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Cake day: June 28th, 2023

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  • When you read files from the ZFS filesystem it will automatically keep the files in RAM. This is called the ARC and it is why people frequently recommend having a lot of RAM with ZFS. The ARC is very effective, automatic, and has no risk because it only caches reads. A cache drive is a secondary ARC generally using a fast SSD. The problem is that it generally only helps performance when you are reading lots of small files multiple times. This is because ZFS does so well reading large files from HDD that it doesn’t make much of a difference.

    In short: If you already have the drive and want to play with the feature, go for it. But if your going to spend money on the drive, you will probably be better served spending it on more RAM.





  • Other people have already talked about why you are having performance issues with the Pi. As for a better NAS solution you will probably be better off with a used desktop PC from the last 10 years. If the computer doesn’t have enough SATA ports you can get a sata addon card or HBA (host buss adapter) addon card flashed in IT mode. You should be able to find a lot of options on eBay. Maybe people can chime in with specific models to look at.





  • Truenas has the primary focus of being a NAS. Running apps or VMs is more of a side thing. It can do these things fine, but because it’s not the primary focus it doesn’t get the same level of polish as the NAS aspects.

    My personal solution is to run Proxmox as the host OS with a Truenas VM. Any other services I want to run get to live in VMs or LXC containers. For example all my docker services run across 3 VMs with a docker swarm setup.