[Xen] Save file location

cd /var/lib/xen/save

this is path used by xen to store virtual machine state before shutdown/reboot.

i use du -lsh /var/lib/xen/* to trace what folder make my disk space full

Before

Filesystem Size Used Avail Use% Mounted on

/dev/hda6 8.6G 8.6G 0.0G 100% /

After

Filesystem Size Used Avail Use% Mounted on

/dev/hda6 8.6G 7.1G 1.1G 88% /

Solved.