When 3 of 4 disks in a ZFS pool die at the same time, it is not the disks.

It’s the controller that is feeding them.

(Note for later: move a disk to a different controller. This could have been survived completely if half of each mirror were on different controllers.)

What do you call a household with a backup SAS/SATA controller stashed in the box marked “more disk stuff”?

Mine.

-30-