A 5400rpm green is good only for backups, not actual work
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It's unfortunate your largest drive is also the slowest. Here's what I'd do.
System - 128 GB SSD
Projects - 320 GB
Scratch - 320 GB
Media - 1 TB
Exports - 320 GB
Backup and Archive - 2 TB
This was also a bit of my idea for a non raid solution. But my question is why not go for an raid solution? Would it not give me an speed advantage?
In other words, why did you choose for single drives instead of raid 0/3/5??
Jim is not a big favorite of striped arrays, because of the inherent risk of complete data loss. As he set it up with projects and scratch on separate disks, there is no benefit for combining those disks into a raid0. Sure, the speed of the raid volume is almost double that of individual disks, but with two major parts of your disk use, projects and scratch fighting over the same bandwidth, there is no tangible benefit, only increased risk of data loss. At least I think that is what Jim intended to say.
In practice there may be a slight advantage of raiding those two 320 disks, but the benefit will be small and the risks double.
What Harm said.