Now, I had only recently put a 1Tb Western Digital Caviar drive in the G5, so I went out an acquired a matched second so that I could run them as a RAID 1. That's when the fun started. To be brief I will dot point what did and, more importantly, did not work: Problems: * Booted G5 from OSX.4 install disk and run disk utility to set up RAID - appeared to work * Tested G5 to see if OSX.4 would install onto RAID - refused to identify RAID as bootable * Booted G5 from OSX.5 install disk and run disk utility to set up RAID - appeared to work * Tested G5 to see if OSX.5 or OSX.4 would install onto RAID - both identified RAID as bootable * Put G5 into Target Disk Mode and connected to Xserve via Firewire 400 - worked * Used Carbon Copy Cloner to clone Xserve boot partition onto G5 RAID - appeared to work * Booted G5 - did not work, could not 'see' RAID * Put G5 into Target Disk mode and booted Xserve from G5 RAID - worked * Put Xserve into Target Disk Mode and booted G5 from Xserve - worked * Booted G5 from internal RAID - still did not work! Solution: * Put Xserve into Target Disk Mode and boot G5 using Xserve boot drive - worked * Use latest Disk Utility from OSX.4.11 Server on Xserve boot drive to build RAID on G5 - worked * Use Carbon Copy Cloner to clone Xserve boot volume to G5 RAID - worked * Boot G5 from RAID - worked!! Points of interest along the way: * When using G5 in target disk mode (FW400) with Xserve controlling cloning - clocked at around 8Gb/hr * When using Xserve in target disk mode (FW400) with G5 controlling cloning - clocked at around 20Gb/hr * Using gigabit network direct between Xserve and G5 to copy data - clocked at around 100Gb/hr BTW: Checking Apple's support pages reveals that both the Xserve and G5 tower can autoswitch for crossover on gigabit ethernet - no special cable required, just a standard Cat6. So I now have a G5 that boots into OSX.4.11 Server and am happily copying my data across via gigabit ethernet. Hope this might help someone else doing similar things in the future.