Can more physical drives be added to mirror vdevs after a zpool has been created?
For example, if a zpool is created using:
zpool create test_pool mirror /dev/sd0 /dev/sd1 mirror /dev/sd2 /dev/sd3
Can more drives be added to the vdevs to increase their redundancy? That is, can the number of mirrored drives be increased from 1 to 2?