Re: RAID-6 support in kernel?

[Luca Berra <bluca@comedia.it>]

On Tue, Jun 04, 2002 at 10:20:53PM +0200, Jakob Østergaard wrote:
> What often happens (in my experience) is, that a number of disks build up bad
> blocks.  One day, you hit one of those bad blocks, and that one disk is kicked
> from the array.
> 
> When you re-sync, you *will* hit the remaining bad blocks on the other disks,
> causing the array to fail completely.
> 
> Using hot-spares will "automate" this failure - meaning that an administrator
> may not be anywhere near the system when this total failure happens.
> 
> Not using hot-spares is less "automatic" in the lucky case where everything
> works, but it also assures that an administrator actually is near the system
> when the total failure is likely to occur.
well, what we could do to prevent this. if you don't have or trust S.M.A.R.T.
is having a 'consistency check' function in md, that would read from all disks
and even compare data or calculate parity for raid5, it could be scheduled
to run periodically with a very very low priority.

L.

-- 
Luca Berra -- bluca@comedia.it
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