On Sun, 18 Jul 2021 at 09:29, Pouya Tafti <pouya+lists.net...@nohup.io> wrote: > > On Thu, Jul 15, 2021 at 11:43:55AM +0100, David Brownlee wrote: > > Depending on your upgrade plans you may want to consider one 6x1TB > > RAIDZ2 rather than 2 4x1TB RAIDZ2 - you end up with the same amount of > > usable space and you have two spare bays for when the time comes to > > upgrade. (This suggestion is much relevant if you have other systems > > where you can easily hook up a 4 drive RAIDZ2, but not a 6 drive > > RAIDZ2 :-p) > > > > I have a somewhat similar setup on a Dell T320 - SAS9217-8i with 8 > > drives (plus one on onboard ahcisata), 6 in a RAIDZ2, two in a zfs > > mirror and one for boot > > Thanks! This is an interesting suggestion. I'm wondering though, wouldn't > having a two-drive mirror create an assymmetry in how many failed drives you > could tolerate? If you lost both mirrors the whole pool would be gone (I > assume disks of the same origin may have correlated failures). > > But as you say, the 6x RAIDZ2 is worth considering and it may be smarter not > to use all the disks. ;)
Well the 6x RAIDZ2 gives the same usable space, leaving the simple mirror for some additional scratch space for less critical data :) David
