On Tue, 2009-07-28 at 20:11 +0200, Andrea Dell'Amico wrote: > Hello, > I have a couple of Dell 2950 III, both of them with CentOS 5.3, Xen, > drbd 8.2 and cluster suite. > Hardware: 32DB RAM, RAID 5 with 6 SAS disks (one hot spare) on a PERC/6 > controller. > > I configured DRBD to use the main network interfaces (bnx2 driver), with > bonding and crossover cables to have a direct link. > The normal network traffic uses two different network cards. > There are two DRBD resources for a total of a little less than 1TB. > > 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. 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. > > Unfortunately I cannot experiment because I have production services on > those machines (and they are working fine until I start drbd on the > slave). > > drbd configuration is attached. > > Anybody has an idea of the problem? The crash is perfectly reproducible, > and drbd seems to be the problem (maybe the Xen kernel helps?). > > Thanks in advance, > Andrea > <snip sig stuff> HTH -- Bill