Missing Pool - state is OFFLINE

[Arwen]

Agree with @SmallBarky, you need to get 1 of the failed disks back. Or your data is lost.

@Ogrebear

my place does not seem to have had any power cuts

Power problems can cause hardware, like disks, to fail.

However, ZFS was specifically designed NOT to loose data on power loss, (or OS crash):

ZFS pools & power loss - you won't lose data

There is sometimes misconceptions about ZFS losing data due to power loss. The subject of power loss, (or OS crash), and then not being able to import a ZFS pool comes up here in the forums a few times a month. Here is the skinny on what should happen. There are several things to un-pack about power loss affecting ZFS and data loss. Any previously stored data in a ZFS pool can not be / is not lost on power loss. Exception is in hardware failures that affect pool redundancy. Like the loss of b…