r/zfs
Building a new TrueNAS pool? Why I still buy Enterprise at the same price
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Putting together a TrueNAS pool or adding drives to one? This is what I actually do now, because the usual reasoning is a bit off here. CMR vs SMR: CMR vs SMR still matters most, and I'd check the exact model before buying anything. SMR can look totally fine until you have to resilver, and then it gets painfully slow, sometimes enough that the drive drops out during the rebuild. The WD Red mess back in 2020 is the obvious example, and SMR still sneaks into some consumer NAS models, so it's worth the two minutes to check the model number. Enterprise instead of Consumer: It mostly comes down to price, and here's where the usual advice is outdated. People still say "just buy Exos, it's barely more per TB." The "barely more" part isn't even true anymore. I've been tracking prices, and the gap between consumer (Red Plus, IronWolf) and enterprise (Exos, MG, Ultrastar) has basically closed on a price/TB basis. The premium people used to complain about is gone. How to compare them: Once you look at Backblaze's numbers model by model, the current CMR drives all fail at about the same rate. So I wouldn't pay extra for an enterprise drive expecting it to last longer. The data doesn't back that up. My approach: Exos costs about the same as a Red Plus, and I'd still just buy the Exos. Not because it's more reliable, but because for the same money you also get the 5-year warranty...
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Exos costs about the same as a Red Plus, and I'd still just buy the Exos. Not because it's more reliable, but because for the same money you also get the 5-year warranty and the higher workload rating.
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Long story short - confirm a drive is CMR, then buy on price/TB. And at today's prices that usually points right back at Exos.
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