Does AutoTune adjust the values when hardware/network changes

[Koen_Oostende]

A year ago I installed my FreeNAS server. After everything was setup, I turned on Autotune. The server is functioning as it should, but over time some things changed. Initially the pool was 8 drives, now it consists of 15 drives. The server is connected to a new (faster) switch. In short. Do I have to remove all AutoTune tuneables and start over, or do I just turn on AutoTune and the values that have to be changed will change?

 

[dlavigne]

The script is automatically reapplied at every boot.

 

[fracai]

Also note that autotune is generally not recommended for most systems. Unless things have changed since I last looked at this, autotune was intended for systems with huge amounts of CPU and RAM and most consumer systems could see detrimental changes instead of improvements.

Has anything changed here?

 

[dlavigne]

Nope, still not recommended and the entry in the Guide says it should be a temporary measure.

 

[Koen_Oostende]

I don't want a discussion against/for AutoTune. I just need a clear answer. If AutoTune is turned on and the system is cold booted... Will it change previously saved tunables or does the system see the tunable in place and never check for better options?

 

[dlavigne]

As mentioned above, the script is rerun at every boot (as indicated in that section of the Guide).

 

[Koen_Oostende]

(as indicated in that section of the Guide)
Note that DELETING tunables that were created by autotune only affects the current session, as autotune-set tunables are recreated at boot.