Lennert Buytenhek wrote:
(please CC on replies)
Hi!
I recently had a case where one disk in a two-disk RAID1 array went
subtly bad, effectively refusing to write to certain sectors without
reporting an error. Basically, parts of the disk went undetectably
read-only, causing file system corruption that wouldn't go away after
fsck, and all kinds of other fun.
Would it be hard/wise to add an option for RAID1 mode to read from all
devices on a read, and report an error to syslog or simply return an
I/O error if there is a mismatch? (Or use majority voting and tell
people to use 3-disk RAID1 arrays from now on ;-)
Well, an option might be good for debugging, but it will lower performance
a lot, IMHO.
As log as 3-drive RAID1 is concerned :-) You'd better get RAID3 or 2
more drives and RAID5.
Kalin.
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