Messages in this thread | | | From | Kalin KOZHUHAROV <> | Subject | Re: read-from-all-disks support for RAID1? | Date | Sun, 11 Sep 2005 17:55:26 +0900 |
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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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