And the scrub has to be initiated somehow, typically cron job, it's not automatic in ZFS.

Though NAS distributions like TrueNAS/FreeNAS sets this up for you by default.

> 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.

> A friendly minor correction...

Thank you. I'm no expert in ZFS TBH (We use Lustre much more) but, IIRC, when I was benchmarking the then new Sun Oracle ZFS 7320, I remember it was resilvering the disks after especially torturous loads, at night.

Maybe it was specific to the appliances (Our behemoth 7420 did the same) or, something was wrong. I remember Oracle/Sun guys jokingly asking me whether I succeeded to make it resilver the disks and, hearing it did indeed resilver the disks a dozen times visibly upset them. They've only said that "Pack it up, we need to go".

Fun times, it was.

Hmm, if you had to resilver the disks a dozen times, I would assume that is indication of a hardware failure somewhere in the device (perhaps RAM?).