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C122-B001-02EN
2-11
2.3 IO_Unit
Table 2.5 IO_Unit external interfaces
2.3.1
BMM (COM port and USB port)
The BMM is a board that manages input and output of a partition. Each partition
requires one BMM. Two BMMs can be mounted in an IO_Unit:
z
Each partition requires one BMM.
z
A Video port, two USB ports, and a COM port are also mounted on the BMM.
2.3.2
HDD
The HDD is connected to the SCSI-BP (SCBP). Four U320 SCSI 3.5-inch HDDs,
which are hot-pluggable, can be mounted.
HDD mirroring is supported with optional software.
6.4, "Redundancy of an HDD (Use of PRIMECLUSTER
External interface
Count
Remarks
USB
4
Mounted on optional BMM product
RS-232C
2
SCSI
2
Ultra320-SCSI
PCI-Box interface
4
Connected to optional PCI_Box
PCI-Box interface side band 4
Connected to optional PCI_Box
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