Mark Lord пишет:
I only see two failures (eg. one retry) in the log you showed.
Yes, I mean 2 tries, so 1 unnecessary rerty.
But it probably was not a retry, but rather a second I/O after
the first one. The filesystem layer often does that.
If kernel tries to read the same sector more then one time, I call that
retry :)
I found that it depend on vm someway... First 'dd if=/dev/sdb
of=/dev/null skip=300000 count=1' causes 2 failures (1 retry), but next
'dd's only 1failure. After I drop vm cache 'sysctl vm.drop_caches=1', I
get two failures again.
running 'dd if=/dev/sdb of=/dev/null skip=300000 count=1 iflag=direct'
always causes only 1 failure
IMHO, looks like cavity somewhere... Any ideas?
Cheers
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