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Been finding some good deals on 2.5 disks lately, but have never bought one before. Have a couple of 3.5 disks on the other hand in my Unraid server. Wondering how much it matters wether I get a 2.5 or not? What form factor do you prefer/usually go for?
I think 3.5" are usually priced better per tb than 2.5" drives and performance is usually better too. So unless you feel like burning money for an inferior solution, are have some space constraints that doesn't allow 3.5" drives, I wouldn't go with 2.5" drives. They're more energy efficient though, but you'd need a fuckton of drives for that to make a worthwhile difference in your power bill.
The key here is “better performance at similar price points”. There are absolutely amazing 2.5 drives made for server applications, but they cost so much money you’re better off getting SSD these days.
Speaking of which, you should consider SSD.
Absolutely no shot I can afford 40 TB of SSDs for my NAS
Depending upon your storage setup, may be able to make use of an SSD cache drive for a larger rotational drive array, though.
Ssd for boot but not cost effective for nas. Nor do I trust their longevity.
SSD longevity seems to be better than HDDs overall. The limiting factor is how many write cycles the SSD can handle, but in most cases the write endurance is so high that it's unreachable by most home/NAS systems.
SSDs are however really bad for cold storage, as they will lose the charge stored in their cells if left unpowered too long. When the SSD is powered it will automatically refresh the cells in the background to ensure they don't lose their charge.