Trim operations not supported

[tcpluess]

System information

openzfs: zfs-2.4.0-pve1, zfs-kmod-2.4.0-pve1
system: Linux 6.17.9-1-pve #1 SMP PREEMPT_DYNAMIC PMX 6.17.9-1 (2026-01-12T16:25Z) x86_64 GNU/Linux

Description of the issue

Previously, I was using openzfs 2.3. There, when issuing a command

zpool trim tank

the command completes without any errors or warnings, and all the SSDs in the pool tank are trimmed, and the HDDs are ignored.

Now, I updated to openzfs 2.4.0. When I run

zpool trim tank

he tries to trim also the HDDs, which obviously fails, and reports:

cannot trim '/dev/disk/by-id/wwn-0x5000c500dc78fdb1-part1': trim operations are not supported by this device

Trimming still works, and the pool seems to be intact and fine, it is just that now this error appears, whereas previously, devices that do not support TRIM were silently ignored. I wonder, is this changed behaviour a bug or a feature, and why was it changed?

[amotin]

Indeed. I can reproduce it now, and don't remember it before. For hybrid pools it is not right.

[tcpluess]

Cool that you can reproduce it! I wonder, what was the reason this was changed?