[CentOS] Software RAID10 - which two disks can fail?

[John R Pierce]

On 4/7/2014 12:47 PM, Rafał Radecki wrote:
> As far as I know raid10 is ~ "a raid0 built on top of two raid1" (
> http://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_1.2B0  - raid10). So I
> think that by default in my case:
>
> /dev/sda6 and /dev/sdb6 form the first "raid1"
> /dev/sdd6 and /dev/sdc6 form the second "raid1"
>
> So is it so that if I fail/remove for example:
> - /dev/sdb6 and /dev/sdc6 (different "raid1's") - the raid10 will be
> usable/data will be ok?
> - /dev/sda6 and /dev/sdb6 (the same "raid1") - the raid10 will be not
> usable/data will be lost?

I'm not sure you can verify that.... I would play it safe, and only drop 
one drive at a time.



-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast