Disk performance in virtual machines is subpar

[mgiammarco]

Hello,
I have a truenas 12.0-U3.1 on real hardware: hp server with 12core xeon cpu, 64gb ram and 4 2tb sata disks (no hardware raid controller)
I have created a debian virtual machine with 4 core and 12 gb of ram.
Disk performance is terrible: I some times need half an hour to boot.
hdparm tells me read speed of disk is 3mb per sec.
I am testing now with bonnie++ but it needs 15 minutes to install.
I have tried disabling sync and compression of the zvol of the vm but I got very little improvment.
Please note that also READS are slow.
What can I do?
Thanks,
Mario

 

[sretalla]

What disk controller method are you using? AHCI?... switch to VirtIO (maybe will require a reinstall of the VM OS).

 

[mgiammarco]

Thanks forgot to say I am already using Virtio

 

[mgiammarco]

Thanks forgot to say I am already using Virtio

I have done the opposite I am using AHCI now and first tests have better results.

 

[mgiammarco]

I have done the opposite I am using AHCI now and first tests have better results.

No it is extremely unstable, on truenas I have load 0,1 on VM load 12 doing a file transfer