SOLVED Why I cannot modify "vfs.zfs.arc_max" in WebUI?

[fisherwei]

I am trying to change value and comment of "vfs.zfs.arc_max",
but after I click OK button, both of them will reset to original value(comment is "Generated by autotune").

FreeNAS-9.10.1 (d989edd)

 

[dlavigne]

Anything in /var/log/messages when you try to set it? Does it let you manually set the sysctl from Shell? If not, post the exact message you get when you try.

 

[fisherwei]

Anything in /var/log/messages when you try to set it? Does it let you manually set the sysctl from Shell? If not, post the exact message you get when you try.

GUI: not anything output to /var/log/messages
Shell: also nothing in /var/log/messages, but

Code:

[root@nas] ~# sysctl vfs.zfs.arc_max=216438228173
sysctl: oid 'vfs.zfs.arc_max' is a read only tunable
sysctl: Tunable values are set in /boot/loader.conf

 

[dlavigne]

That is telling you to create a loader instead of a sysctl. Does it work in the GUI if you do that?

 

[fisherwei]

That is telling you to create a loader instead of a sysctl. Does it work in the GUI if you do that?

Do you mean "Type" in GUI should be "loader"? It is "loader" already.

 

[m0nkey_]

"Generated by autotune"

Did you disable autotune?

 

[fisherwei]

Did you disable autotune?

No

 

[m0nkey_]

No

There's your problem. Disable it and you should be able to modify it. Any reason as to why you have autotune enabled?

 

[fisherwei]

Did you disable autotune?

>....<

disabled autotune, resolved......

 

[fisherwei]

There's your problem. Disable it and you should be able to modify it. Any reason as to why you have autotune enabled?

https://doc.freenas.org/9.10/freenas_system.html#autotune

doc told me, autotune will only work for non-exist tunable. so, my understand is if I modified some tunable, autotune will ignore re-create... But it seems not.

 

[m0nkey_]

Again, what was your reason for enabling autotune in the first place? Typically, it's a feature reserved for mammoth FreeNAS systems.

 

[fisherwei]

Again, what was your reason for enabling autotune in the first place? Typically, it's a feature reserved for mammoth FreeNAS systems.

This week, I upgraded more 128G memory and 2 SSDs(as l2arc) to my build, I think autotune can help me to adjust tunables for new hardware.