Dec 28, 2020 · While the automatic TRIM process is highly effective it is more likely than a manual TRIM to encounter tiny ranges. Ranges less than or equal to 'zfs_trim_extent_bytes_min' (32k) are considered too small to efficiently TRIM and are skipped. This means small amounts of freed space may not be automatically trimmed.

Jan 2, 2020 · This may occur when the freed blocks are small and not enough time was allowed to aggregate them. An automatic TRIM and a manual zpool trim may be run concurrently, in which case the automatic TRIM will yield to the manual TRIM. so zpool set autotrim=on and a periodic zpool trim is the recommended approach.

Edit: I can confirm that zpool trim <poolname> works perfectly and seems to run TRIM only on the pool (aka partition) that is stated in the command. That means in my case: zpool trim rpool runs TRIM on the 3rd partition of each SSD. zpool status -t rpool after TRIM shows: (100% trimmed, completed at Fri Dec 20 19:09:54 2019) while

Jan 13, 2021 · Further, zpool get all or zfs get all gets all properties on all pools or all properties on all datasets/zvols respectively. autotrim is a pool property that issues trim commands to pool members as things go. So, in that case, zpool set autotrim=on POOLNAME would be how to enable it. Alternatively, to trim a pool on command, zpool trim POOLNAME.

Dec 17, 2019 · sudo zpool status -t poolname. Shows stuff like : (100% trimmed, completed at Tue 17 Dec 2019 04:03:39 PM CST)

May 30, 2024 · Anyway, I've got a PVE 8.2 server with a ZFS pool of 8x SATA SSDs in a raidz2 config. Running "zpool status -t poolname" shows all drives as "untrimmed". I've noticed that if I delete a VM the space isn't reclaimed i.e. "zpool list" is showing "3.7TB" in the "ALLOC" column before and after removing the VM. The server is just a couple months old.

Jul 22, 2022 · Trim inside a guest on a virtual disk isn’t going to directly trim the hosts physical storage. For a thin provisioned virtual disk that supports trim like qcow2 or ZFS zvol, trim inside the guest will allow the virtual disk to free up blocks in the disk file (or ZFS zvol) and that will shrink the file (or zvol).

Jul 5, 2022 · zfs and virtio both have trim support, which means, that trim operations can be forwarded by VMs using zvols to the physical underlaying disks. (Please excuse my usage of the word "physical zpool". I use it to distinguish the zpool on the physical disks from the zpool on the zvols). My question with this setup is now:

Sep 10, 2023 · TRIM all SSD pools. 24 0 1-7 * * /usr/sbin/zpool trim rpool 26 0 1-7 * * /usr/sbin/zpool trim data What Debian does is located in /usr/lib/zfs-linux/trim - try to run it in debug mode and see it bail immediately. Very strange.

Mar 19, 2022 · zpool trim is asynchronous. zpool set autotrim=on enables synchronous TRIM. You only need one or the other; choose accordingly. If you have known downtime periods, it makes more sense to schedule zpool trim to occur daily during the known downtime period using either crontabs or systemd timers, IMO. Not TRIMming for 6-7mos won't have much impact.