1. A

    [SOLVED] Only 8xMB/s writes when SATA controller is passed through

    Hi all, I tried to PCI passthrough a SATA controller (not the onboard one) to my vm and found a significant performance drop, the write speed was dropped to 8x MB/s. But when I mount it directly on PVE, the writing speed came back to normal. Can someone help me on this issue? Thank you! Here...
  2. A

    ceph rbd slow down read/write

    Summary: pve-manager/5.3-5/97ae681d (running kernel: 4.15.18-9-pve) ceph version 12.2.8 (6f01265ca03a6b9d7f3b7f759d8894bb9dbb6840) luminous (stable) 4 nodes (per node: 4 nvme ssd & 2 sas ssd, bluestore) + 1 node with 4 sata ssd interconnect - 2x 10Gbps Created pool (512 PGs, replicated 3/2) on...
  3. C

    Ubuntu Xenial/Bionic kernel 4.13/4.15 virtio-scsi direct sync 4k write performance regression

    Hi Proxmoxers, Just found out today that when using Ubuntu Xenial kernel 4.13, the direct synchronous write performance is 93% slower than on kernel 4.4. Kernel 4.13 direct sync 4KB write could only achieve 303KB/s while kernel 4.4 could achieve 4.5MB/s. The VM is using ext4 filesystem and...
  4. G

    Extremely poor write performance

    I am using latest proxmox 4.4-13 , 3 cluster setup with freenas NAS box with NFS and SMB shares NFS shares for VM disks (mounted on proxmox) On 2 different servers, running 2 different OSes (win 7 and win 10) with different file formats - RAW vs qcow2 and even different controllers (SATA vs...
  5. M

    Windows Server 2016 Slow Write Speeds on NVME SSD?

    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...


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