On Mon, Jun 12, 2017 at 01:44:56AM -0500, John D. Baker wrote: > On Mon, 12 Jun 2017 04:55:52 -0000 (UTC), [email protected] (Michael > van Elst) wrote: > > > Currently best practice for such a RAID is: > > > > -> align the RAID partition(s) on each component to 4k > > A given. That's all these components are going to do, so 0 % 8 == 0. > > > -> use a stripe size of 64k (maxphys), with RAID-5 on 3 disks that's > > SecPerSU=64 (parity doesn't count). > > Doesn't RAIDframe assume 512-byte sectors? So, 64k stripe size would > be SecPerSU=128, yes?
I think it's SecPerSU=64 blocks = 32k. Two data disks in one write, so 2 * 32k = 64k = MAXPHYS written in one write. (Please correct me if I'm wrong: I just make a 3 * 2T raid 5 this morning ;-) ) Cheers, Patrick
