Compaq StorageWorks HSZ80 Configuration And Cli Reference Manual page 121

3–31
CAUTION: Never set two subsystems to the same node ID, or data cor-
ruption will occur. Each subsystem has its own unique node ID. This
name is printed on the sticker affixed to the horizontal top edge of the
Controller Card Cage above the EMU/PVA into which your controller is
inserted. If you attempt to set the subsystem node ID to a name other
than the one that came with the subsystem, the data on the subsystem
will not be accessible.
Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide