On Tue, Oct 4, 2011 at 2:24 PM, <m.roth at 5-cent.us> wrote: > Negative wrote: > > On Tue, Oct 4, 2011 at 1:18 PM, <m.roth at 5-cent.us> wrote: > >> Negative wrote: > >> > On Tue, Oct 4, 2011 at 10:41 AM, <m.roth at 5-cent.us> wrote: > >> >> Brian Mathis wrote: > >> >> > On Mon, Oct 3, 2011 at 10:16 PM, Negative > >> <negativebinomial at gmail.com > >> > > >> >> > wrote: > >> >>>> I built guest vm's one for Windows 7 and one for Windows XP using > >> >>>> the > >> >>>> virtual machine manager on a  just updated to centos 5.7, and they > >> >>>> are both crashing the host machine. They run only  for a few > >> minutes, > >> <snip> > >> >> > Is this new hardware? Have you run any hardware burn testing (CPU, > >> >> > RAM, etc...) and/or memtest86+ on the RAM? This sounds like a > >> >> > hardware issue to me. > >> > > <snip> > >> More and more it sounds like a hardware issue. Hmm, every time X is > >> running, and you say you had one video card fried - how did it fry? > >> Also, > >> is this machine on a good quality surge protector? Have you had a > >> thunderstorm, or power outages recently? > > > > The vendor told me that the particular video card model (I forget which) > > had some flaw. In any case the fan stopped running, and it heated up. I > > usually use the machine remotely but I was at the console at that moment. > > The monitor started flickering and then went gray. > > > > The vendor sent a replacement, but I had thrown an old ATI in before it > > arrived. When the crashes occurred now, I finally put in the replacement. > > Same behavior. > > Have you examined the m/b and cards *around* where the card fried? Its > heat death may have affected things around it. > It looks good to the eye. The capacitors look good. > > > > The surge protector is good. I live in NYC and the biggest environmental > > hazard is the cleaning lady, who has in the past tripped the surge > > protector switch. > > <g> Do you know the story about the mainframe shop, the racks of tapes, > and the cleaning staff? > Don't know it but I can imagine. > > > > I fear you're right about the hardware. But as far as I can tell > > everything else works fine. I went overboard in buying two quad > > processors -- so I could live with one if that's the problem. > > A replacement m/b? > > That's a tough one! Since the crashes can be duplicated and are only caused by this one combination of events, I don't know. On another machine, I had a case where none of the kvm guests would boot. It turned out to be a conflict between libvirt and the nvidia proprietary driver. I used an old version of the video driver until Nvidia caught up. (It only affected amd processors.)