Hi. We''ve been running Xen in production for a couple of months now, and it has been a fun and learning experience. And now we have seen some odd behaviour. We boot our dom0''s via PXE and use NFS for root-fs. Our domU''s also use NFS for everything and no swap. This allows for nice live migration. However, we are experiencing low I/O performance in the domU''s, and very often the domU''s loose the connection to the NFS server (not virtualized). The exact message is: nfs: server X.X.X.X not responding, timed out Using IOzone from a domU I''m able to provoke this to happen. IOzone in a dom0 performs much better and doesn''t result in errors in the syslog. Also, I''ve noticed, with ifconfig that the vif''s attached to the domU''s are dropping packets. monitoring this number, fx. with a ''watch ifconfig vif24.0'' indicates that is rising, fx when IOzone is running. Googling and reading xen-users list archive have not yet pointed me in the right direction. And now I''m out of ideas. Does anyone on this list have any suggestion so we can improve IO in the domU''s? We''re running Xen 3.0.3 on a debian stable with a custom kernel config. The dom0''s use eth0 for their networking, and the domU''s all bridge the eth1 interface on the physical server. /Daniel Portalen Support? Skriv til support@portal.aau.dk _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users