Hello! I've read a lot of threads about people trying to get full speed from their nvme drives. So i'm wondering how does nvme tuning looks on zfs? I have several PVE appliances with nvme mirrors and now i suspect that they don't reach full speeds.
ZFS pools on NVME
- Thread starter Vasilij Lebedinskij
- Start date
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- Tags
- nvme performance zfs
not good.
Zfs does not cache writes.
just use bcache . or flashcache (almost deprecated but still fast).
another problem is that the NWME is a special interface on the shortened path.
Not the worst idea is the container where the nvme is thrown inside container.
Even NVME parition throughout virtio drive still reduces write ios 2-3 times (in my tests)
Zfs does not cache writes.
just use bcache . or flashcache (almost deprecated but still fast).
another problem is that the NWME is a special interface on the shortened path.
Not the worst idea is the container where the nvme is thrown inside container.
Even NVME parition throughout virtio drive still reduces write ios 2-3 times (in my tests)
Depends also heavily on the kind of NVME drive you're using. Enterprise grade Flash is much better than Prosumer hardware like the Samsung 960 pro and such.
In my case I use Samsung EVO 970. I'm wondering what block size should I choose when I create zfs pools and there is plenty pool options with also impact performance. And what about IO threading? How is it managed in Proxmox? How may I know if all my SSD's available threads are used?
The Pro is already not very good, I have no numbers of the EVO. Best to check for raw performance here:
http://www.sebastien-han.fr/blog/20...-if-your-ssd-is-suitable-as-a-journal-device/
These type of "cheap" SSDs cannot be tuned (sanely) in ZFS for best performance, because their write speed is not good.