IO Delay drill down

[ricardoj]

Hi there,

Is anyone able to drill down IO delay like per VM ?

I'm trying to find which VM is generating the most IO cycles to fine tuning VM and / or environment.

Even using external tools from VM or from PVE.

I,m running PVE 5.2 with ZFS in a single server

Thanks in advance,

Ricardo Jorge

 

[Richard]

Is anyone able to drill down IO delay like per VM ?

Since "IO delay" is effected by the sum of all VMs (and other processes) running at a Proxmox it cannot be assigned to particular VMs.

But it's possible to get the disk IO as amount of (k)bytes - thus is shown in the "Summary" tab of a VM. If you compare these figures from a certain period (with a significant IO delay) to each other you can conclude which of the VMs may have caused it.

 

[ricardoj]

Hi Richard,

Thank you for your input.

What I'm trying to achieve is an automated way to find which VM is creating the "pressure" over IO.

Let's see if I can find a way to export each VM disk IO info and compare with IO Delay total.

Best Regards,

Ricardo Jorge

 

[ricardoj]

Hi,

I think the easy way to look at I/O is using iotop

One just need to install it ( apt install iotop ) and run it from command line, like this :

iotop -o

Now you can see process consuming I/O.

Regards,

Ricardo Jorge