I ZFS scrub once a month which takes ~24 hours for the 72TB. For what I can find about how often I should scrub is:
- very busy pools, once per week
- not so busy pools, once per month
or run a scrub, measure the time, and adjust accordingly.
But what about online defragmention?
Is online defragmention considered good practice like scrubbing is? And if, how often should I degrag?