Find the offending VDI
xe vdi-list
Find the VBD
xe vbd-list vdi-uuid=
unplug the vbd
xe vbd-unplug uuid=
destroy the VBD
xe vbd-destroy uuid=
Find the offending VDI
xe vdi-list
Find the VBD
xe vbd-list vdi-uuid=
unplug the vbd
xe vbd-unplug uuid=
destroy the VBD
xe vbd-destroy uuid=
/opt/xensource/libexec/xen-cmdline –set-xen dom0_mem=4096M,max:4096M
http://linux.ardynet.com/ipv6setup.php
/usr/lib/xen/bin/host-cpu-tune