[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Dell Poweredge 2650 - heavy IO hangs domU machines; xen 2.0.7, xen kernel 2.6.11.12
This is a pretty serious problem... no bites yet? This doesn't sound familiar to anyone? It's not a bacula problem. Bacula doesn't do this to us running on unvirtualized hardware. Stephen Bosch wrote: > Hello: > > At the off-list suggestion of another user, we have tried adding > 'noirqbalance' to the xen start line in grub, we've disabled USB in the > system BIOS, and we've added 'nousb' to the kernel parameters. > > The problem is still there, exactly as before, even with all those changes. > > *All* the virtual machines lose network connectivity, not just the ones > involved in the backup. We have an LDAP server VM running on this > hardware that is totally idle when this hang happens. We cannot ping or > ssh into them. We can get a console using 'xm console', but after > entering the userid, the login times out (after 60 seconds) before we > ever get a password prompt. > > I still suspect an interrupt problem: it would appear that the tty is > unable to do a disk read to do authentication. At the same time, the > tape backup process hangs. > > If we kill the bacula storage daemon on dom0, all of the virtual > machines release and we can log in again. At no point does anything > reboot -- it just hangs, and it's not a fatal hang. If the backup > process stops, whether through a timeout or by forceably stopping the > storage daemon, the virtual machines are again pingable and we can log > in both with ssh or 'xm console'. > > We tried monitoring the memory usage during the backup test by running > 'top' in separate console windows. Loads were actually modest and there > was plenty of memory remaining on all the virtual machines (over 1 GB in > free RAM in one case). > > To recap: this is a Dell *2650*, not a 2850. It has a Serverworks, not > an Intel chipset. The RAID controller is a PERC 3 DC (LSI Logic) which > uses the Megaraid drivers. The controller firmware has been upgraded to > 3.35/1.07, the most recent available. > > Note also -- dom0 is unaffected. We can still interact with dom0 without > trouble. This hang affects only the virtual machines. > > Cheers, > > -Stephen- _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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