[PVE-User] WG: Very slow server (RAW IDE discs and KVM)

Holger Ernst he at ernstdatenmedien.de
Mon Aug 8 13:06:24 CEST 2011

can you install 'atop' into the vm? It shows much more specific data about network and disk io (kernel paches not needed).
Your transfer speed is very slow so i would focus on network problems. Poor caching shouldn't be SO slow.

Regards, Holger

-----Ursprüngliche Nachricht-----
Von: pve-user-bounces at pve.proxmox.com [mailto:pve-user-bounces at pve.proxmox.com] Im Auftrag von Erik van Ast
Gesendet: Montag, 8. August 2011 12:06
An: CoolCold
Cc: pve-user at pve.proxmox.com
Betreff: Re: [PVE-User] Very slow server (RAW IDE discs and KVM)

Yes, after the changes I have shut down and after that restart the

Kind regards,

-----Oorspronkelijk bericht-----
Van: CoolCold [mailto:coolthecold at gmail.com] 
Verzonden: maandag 8 augustus 2011 11:55
Aan: Erik van Ast
CC: pve-user at pve.proxmox.com
Onderwerp: Re: [PVE-User] pve-user Digest, Vol 41, Issue 4

On Mon, Aug 8, 2011 at 1:52 PM, Erik van Ast <Erik.van.Ast at suzohapp.nl>
> Hi all,
> @Fabian and @CoolCold thank you for your reply.
> I have connected with putty (SSH) and ran #top.
> I see 4 CPU lines (CPU0-CPU4) and the max I have seen now during 5 
> minutes of watching it is 15%, but most of the times, it's 1 Cpu doing

> 4% and 1 doing 2%, so I presume that's not the problem?
> I also edited the .conf file located in /etc/qemu-server and I have 
> tried both " ide0: local:108/vm-108-disk-1.raw,cache=writethrough" and
> ide0: local:108/vm-108-disk-1.raw,cache=none" but with both configs I 
> didn't see any major improvements.
I hope you did virtual machine restart after that changes?

 The virtual server has been installed
> with 2 virtual discs, 1 of 40GB and the second with 200GB.
> The machine is especially slow when copying large data over, than the 
> speed drops to about 30-70 Kbyte/sec instead of at least 20
> Anyone seen this before? Help is greatly appreciated...
> Kind regard,
> Erik


Best regards,

This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
pve-user mailing list
pve-user at pve.proxmox.com

More information about the pve-user mailing list