Re: FYI: RAID5 unusably unstable through 2.6.14

[Michael Loftis]

--On January 17, 2006 1:35:46 PM -0600 Cynbe ru Taren <cynbe@xxxxxxx> wrote:

> Just in case the RAID5 maintainers aren't aware of it:
>
> The current Linux kernel RAID5 implementation is just
> too fragile to be used for most of the applications
> where it would be most useful.
>
> In principle, RAID5 should allow construction of a
> disk-based store which is considerably MORE reliable
> than any individual drive.

Absolutely not.  The more spindles the more chances of a double failure. 
Simple statistics will mean that unless you have mirrors the more drives 
you add the more chance of two of them (really) failing at once and choking 
the whole system.

That said, there very well could be (are?) cases where md needs to do a 
better job of handling the world unravelling.
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