RE: Network Attached Storage (NAS) 2024 Series - 2
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Is the issue with zfs on nvme it's total guesswork of the blocksize? Like you said it runs great, i'm just wondering what to look for?
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This goes into great detail about it.
Short answer:
It really isn't tuned for it, when ZFS was created there was only rust drives, so there is overhead (queuing, locking, syncs) that isn't a big deal when you have slow rust, but with nvme they add up a lot.
You can tune things to run a lot better, and the guys in the video above made a custom patch to really tune it.