April 28, 201610 yr TiHKAL here says he has only uses 12.5GB of RAM for VM (on a 16GB rig) so 3.5GB for unRAID. He got OOM crash. Link I had frequent but irregular OOM crash booting up VM when leaving 1.5GB to unRAID (8GB RAM total). Things get better when I left 2GB but VM still crashes every now and then. So wondering how much RAM should I reserve for unRAID? Is there a rule of thumb or something? I'm thinking to leave 8GB for unRAID on my main rig once I fully test unRAID out but that sounds a bit excessive.
April 28, 201610 yr In my experience 2GB is fine for basic NAS, no Dockers and no VMs. Enabling VMs probably has a certain amount of fixed overhead in addition to the memory allocated to each VM. Dockers are trickier since they're using the same pool as unRAID, and some of them are pretty hefty. Personally I'd allocate 4GB for unRAID, assuming you're also running a couple of lightweight Dockers.
April 28, 201610 yr I would highly suggest more than 2GB of RAM if you are using plugins and especially cache directories. I would use no less than 4GB. If you want more than 4GB for VM, suggest upgrading RAM. It's pretty cheap nowadays.
April 28, 201610 yr I have 8gb in my system and several dockers and a single plex media player vm. My system hovers around 40% memory usage while all are active.
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