On Jul 29, 2009, at 7:52 AM, "Andrea Dell'Amico" <adellam at sevenseas.org> wrote: > On Tue, 2009-07-28 at 14:31 -0400, William L. Maltby wrote: > >>> When the two hosts are in sync, if I activate more than a few (six >>> or >>> seven) xen guests, the master server crashes spectacularly and >>> reboots. >>> >>> I've seen a kernel dump over the serial console, but the machine >>> restarts immediately so I didn't write it down. >> >> If you have an available pc, hook it up in place of the serial >> console >> and start a terminal emulator, e.g. minicom or whatever you prefer, >> and >> turn on full logging. This should save everyting in a file that you >> can >> then review. > > Uhm. The console is on the DRAC5 card. I think I would need to > activate > some network kernel crash dump feature. > >> If it's a Windows based, just remember to get rid of the ^M with >> dos2unix, or equivalent, after you send it to a *IX box. >> >> I don't know anything about the rest of your problem, sorry. > > As I wrote, it's a production server. I cannot stop it when I want, I > need to reserve a weekend session. > In the meantime, I was asking if there's a known problem with a setup > like mine. I read on another forum how a user using iSCSI for domUs was experiencing network hangs due to the fact that dom0 didn't have enough scheduler credits to handle the network throughput. That might be related. http://lists.centos.org/pipermail/centos-virt/2009-June/001021.html -Ross