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
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