One thing about ZFS GUIDs that I didn't get around tocovering is when commands like ' zpool status ' are misleading you aboutthe device names that they show.

When things are fine, ie when ZFS can find the GUID that it is lookingfor, the device name is correct (in fact hyper-correct, as ' zpoolstatus ' also checks that the device ID is the right one). When thingsare not fine, zpool will generally display the device name of the lastdevice that that GUID

To a large extent, we understand how to write bug-free programs andcode: you use and test the program until it doesn't crash or breakthings, produces the correct results, and doesn't do anything surprising(generate extra messages, pop up stray windows, and so on). There arevarious different ways to do this and people disagree about whichapproach is the most effective, but this is the broad view of how mostbug-free program development is done.

('bug-