Linux SIG and freeBSD are unix-like operating systems. The Linux SIG is led by Ron deBeck, with help from Cy and Murray. Topics for the session are often posted on the maillist of www.vlug.org.
The presentation of February 7 2015 on ZFS – The Last Word In File Systems
was derived from this PDF http://www.cs.utexas.edu/users/dahlin/Classes/GradOS/papers/zfs_lc_preso.pdf