Removing L2ARC from Pool

[Gustav]

Hi,

No matter how hard I search, I simply can't find the function or setting to remove L2ARC cache from the data pool. Am I completely blind, or is it simply not possible to do it in the graphical user interface (GUI)?

Thank you in advance for your help.

 

[NickF]

Storage -> Pool -> Manage devices

 

[Gustav]

its just not there....

 

[Gustav]

Storage -> Pool -> Manage devices
View attachment 67871

this option is not visible ....

 

[mrpasc]

If I remember correctly, it seems that ZFS cannot remove special vdevs from any kind of RAIDZ pools as of OpenZFS v2.1.4.
You seem to have a RAIDZ1 pool, NickF‘s pool consist of mirrored vdevs. That’s why he can remove vDev and you can’t.

 

[Gustav]

If I remember correctly, it seems that ZFS cannot remove special vdevs from any kind of RAIDZ pools as of OpenZFS v2.1.4.
You seem to have a RAIDZ1 pool, NickF‘s pool consist of mirrored vdevs. That’s why he can remove vDev and you can’t.

i can remove it. but just via shell.
with
$ sudo zpool remove pool l2arc-device
worked.
so the question is, why i cannot do it in gui. make a little bit no sense.

 

[jgreco]

If I remember correctly, it seems that ZFS cannot remove special vdevs from any kind of RAIDZ pools as of OpenZFS v2.1.4.

Pools are not characterized as RAIDZ, vdevs are. You might only have a single data vdev in your pool though.

Normal L2ARC can be removed from any pool type and should be removable. It could be a GUI issue of some sort.

 

[Gustav]

i think the same: its a bug !
how to report to the TrueNAS guys?

 

[jgreco]

Top of the page, "Report a Bug"

 

[dirtyfreebooter]

23.12.3.1 is definitely missing the GUI button to remove L2ARC or SLOG devices from a pool. i was just experimenting with SLOG and had to use the CLI to remove.

 

[Gustav]

Top of the page, "Report a Bug"

can somebody report it please?
i dont have this account for reporting. Thank you.

 

[Redcoat]

Done for you - ticket NAS-122781.

Respectfully, I suggest that you register for a Jira account so you can follow its progress and make your own reports in future.

 

[Gustav]

Done for you - ticket NAS-122781.

Respectfully, I suggest that you register for a Jira account so you can follow its progress and make your own reports in future.

Thank you.

i will.

 

[HoneyBadger]

23.12.3.1 is definitely missing the GUI button to remove L2ARC or SLOG devices from a pool. i was just experimenting with SLOG and had to use the CLI to remove.

Just created a test pool on 22.12.3.1 and I have removal options for both the L2ARC and SLOG (single or mirror) devices.

Can you force-refresh and/or clear your browser cache and check again?

 

[Gustav]

Just created a test pool on 22.12.3.1 and I have removal options for both the L2ARC and SLOG (single or mirror) devices.

View attachment 67945

Can you force-refresh and/or clear your browser cache and check

you have to read little bit above.
This Problem ist just present, when you have some RAIDZ pool.

 

[HoneyBadger]

you have to read little bit above.
This Problem ist just present, when you have some RAIDZ pool.

My apologies; let me retest with a RAIDZ configuration.

 

[HoneyBadger]

Apologies again - you are correct, with a top-level RAIDZ vdev it is not offering options for removal of cache and log vdevs.

If I remember correctly, it seems that ZFS cannot remove special vdevs from any kind of RAIDZ pools as of OpenZFS v2.1.4.
You seem to have a RAIDZ1 pool, NickF‘s pool consist of mirrored vdevs. That’s why he can remove vDev and you can’t.

This is correct, but cache and log are not treated as special vdev units, they are different. I would expect the REMOVE to be missing from those vdev types here. Seems like a UI bug may have been introduced in 22.12.3 or .1 as I don't see it on an older 22.12.2 install.

 

[Redcoat]

you have to read little bit above.
This Problem ist just present, when you have some RAIDZ pool.

@Gustav , have you seen the Jira request to provide a debug file? If not, please sign on to the ticket and follow the instructions for the request.

 

[imxtristan]

I am a noob with the same issue- I needed to remove an nvme ssd from being a cache drive for my data pool. I searched the GUI unsuccessfully- still unable to find a solution. I read a community post: https://www.truenas.com/community/threads/unable-to-remove-slog-from-pool.111032/ from a user named Patrick M. Hausen who outlined how to use the command line interface to remove an SLOG device from a pool-- which I successfully applied to my cache device situation.

I used the console to get to the linux shell to execute the commands Patrick outlined.

 

[HoneyBadger]

This should be addressed in 22.12.4 - thanks for the report.

The command line will work to remove cache and log vdevs until the fix is in the UI - but note that it still can't perform tasks that ZFS won't allow (eg: removing a RAIDZ data vdev)