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

Thu Aug 11 11:45:30 CEST 2011

perhaps i got the catch here actually you might be backing up 180 GB of data
as you said your VM is 180GB in size. so backup up that amount of data will
kill your IO and chock the bandwidth. Heavy (Big virtual HD) machines as VMs
are not recommended since backup should be the problem. even-though you are
running the whole system on a Desktop machine. i am also running one machine
with the same config as yours in production. my machine contains 7 VMs
of different OS flavor Linux and windows. however all of them are lesser
then 25 GB. i am running this whole bunch for about more then 3 months and
never had the performance issue, by limiting the bandwidth and using less
GBs for Virtual Hard disks.

u can limit the bandwidth by following the instructions below..

Create the /etc/vzdump.conf file with the following content:

bwlimit: 5000

Now Fileserver part. You can use separate hardware machine for the
fileserver if you wanted to use VM just in any case then try to use NAS
solutions. there are few very good popular and free NAS solutions out there
like FreeNAS and Openfiler. i am using Openfiler you can always Attach NFS
or ISCSI to your VMs as a native facility of those NAS boxes. although ISCSI
is not recommended by me if you are using desktop machine as a NAS
BOX because you will not reach throughput of your actual LAN. anyways it is
out of topic. i hope this helps

Thank you,

On Thu, Aug 11, 2011 at 1:46 PM, Erik van Ast <Erik.van.Ast at suzohapp.nl>wrote:

> Hi Muhammad,
>
> Thank you for your reply. This might be the problem I am facing now,
> because I tested a couple of backup options and both machines are backed up
> every night.
> Does anyone have experience with this? I will search big friend Google now,
> but if someone knows what to do exactly, please let me know...
>
> Met vriendelijke groet / Kind regards / Mit freundlichem Gruß,
> _______________________________________________________________
>
> Erik van Ast (MCSE / MCSA Messaging)
> SUZO-HAPP GROUP | System Administrator
> Office: +31-(0)186-643333 | Fax: +31-(0)186-643377
> Erik.van.Ast at suzohapp.nl | www.suzohapp.nl
> _______________________________________________________________
>
> ------------------------------
>
> Message: 5
> Date: Thu, 11 Aug 2011 11:51:54 +0500
> From: Muhammad Yousuf Khan <sirtcp at gmail.com>
> To: Erik van Ast <Erik.van.Ast at suzohapp.nl>
> Cc: pve-user at pve.proxmox.com
> Subject: Re: [PVE-User] Very slow server (RAW IDE discs and KVM)
> Message-ID:
>        <CAGWVfMkRvVizxNuuYu9trVZGCUDzcFrtBOSoQ2sV3ncwi5s7dw at mail.gmail.com
> >
> Content-Type: text/plain; charset="windows-1252"
>
> Sorry for the last incomplete message
>
> Sorry if i am messing the trail as i am no means expert just a newbie in
> Proxmox.however i want to share my experience since i have been facing the
> same issue perhaps this may lead you to the solution. actually the issue was
> raised when backup job has started even after killing the "Backup Process" (
> which didn't help) face the same issue. so if you have started a backup job
> and killed that mistakenly it will not recover. i have tested that VM for a
> week but it didn't recover (maybe there is a workaround). if this is a
> problem then you can reinstall the VM otherwise best of luck for the
> appropriate answer.
>
> Thank you,
>
>
> On Thu, Aug 11, 2011 at 11:40 AM, Muhammad Yousuf Khan <sirtcp at gmail.com
> >wrote:
>
> > Sorry if i am messing the trail as i am no means expert just a newbie
> > in Proxmox.however i want to share my experience since i have been
> > facing the same issue perhaps this may lead you to the solution.
> >
> >
> > On Fri, Aug 5, 2011 at 4:10 PM, Erik van Ast <Erik.van.Ast at suzohapp.nl
> >wrote:
> >
> >> Hi all,****
> >>
> >> ** **
> >>
> >> We have a PROXMOX 1.8 server running on a ?4 x Intel(R) Core(TM)2
> >> Quad CPU
> >> Q9650 @ 3.00GHz? CPU with 8GB RAM installed. At the moment 3 virtual
> >> servers are running on it (OpenSuse 11.2, Windows 2003 and Windows
> >> 2008) and one of my servers (Windows 2003, 2GB of RAM, 2 RAW IDE
> >> discs) is being extremely slow when writing data to it. We want to
> >> use this machine as file server, so we want to copy 180GB of data to
> >> it. The copying of data is almost finished now, but it took about 4
> >> days to complete and we are on a 1Gbit connection internally so that
> >> shouldn?t make a difference. I saw that the machine is especially
> >> slow when copying large data over (like PST files), the speed than
> >> drops to 10-20Kbps instead of the multiple Mbps it should do.****
> >>
> >> At the moment 6.37 of the 8GB have been takes by the machines so RAM
> >> shouldn?t be a problem and total CPU is 50% now, so that should also
> >> be no
> >> problem.****
> >>
> >> When running task manager on the virtual server itself, nothing
> >> special is seen. No high CPU, no high RAM but the server is almost
> >> unresponsive. As soon as the server is finished copying, everything
> >> is back to normal speed
> >> ****
> >>
> >> ** **
> >>
> >> Has anyone ever seen this and does anyone know how to solve it?****
> >>
> >> Kind regards,
> >> Erik****
> >>
> >> _______________________________________________
> >> pve-user mailing list
> >> pve-user at pve.proxmox.com
> >> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
> >>
> >>
> >
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