Re: [Xen-users] Dom0 - extremely slooooooww !!!

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On Friday 12 November 2010 23:39:09 fpt stl wrote:
> H700, if that helps.
> 
> On Fri, Nov 12, 2010 at 4:34 PM, Bart Coninckx 
<bart.coninckx@xxxxxxxxxx>wrote:
> > On Friday 12 November 2010 22:26:05 fpt stl wrote:
> > > New Dell R510, 40GB ram, 2x quad procs
> > > Dom0 allocated 2GB
> > > Two test DomUs - insignificant use.
> > > one (default) bridge
> > > rsync two lvms from mounted NFS shares - on Dom0
> > > It was running fine, but suddenly the transfer slows down to a crawl
> > > ................
> > > AND the system - Dom0 is almost non-responsive !!!!!!
> > > 
> > > Any ideas or suggestions would be greatly appreciated.
> > > 
> > > BTW, Dom0 is CentOS 5.5 64bit, the disks are RAID1 10.000rpm, Xen 3.4.2
> > > 
> > > Regards,
> > > 
> > > frank
> > 
> > Let me guess: H200 RAID controller?

In that case: no - I just had an issue with H200 controllers rendering Xen 
useless because they are terribly slow with RAID1. It seems one needs to 
enable disk caching policy after installing Dell's Openmanage Server 
Administration since this settings is not available in the card's BIOS. Even 
after that they are slower than a 4 year old Dell server with RAID1 on SATA I 
have.

Things to examine are as mentionned, top and also (you never know) a test with 
bonnie++ of the used storage.

B.

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