On Fri, 29 Apr 2016, Karel Gardas <[email protected]> wrote: > On Fri, Apr 29, 2016 at 10:20 AM, Erling Westenvik > <[email protected]> wrote: >> On Fri, Apr 29, 2016 at 09:49:14AM +0200, Karel Gardas wrote: >>> Also for creation of RAID5 you need minimally 4 drives. >> >> Make that 3. :) > > I stand corrected! Mistake caused by my testing where I prepared 4 > drives also to perform RAID-6 testing besides RAID-5. > > Thanks! Karel
Silly, tangentially related question, perhaps someone knows an answer: Is there a considerable performance impact to be expected when using an odd number of disks in RAID[56] setups? I mean, e.g. with RAID5, one disk stores parity data, so in a 3-disk setup, a 512-byte data block is split between two devices. In a 5-disk setup, or in a 6-disk RAID6 setup, similarly the data chunk is split between four physical devices, so 512/4=nice number. What about situations where 512/3, 512/5, etc? Am I making sense or garbage? K.
