Re: read-from-all-disks support for RAID1?

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In article <[email protected]> you wrote:
> However, I'm not 100% certain that WV would really be useful.  Modern
> drives will almost certainly return a read-after-write request out of
> the drive's cache rather than going to the media.  We would need some
> way to tell the drive to ignore the cache for this read.  I suspect
> this is possible, but might not be trivial...

I too think an background disk scrubbing job to detect bit errors
(expecially usefull for raid5, but also helpfull todetect bad hardware)
would be good. Some user mode API is needed to address parts of mirrors or
parity sets.

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