Bug#668034: mdadm: Typo in 4b. Can a 4-disk RAID10 survive two disk failures?
Michael Tokarev
mjt at tls.msk.ru
Thu Apr 12 18:52:00 UTC 2012
tags 668034 + squeeze
thanks
On 08.04.2012 16:42, Olaf van der Spek wrote:
> Package: mdadm
> Version: 3.1.4-1+8efb9d1+squeeze1
> Severity: wishlist
>
> Hi,
>
> FAQ.gz:
> In two thirds of the cases, yes[0], and it does not matter which layout you
> use. When you assemble 4 disks into a RAID10, you essentially stripe a RAID0
> across two RAID1, so the four disks A,B,C,D become two pairs: A,B and C,D.
> If A fails, the RAID6 can only survive if the second failing disk is either
> C or D; If B fails, your array is dead.
>
> RAID6 should be RAID10 in the second to last line.
This has been fixed for wheezy, see #637068.
/mjt
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