Available Memory: 0.10 KiB???

[revengineer]

Peculiar issue: My FreeNAS server has 80 GB of RAM. Typically I show about 48 GB RAM available for Virtual Machines. Sometimes when I stop and restart a VM, the available memory shown at the top of the GUI shows "Available Memory: 0.10 KiB" with no VM running and I get a warning when restarting the VM. Is this a bug? Is there a manual way to refresh the available memory?

 

[Newfoundland.Republic]

Version of FreeNAS?

 

[revengineer]

Version of FreeNAS?

Indeed, that could be relevant. It's 11.3-U4.1.

 

[revengineer]

Also, the memory widget on the FreeNAS homepage GUI shows 1.7 GiB free, 64.1 GiB ZFS Cache, and 11.5 GiB Services.

 

[revengineer]

Bumping this one. Has anyone seen this? If no solution, I may go for a bug report.

 

[sretalla]

Traditionally, if you like to run VMs, you should adjust your vfs.zfs.arc_max... with a loader tunable (linked article covers that) to allow for sufficient free RAM for the VMs you need to start,

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

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)

www.ixsystems.com

 

[revengineer]

Thank you @sretalla. I must have missed this in my initial setup. I assumed that FreeNAS would automatically treat ARC memory as reclaimable if needed. Not sure where that naive thought came from. I now set the tunable to 50G, which should be plenty for my 48 TB Raid Z2 pool.