Ram allocation for Napp It setup

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epicurean

Active Member
Sep 29, 2014
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I would like some recommendation on ram allocation setup for a Napp It VM under ESXI 6

The VM will run
2 x Intel 3700 800GB SSD in raid 1
6 x 4 TB Seagate spinners in Z2
8 x 450GB SAS Hitachi spinners in Z2

I have 128GB in total to give.

much thanks
 

ttabbal

Active Member
Mar 10, 2016
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As much as you can, obviously. :D

I wouldn't go lower than 8GB, but if I had 128 total, I'd probably start at 32GB and watch the ARC hit rate to see if it might benefit from more. As it's in a VM, I'm assuming you intend to run other things on the machine, so it's always a balancing act.
 

whitey

Moderator
Jun 30, 2014
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12-16GB should be a good start is my vote. I run w/ 2vcpu, 8 gb memory on my 128GB ESXi nodes w/ FreeNAS AIO's and they run like a top. Used to run OmniOS in similar configs and they always did ok as well.
 

epicurean

Active Member
Sep 29, 2014
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Thanks for the replies so far.

Pardon my noobieness, but what is ARC hit rate , and how to check that?

Any issues with changing the ram allocation in the VM , after you set the disk pools and file systems?

thank you
 

ttabbal

Active Member
Mar 10, 2016
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ARC is the disk cache, the hit rate is how often you get data from cache vs the disks. I believe napp-it has a page in the web UI you can view it.

There should be no problem increasing the RAM configuration after the fact. You may need to restart the VM for the kernel to detect the change, or for the VM platform to commit the change. I'm not 100% on that.
 
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