The information Apple provides to automount Xsan to SNFS is dated for Xsan 1.4.2.
Xsan 1.4.2 uses the automount.plist file to mount SAN volumes. In order to mount the SNFS filesystem after each reboot of the OS X computer, configure the automount.plist file.
Create /Library/Filesystems/Xsan/config/automount.plist using this template, and change fsname to the name of your filesystem.
A template is available for download here: Xsan automount.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Volume_name</key>
<dict>
<key>AutoMount</key>
<string>rw</string>
<key>MountOptions</key>
<dict/>
</dict>
<key>Another_volume_name</key>
<dict>
<key>AutoMount</key>
<string>rw</string>
<key>MountOptions</key>
<dict/>
</dict>
</dict>
</plist>
Details on configuring OS X to connect to SNFS are below.