NEC Express5800/R320a-E4 User Manual page 62

2-26 General Description
CPU/IO Module Status
The CPU/IO module (0 or 1) started first is managed as primary, and the module started later is
managed as secondary. If one CPU/IO module is disconnected because of the failure and others,
the other module becomes primary.
The CPU/IO module to be started first is selected depending on the primary/secondary status of
modules when the server was shut down the last time.
The following devices are connected to the primary CPU/IO module by the hardware switch,
although those can be connected to both CPU/IO modules 0 and 1. When one CPU/IO module is
disconnected because of a failure, those are switched to the other module automatically and
continue operating.
VGA (display)
USB device (keyboard, mouse, floppy disk drive/Flash FDD, optical disk drive)
IMPORTANT:
If the floppy disk drive or Flash FDD is connected, the drive
letter may change from A to B by switching CPU/IO modules.
Changing of the drive letter does not affect the operation of the
server. If the drive letter is changed, access the floppy disk
drive/Flash FDD with the changed drive letter.
The drive letter of the optical disk drive is reallocated
automatically. The unused letter is allocated to the drive in the
order of D to Z. If you want to set the fixed drive letter to the
optical disk drive, specify the letter which is not allocated in the
order of D to Z after setting the hard disk drive letter..