Hello,
I’m a long time Truenas user (started with Freenas 7 in 2012), but I’m not a professionnal user, simply an amateur.
What are the risks using some large pools (64 TB : 8*8 TB SAS, RaidZ2) with only 32 GB of RAM ? My system is really simple, I’m a single user, there’s not VMs, it’s just a storage pool, with few reads/writes. I can’t upgrade RAM without changing the motherboard and the processor…
Thank for your advices !
That depends a bit on what you use the storage for.
If you just use it to say, hold and maybe stream your media library, 32GB is plenty.
You mention no VM’s but if you want to run a bunch of containers, you may feel constrained by the RAM, depending on the apps in question. I wouldn’t recommend counting on a good iSCSI experience either.
Do not activate deduplication, it’s incredibly RAM hungry.
I don’t think that keep only 32gb of RAM can harm on stability 
Slower performance, but if you run Gigabit network you don’t have to worry about it unless you have particularly small files or do iSCSI.
Certainly not due to having large pools; on the other hand, running too many VMs, Apps, or services can cause issues.
I remember well that don’t worry 
But seems the Op have a basic single use… So he should be good IMHO
There’s no VMs, no containers, no deduplication (I’ve got issues with it previously), and no iSCSI, and this is a gigabit network, so it’s good. I can upgrade my pool.
Thank you !
Here’s my actual memory usage.
Go without fear. Actually, fear your 4 striped drives.
Thanks ! There’s no sensitive data on this pool 
I can lose it, that’s why it was a stripe with old drives.
