wenlez 6 · ID: 1 Posted January 2, 2018 I have Proxmox 5.1. Xpenology 1.02b loader; DSM6.1.4 Update 5. Intel onbard (AHCI) SATA controller passthrough. I have 3 SSD in RAID0 mode. What I notice is, the write performance on SSD is terrible. I've try to tweak Proxmox, and the Xpeno VM, but nothing seems to help. My VM config: args: -device 'piix3-usb-uhci,addr=0x18' -drive 'id=synoboot,file=/var/lib/vz/images/100/synoboot_jun2b_virtIO.img,if=none,format=raw' -device 'usb-storage,id=synoboot,drive=synoboot' bios: ovmf boot: 4 cores: 4 hostpci0: 00:17.0,pcie=1 machine: q35 memory: 6144 name: DSM6.x net0: virtio=00:11:32:xxxxxxx,bridge=vmbr0 net1: virtio=00:11:32:xxxxxxx,bridge=vmbr1 numa: 1 ostype: l26 scsihw: virtio-scsi-pci serial0: socket smbios1: uuid=7fda6843-8411-473f-91a5-xxxxxxxxx sockets: 1 I've tried to passthrough the VM without q35 machine type, and without PCE=1. Write performance is the same. Quote hostpci0: 00:17.0 What's strange is, the write performance was really good back in October, when I was still on Proxmox 5.0. So I want to ask everyone, how's your SATA passthrough performance? Share this post Link to post Share on other sites
wenlez 6 · ID: 2 Posted January 10, 2018 Looks like I solved my own problem. Enabling Write Cache in DSM is the key. 2 Share this post Link to post Share on other sites
robin 0 · ID: 3 Posted January 21, 2018 hi, glad to hear your problem is solved. would you share your synoboot_jun2b_virtIO.img ? i suppose you have embedded virtio and virtio-scsi driver? it will be great if you can share the template. thanks in advance! Share this post Link to post Share on other sites
robin 0 · ID: 4 Posted January 22, 2018 guess i solved my own problem, just follow the tutorial in this forum, and don't set CPU as host, set it to kvm64 as instructed, and everything will work. Share this post Link to post Share on other sites
