Thanks, another useful Linux trick I didn't know about. The amazing things I learn from this mailing list!

Alexander Benaguev wrote:
if you can access to console:
ALT+SysRq + s for sync, ALT+SysRq + u for remount all mounted fs in ro and ALT+SysRq+b for reset.
or, if your system is xen domU:
/usr/sbin/xm sysrq domU s, /usr/sbin/xm sysrq domU u, /usr/sbin/xm sysrq domU b

Alexander
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