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

info at fabianschuetze.de info at fabianschuetze.de
Fri Aug 5 13:28:47 CEST 2011


Login via ssh / Console to your proxmox host and execute 


You should see a "x.x%wa" in the "Cpu" line.
If it is very high, the
HDD's are too slow/busy to write the files. 


On Fri, 5 Aug
2011 13:10:54 +0200, Erik van Ast 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
> Erik

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