> And the scrub has to be initiated somehow, typically cron job, it's not automatic in ZFS.
The devices were Oracle/Sun ZFS appliances (I tortured a 7320, we liked it & bought a full-out 7420) so, maybe it was set up to scrub/resilver automatically in some cases.
As I've aforementioned, we're more of a Lustre shop and retired the systems some years ago.
Though NAS distributions like TrueNAS/FreeNAS sets this up for you by default.