RAID6? (was Re: Anyone Actually Using Virtual Linux Servers?)

[Derek Atkins]

Jarod Wilson <jarod-ajLrJawYSntWk0Htik3J/w at public.gmane.org> writes:

> My personal use cases are my web and mail server and my myth backend.
> RAID6 for me in both (well, the video store on my myth backend is
> actually raid5 w/a hot spare, since my 3ware card is a slightly older
> one that doesn't do raid6).

I've heard of RAID0, RAID1, RAID10, and RAID5..  But what is RAID6 and
how does it compare to the other RAIDs?  According to wikipedia it's
like RAID5 but with dual-parity.  ISTR a problem in that with RAID5 if
you had a partial disk failure (i.e. it just returned bogus data) that
you could corrupt your data because Linux S/W RAID didn't do checksum
verification on reads -- so it was "safer" to use RAID10.  Is this
"fixed" in raid6?

-derek
-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord-DPNOqEs/LNQ at public.gmane.org                        PGP key available

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