I was able to get multipathing to work on the Linux installation to the EMC VNX SAN disc. It wasn enabled automatically by the installation routines. The SAN team modified a setting in the EMC box (they didn't tell me what they changed) and asked me to reinstall SLES 11 SP3. When Linux booted at the end of the install, multipathing was enabled.

I also installed Linux onto an IBM SAN disc and multipathing was enabled by the installation routines there as well.

A bug report was opened for the syntax error in /usr/share/doc/packages/multipath-tools/multipath.conf.defaults but I haven't heard of when a fix will be issued.