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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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?
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.