Increasing SCALE ARC size

[probain]

I'm once again gonna throw my two cents in the ring, and suggest that this is done via a cron-job instead. Especially if you use VM's.
Having it done via Cron also means that you can more easily run it on demand. If you need to adjust it. This then doesn't need reboots.
It all means that not only do you get all of the benefits from the post-init method, but several more benefits in addition too.

Just make sure that you don't check "Hide Standard Output". If you do, then you have to encapsulate the entire command in parenthesis ( ).

Two cents deposited in my humble jar

 

[NugentS]

View attachment 72420
Applied via CLI

However - this gets reset by (for example) switching off and back on a VM. I shall check tomorrow if thats just a temp issue - or if the reset is permanent. Logic would say its not permanent - but these are computers - so logic may not apply.

"Malign form of alien intelligence that has taken over the world"

 

[probain]

However - this gets reset by (for example) switching off and back on a VM. I shall check tomorrow if thats just a temp issue - or if the reset is permanent. Logic would say its not permanent - but these are computers - so logic may not apply.

"Malign form of alien intelligence that has taken over the world"

It's permanent.
When the VM is destroyed (turned off) it hard sets the zfs_arc_max value. I've got a Jira on it, and they're aware and working on it.

 

[NugentS]

Thus your previous reccomendation to use a cron job.

However - my VM is not started automatically - I manually start it. So how did I ever get the extra ARC - as it was running with the VM running.

 

[probain]

Thus your previous reccomendation to use a cron job.

However - my VM is not started automatically - I manually start it. So how did I ever get the extra ARC - as it was running with the VM running.

It only happens when the VM is turned off. That's why :)

 

[Sawtaytoes]

Here are some pictures to help others out for my 256GB of RAM:

Code:

# This is for 256GB of RAM with only 32GB left over.
echo 235750068224 >> /sys/module/zfs/parameters/zfs_arc_max

View attachment 72425

Forgot to post an update. Yes, it worked!