Re:Don’t Be Afraid of RAID
by magicalhippo on Sunday May 24, 2020 @06:06PM
(#23295269)
> but you will be limited to the utilization of the lowest capacity drive on the larger drives in the pool
Small, but important, correction: the drive size limiting is per vdev. A pool consist of one or more vdevs.
So say you have a pool consisting of two mirrored vdevs, one with a pair of 3TB and one with a pair of 4TB drives, and one 3TB drive dies. If your local supplier don't have the same 3TB disk in stock, you can take a 4TB or similar and pair it with the old 3TB.
The pool will then still have a capacity of 3+4 = 7TB, but at least each mirrored pair will be intact.
Small, but important, correction: the drive size limiting is per vdev. A pool consist of one or more vdevs.
So say you have a pool consisting of two mirrored vdevs, one with a pair of 3TB and one with a pair of 4TB drives, and one 3TB drive dies. If your local supplier don't have the same 3TB disk in stock, you can take a 4TB or similar and pair it with the old 3TB.
The pool will then still have a capacity of 3+4 = 7TB, but at least each mirrored pair will be intact.