[zaarn]

DMSMR is an issue yes, but CMR disks already do it and it's not as much of an issue as you think. On a CMR this is entirely fine.

The issue with SMR is that because a write can have insane latencies, normal access gets problems.

CMR doesn't have those write latencies, so you won't face resilvering taking forever.

It also helps if you run a newer ZFS, which has sequential resilvers that do in fact run fine on an SMR disk.

I will also point out that wear leveling on a DMR disk tries to achieve maximum linear write/read performance by organizing commonly read sectors closer to eachother.