On Mon, 29 Jul 2019 17:27:15 -0300 "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxxxxx> wrote: > Hi Roman, I don't think this is usual setup. I understand that there are > RAID10 (also known as RAID 0+1) in which we can have like 4 devices, and > they pair in 2 sets of two disks using stripping, then these sets are > paired using mirroring. This is handled by raid10 driver however, so it > won't suffer for this issue. > > I don't think it's common or even makes sense to back a raid1 with 2 > pure raid0 devices. It might be not a usual setup, but it is a nice possibility that you get with MD. If for the moment you don't have drives of the needed size, but have smaller drives. E.g.: - had a 2x1TB RAID1; - one disk fails; - no 1TB disks at hand; - but lots of 500GB disks; - let's make a 2x500GB RAID0 and have that stand in for the missing 1TB member for the time being; Or here's for a detailed rationale of a more permanent scenario: https://louwrentius.com/building-a-raid-6-array-of-mixed-drives.html -- With respect, Roman -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
