After a previous discussion here I moved our system to b124 and this appearded to be OK until about 10 days ago. Since then we have had 3 occurences of the network hanging for one of the domUs (solaris 10u7) A reboot sorts it but what I wanted to ask is: 1) apart from a kstat -p xnbo on the dom0 is there any other data I can colect to help debug this. 2) a colleague who uses xen on Linux said that the recommendation is to have at least 45% of physical memory allocated to dom0. This seems excessive, I''ve allocated 2Gb of an 8Gb machine to a dom0 with 4 domUs I know every situation is diferent but should this be OK? Thanks John -- John Landamore Department of Computer Science University of Leicester University Road, LEICESTER, LE1 7RH J.Landamore@mcs.le.ac.uk Phone: +44 (0)116 2523410 Fax: +44 (0)116 2523604