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The recording of the October 1st, 2025 #OpenZFS Production User Call is up:
We discussed the upcoming User and Developer Summit, libzfs, 'zfs diff' behavior, orphaned files, extended attributes, metadata handling, stream(8), flash-native OpenZFS, a hypothetical S3 front-end for the OpenZFS object store, reproducible workloads, drama generators, and more!
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@dexter I'm sad that I missed today's meeting, having been looking forward to it from the weekend's doc revisions.
@robn sounds like I'll need to watch the discussed S3 Obj API. I've been using this in an upstream manner via memory grid which caches writes back to ZFS, and the usual other calls.
I do have an overview about ZFS latency performance layers when using NVDIMM, vs gen5 SLC vs MLC/TLC (go away QLC, no one likes you even when distributing massive writes in parallel using sequential fan-out on top of kernel mode multipathed NFS — cost analysis shows prudence, but personal ethics say otherwise).
Involved with the above, there are some brief points on tuning system profiles for SPDK and NVME-oF (also RoCEv2, no IB today).
oh, I'm getting some more Connectx-6 era Bluefields to run additional scale-model tests and have additional control over line-rate I/O capture for our replay processing... on which it's nice to have 16GB on the DPU. So much to do, need more machines. ☺️
@winterschon @robn Well, minutes, recordings, and a consistent cadence to the rescue.
I yapped pretty hard about my own thoughts and opinions on some #OpenZFS stuff today, including:
- how we could make `zfs diff` nicer by tracking all hardlink parents
- some of the stuff that OpenZFS knows internally but doesn't currently expose to userspace, but could if anyone asked
- per-vdev queue tuning via properties instead of global tunables
- initial musings on a dataset type that exposes a S3-compatible API
- the size and scope of a flash-friendly redesign
On that last, the simplest and most important question was asked: how much $$$? I've been thinking about that all morning; not just the amount, but how there are people out there with cash that actually want stuff, but they aren't just gonna hand it out without a plan. This is obvious, but I'm just a tiny baby in the programmer-for-hire world; I learn slowly 😅 Some ideas are brewing, more on that soon I hope.
Thanks @dexter for the platform (and the patience; he's been subject to similar yaps from me in private, and is always a thoughtful and gracious host)!
Yes @wollman, you got a LOT of mentions today.
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