fence_zvm(8) on Linux
The text 773a27aaa3c2, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
I/O Fencing agent for GFS on s390 and zSeries VM clusters
Flags it lists
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-S -
-V -
-a -
-h -
-p -
-q -
-u