17 Jul
2020
17 Jul
'20
11:58 a.m.
On Jul 17, 2020, at 2:54 PM, Grant Taylor via cctalk
<cctalk at classiccmp.org> wrote:
..
What is "three drive parity"? "Parity" is the description of RAID-5,
and 3 drive RAID-5 is certainly perfectly standard. RAID-1 is not parity, it's
mirroring. Is the question about triple mirroring, i.e., 3 drives all having the same
data on them? That's pretty rare though not unheard of, I've never seen a RAID-x
designation for that.
For high availability, RAID-6 is much more economical (and at this point the standard
choice); triple mirroring is of that class, with the difference that it performs better
for random short writes.
paul
Interesting. Is there an official RAID level for
three drive parity?
I'm not aware of one. But my ignorance thereof does not preclude it from existing.