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Same problem!! Slow write speeds and slow random read speeds in windows using samsung nvme ssd.

I was also reading this: http://jrs-s.net/2013/05/17/kvm-io-benchmarking/ IT SAYS: Conclusions In the end, the recommendation is pretty clear – a ZFS zvol with ext4, qcow2 files, and writeback caching offers you the absolute best performance. (Using xfs on a zvol would almost certainly perform...

I was actually thinking about testing the NVMe in Linux. Any recommendations on the best way to do it ?

Tested it with LVM and LVMthin no real difference. Still slow!! :(

On LVM. Also just tested using SCSI over virtio same results, the write speed and 4k speeds are terrible. (Thanks for your continued help)

Looking at that link I do have a datacenter ssd: Samsung SSD 950 PRO 512GB NVMe I also have a Samsung SSD 950 Pro that is a consumer drive that I have on another proxmox server that I will test now just to compare. But I think it's has something to do with proxmox.

Mine looks like that also in windows server 2012 r2. I just hope I can get it to be that fast using proxmox.

I just did an install using the Raw disk image and still the same results. Update: I tested with SATA and the Seq Write is up to 840MB/s. But the 4k is still 18MB/s read and 28MB/s write. I tried setting cache to write-back make slow results. Any other tips on how to speed up the write speeds...

Tested it with cache =Off. The Seq Read = 1400MB/s. The Seq Write = 500MB/s. The Seq Write is a bit faster but still nowhere where it should be (at around 1000+) The 4k is still the same at 2MB/s. Format I selected when creating VM was: QEMU image format (qcow2).

I have a Samsung 950 PRO PCIe NVMe 512gb M.2. I just installed Proxmox to test-out Windows Server 2016 in it. I went with viostor because that's the only driver during the install windows accepted, expect for SATA and IDE but they are too slow. Super fast read speeds!!! 6,550 MB/s. But crazy...