on disk failure per year, go ahead you can go up to 28 disk (at a time where disk size was 4G and performance was a must be)
btw , think about it : one 14 disk raidwith double parity is more reliable than two 7 disk raids and also more efficient as data are better balance
i would advise you a 14 disk raid size with 1 or 2 parity disk
i can't give you bench time of reconstuction i can only tell you double parity doesnt impact performance neither reconstruction
Tavis Gustafson wrote:
I usually setup my filers with raidsize=7 having no more than 7 disks per volume. However, I would like create a raidsize=13 volume. The only risk i can glean from NOW is that rebuild time will increase and thus increase the chances of a second drive failure (during rebuild).
Has anyone had any real world issues with using volumes of raidsize > 10
thanks, -Tavis