On 13/11/2008 23:04, Mikael Abrahamsson wrote (in the "OT: Tips for good
hard drives for a home server" thread):
Looking at the md code in linux, would it be possible to do some work
around here in that if a drive read operationstalls, let's try to read
from the other drives and then re-write the block on the drive that
stalled?
I'd like to second this suggestion; my coding skills are WAY too rusty
to attempt it myself, but it sounds like an excellent idea.
We could also have a timeout setting so that if a read stalls, at least
the application can get its data (by reading the other discs) and the md
subsystem can carry on waiting for the read and/or just doing the
rewrite in the background.
What happens at the moment - could one slow read cause the array to be
switched into degraded mode immediately?
Cheers,
John.
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