] end_request: I/O error, dev sde, sector 2844009480
[ 2774.452636] md3: WRITE SAME failed. Manually zeroing.
The former one looks a lot more friendly to me.
@lsi guys: this reveals a bug in the mpt2sas driver and/or
the 9211&co series firmware, correct?
Thanks everyone for your help so far,
Matthias
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