S.M.A.R.T. in KVM on virtio drive

namron

New Member
Aug 27, 2015
19
2
1
Hi,

I use passtrough to make hdds, that are physically connected to my hypervisor available to a VM.

For example with code like this:

Code:
qm set 102 -virtio1 /dev/disk/by-id/ata-TOSHIBA_DT01ACA300_548XGR9GS

Accessing the hdd from within the VM works fine, except SMART and device info. It seems like no drive infos like vendor, serial, etc. and SMART data are passed through.

Did I miss some additional arguments in my command or is it just not possible to have it work this way?
 
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No, I haven't because I thought virtio to be superior over the other alternatives
 
I am mainly concerned with speed. Does the additional scsi layer impact performance?

If I give it a try which SCSI Controller Type should I use?
 
Allright. Changed the passthrough to SCSI and SMART works now. Thank you.

Another topic:
My host runs on an AMD A10-5700 APU. 1 socket, 4 cores.
What is an intelligent way to assign coren to 3 VMs, which experience nearly the same load?
Each VM with 1 socket, 2 cores?
 
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The overhead of multiple cores is not only on the cpu, it's also on memory. In multicore systems you often need to spawn processes for each core, so your "minimal" host with only a few "real" (user land) processes have almost doubled number of processes due to a core increase from 1 to 2 cores. This yields for more used memory - it's not that much, but it is more and you also need more CPU cycles to maintain these operations and stuff. Yet in the end, I don't think that you'll have to worry about that. As long as you have a load level in your host that is lower than the number of cores you're fine. You should not assign more cores to your VM than you physically have, but I think that's clear.

In my experience, you're almost never bound by cpu power in a virtualized system, it's always I/O or memory. If you really need that much CPU power, you would not use the low-end apu for that, but a beasty dual or quad socket 24 core Xeon :-D
 

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