I wrote up a short wiki document about setting up and using the device mapper multipathing tools and LVM in Linux. Its targeted at my work environment and our EMC Clariion. However, I thought it might also be useful for others. Especially, if you suffer from the horrid PowerPath packages. Must suppress the need to rant. Also, includes instructions on the proper device nodes to use in your fstab which solves the “timing problem” that some folks have reported.