Re: Disk activity issue...

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Hi Stefan,

Thanks for replying!  I was able to figure it out - it was not the fault of KVM.  One of the guests was running ganglia gmetad which was updating 30,000+ rrd files every 15 seconds (thus generating load via disk I/O), I didn't spot that until shutting down the VMs one by one until I found the offending one.  It was just a needle in a haystack.  ;)

Thanks again!

On Jan 4, 2011, at 2:57 AM, Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote:

> On Thu, Dec 30, 2010 at 11:25 PM, Erich Weiler <bitscrubber@xxxxxxxxx> wrote:
>> I've got this issue that I've been banging my head against a wall for a
>> while over and I think another pair of eyes may help, if anyone have a
>> moment.  We have this new-ish KVM VM server (with the latest CentOS 5.5
>> updates, kmod-kvm-83-164.el5_5.25) that houses 3 VMs.  It works mostly as
>> expected except it has a very high load all the time, like 40-60, when the
>> VMs are running.  I suspect it has to do with memory management, because
>> when all 3 VMs are online, they should consume 5GB RAM on the VM server and
>> they only consume like 2GB, so I think the rest of the RAM is swapping or
>> something, because the disks are spinning at 100% all the time (even when
>> the VMs are doing nothing).  Although, the VM server does not report any
>> swapping happening. When I shut down the VMs one by one, the load drops and
>> so does the disk activity.  I don't think I set this server up with anything
>> out of the ordinary...  I've tried rebooting, but the same thing happens
>> immediately upon reboot. Google searches, for me at least, yielded nothing
>> useful.
> 
> "very high load all the time, like 40-60"
> Is this number the host CPU utilization or load average?
> 
> Which guest OS (and versions) are you running?
> 
> Can you paste the qemu-kvm command-line for the VMs?
> 
> Can you send a few lines of "vmstat 5" output on the host while
> running the 3 VMs?
> 
> Stefan
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