FreeNas Using 99GB of Ram as wired

[Camofelix]

Hey Everyone! 

 

Question for those of you infinitely wiser than I: 

 

I have a FreeNas serving that I use mostly as medium and longterm storage.

When I built it around 6 months ago I had around ~144GB of ECC ram sticks lying around, so thought, what the heck, let's put all of them in. 

 

I loged in a few minutes ago to see if anything was happening that I should know about and I'm seeing that the OS has allocated 99GB of ram as wired. 

 

Any idea why it may be doing that? 

 

Attached are 2 screens shots, one of system specs (I'm running 2 cpu's, freeness only uses 1)

the other of the recent system memory usage 

 

 

Thanks, 

 

Felix 

[jared404]

"ZFS will use as much as memory it has disponible, for cache and to retain the metadata tables. ZFS runs in kernel space, so the memory counts as wired and it wont release it.
Be default it is capped by about 80% of RAM.

If you wish to reduce it (not recommended), google about vfs.zfs.arc_max and vm.kmem_size loader/tunables." - William Grzybowski

 

https://forums.freenas.org/index.php?threads/wired-memory.9571/

[flibberdipper]

18 minutes ago, crashahotrod said:

"ZFS will use as much as memory it has disponible, for cache and to retain the metadata tables. ZFS runs in kernel space, so the memory counts as wired and it wont release it.
Be default it is capped by about 80% of RAM.

If you wish to reduce it (not recommended), google about vfs.zfs.arc_max and vm.kmem_size loader/tunables." - William Grzybowski

 

https://forums.freenas.org/index.php?threads/wired-memory.9571/

Ditto on what this guy said.

[unijab]

maybe helpful info here also...