Piper was sounding very unhappy. It's still in the rack, but strongly recommended you don't use it. As such it has been retired, probably indefinitely.
The PERC 3/Di card takes some time to initialise between loading the driver and the raid array becoming available. As such the LVM script in the boot sequence was running before the drive was available, so it failed to load the LVM volume groups, and the machine failed to boot. It needs rootdelay=15 on the kernel command line.