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http://www.open-zfs.org/wiki/Features
This feature enhances OpenZFS's internal space accounting information. This new accounting information is used to provide a -n (dry-run) option for zfs send which can instantly calculate the amount of send stream data a specific zfs send command would generate.
https://www.phoronix.com/scan.php?page=news_item&px=ZFS-On-Linux-TRIM-Closer
Apr 13, 2018 · TRIM/UNMAP support has already been available in FreeBSD's ZFS code for several years but not yet in the other OpenZFS projects like ZFS On Linux. TRIM, of course, can improve the solid-state drive performance as in effect a more efficient garbage collection of informing the SSD about no longer needed blocks.
https://www.freebsd.org/doc/en/books/faq/all-about-zfs.html
ZFS TRIM support was added to all FreeBSD-STABLE branches in r 252162 and r 251419, respectively. ZFS TRIM is enabled by default, and can be turned off by adding this line to /etc/sysctl.conf : vfs.zfs.trim.enabled=0
https://hardforum.com/threads/zfs-on-linux-now-supports-trim.1979755/
Mar 31, 2019 · Add TRIM support UNMAP/TRIM support is a frequently-requested feature to help prevent performance from degrading on SSDs and on various other SAN-like storage back-ends. By issuing UNMAP/TRIM commands for sectors which are no longer allocated the underlying device can often more efficiently manage itself.
https://forum.proxmox.com/threads/zfs-trim-and-over-provisioning-support.32854/
Jul 17, 2018 · No, ZFS on Linux (ZOL) does not support TRIM.
https://github.com/zfsonlinux/zfs/pull/3656
The zfs_trim parameter controls the lower-level vdev trimming whereas the pool property controls it at a higher level. By default, trims are batched and only applied every 32 transaction groups as controlled by the new zfs_txgs_per_trim parameter. ... TRIM/Discard support from Nexenta TRIM/Discard support from Nexenta Sep 14, 2015. dweeezil ...
https://community.oracle.com/thread/2145623
Mar 11, 2013 · The equivalent of TRIM is supported as SCSI unmap in Solaris 11.1 and ZFS will recognize that blocks are reclaimed. We have some challenges due to 15804599, which means SSD performance is severely impacted by SCSI unmap.
https://www.reddit.com/r/zfs/comments/3vvbhh/trim_and_zfs/
TRIM and ZFS. So I've been trawling the internet for a couple of days looking for information on which versions support TRIM so far I've only found Solaris 11 and FreeBSD 9.2+. The illumos folks seem to be working on it but I can't find and roadmaps as to when it would be released.
https://forum.proxmox.com/threads/zfs-with-ssds-am-i-asking-for-a-headache-in-the-near-future.25967/
Feb 21, 2017 · I have no idea how the lack of TRIM in ZFS affects cache performance in the long term, but all SSDs have automatic garbage collection / maintenance routines, so I think the most important thing is to set aside some decent OP (over provision = unpartitioned space) area, like 15-20% of the capacity, and I reckon everything should be fine.
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