Hi, the problem with hangs and kernel dumps on my 3ware 9550SXU-4LP is solved!! Both solutions from http://lists.xensource.com/archives/html/xen-devel/2005-07/msg00431.html helped me, i.e. adding the boot parameter 'noirqbalance' or adding the boot parameter 'nousb'. Of course I prefer 'noirqbalance' so I can use the keyboard via my eric remote console. Now I can do mkfs.ext3 and lots of dd if=/dev/zero of=/tmp/deleteme-`echo $RANDOM` bs=1024 count=102400 in parallel without getting in any trouble except for a little performance bottleneck. That must be some issue with my supermicro X6DH8-G2 as this guy also had similar trouble http://lists.xensource.com/archives/html/xen-devel/2005-07/msg00440.html I'm anyways going to stay at driver version v2.26.04.010 which is being delivered with kernel-2.6.9-42.0.2.EL.src.rpm. Thanks for your help! Michael -- Michael Kress, kress at hal.saar.de http://www.michael-kress.de / http://kress.net P E N G U I N S A R E C O O L