Poor performance inside OMV VM

[rickytan]

Hi Guys,

I am new to Proxmox.
I have been searching for an answer to my issue but nothing has worked just yet.
I am running ZFS on proxmox and after creating an OMV VM, the disk IO speed is terrible. I have created EXT4 disks inside OMV, transferring files and transfers are capping at 20M, when doing transfers direct in Proxmox or OMV when i install it baremetal i am getting around 100M, obviously this is over a network and thats the network limitation. When the transfer starts on the OMV VM it starts off around 60M+ then slowly drops and then stays at 20-30M. I have tried different linux kernels, different HBA types, all sorts.

My main goal is ZFS + OMV in a VM. Not sure if i should be passing the physical disks to the VM i just cant live with the current write speeds.

 

[Dominic]

The most important piece of information for hints about this is

qm config <vmid>

 

[rickytan]

root@proxmox:~# qm config 100
balloon: 4444
bootdisk: scsi0
cores: 4
ide2: local:iso/openmediavault_5.3.9-amd64.iso,media=cdrom
memory: 8888
net0: virtio=36:72:9F:A8:C9:88,bridge=vmbr0
numa: 0
ostype: l26
scsi0: Sonic:vm-100-disk-0,size=32G
scsi1: sonic:vm-100-disk-1,size=830G
scsihw: virtio-scsi-pci
smbios1: uuid=6780525f-800b-4912-8343-c81c98e9f064
sockets: 1
vmgenid: 50d1b818-557d-4eea-9da0-3acb89e84f12
root@proxmox:~#

really want to work this out. When installing OMV barebones it utilises the full NIC get 100M but when installing on proxmox im lucky to get around 30M. Understand there will be overheads but would expect atleast 70-80M??

Oh and this is a new machine ive installed on and getting the same issue, so new intall, new hardware - same issue.
Ive tried all the Proxmox NICs, different linux kernals in OMV, different file systems on Proxmox LVM/ZFS-thin etc all doing the same thing

 

[rickytan]

Looks like it might have been an issue with VirtIO network card. Switched to E1000 and all good

 

[Dominic]

Generally VirtIO network device should be chosen if the aim is maximum performance. Using the VirtIO network device can deliver up to three times the throughput of an emulated Intel E1000 network card. Maybe, for some reason, the correct drivers are missing in OMV?