Re: Checksumming RAID?

[Roy Sigurd Karlsbakk <roy@karlsbakk.net>]

> One way to handle this at md block level would be to have an option
> for
> raid arrays to always do a full stripe read and consistency check
> whenever a block is read. If the consistency check fails (without any
> errors being indicated from the drives), the array should simply
> return
> a read error - it should /not/ attempt to recover the data (since it
> can't tell which parts are the real problem). If arrays with this
> option are used as first-level arrays, with a "normal" md raid array
> (raid1, raid5, etc.) on top, then the normal raid recovery process
> will
> replace the bad data and initiate a new write to correct the
> undetected
> read error. I think this would perhaps give you the level of
> reliability you are looking for, and be suitable for big arrays
> (indeed,
> it would be unsuitable for small arrays as you need at least two
> levels).

If this system is running RAID-6, recovery should be possible to check both parity chunks, right?

Vennlige hilsener / Best regards

roy
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Roy Sigurd Karlsbakk
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