Hello,
If I enable auto-trim for a ZFS pool, when does it run? The documentation doesn’t seem to say at Managing Pools | TrueNAS Documentation Hub .
AFAIK, a TRIM command is sent to the device whenever a block is deleted. So it’s immediate.
Ah! That was the part that wasn’t clear to me from the tooltip in the GUI or the documentation. The warning about the performance impact makes much more sense now, as well as the recommendation to use a cron job to do it once a week instead of constantly.
TRIM operations definitely seem slow on my NVME data storage pool, so I’d not want that happening all the time.