NonStop S-Series Server Description Manual (G06.27+)

Introduction
HP NonStop S-Series Server Description Manual—520331-004
1-14
Maximum Processor Enclosure I/O
Maximum Processor Enclosure I/O
A single processor enclosure can support 16 disk drives using the two SCSI buses,
and in addition provides two differential SCSI ports, two Ethernet ports, and any I/O
devices connected to two ServerNet adapters. Figure 1-8 shows this maximum
configuration for one processor enclosure.
There is a slight difference in the way this I/O capability is managed by different
MFIOBs. The NonStop S7600, S74000, S76000, and S86000 servers use MFIOB 2
boards, in which an additional router port is available and is used to provide a separate
ServerNet bus interface (SBI) for the disk drives on the SCSI buses. NonStop S7000,
S7400, S70000, and S72000 servers, use original MFIOBs, in which the disk drives
are managed through the same SBI as the Ethernet ports and differential SCSI ports,
as shown in Figure 1-7.
ServerNet adapters always have a ServerNet bus interface (SBI) for connecting to the
ServerNet routers and one or two ServerNet addressable controllers (SACs). The SAC
is specialized to the type of input/output service provided, such as SCSI, ethernet, and
so on. As shown in Figure 1-3 on page 1-7, ServerNet adapters are installed in slots 51
through 54.
Note that one unused router port is available in each of the MFIOBs. This port is
reserved for expanding the ServerNet fabric. See Expansion to Second Processor
Enclosure on page 1-16.
Figure 1-7. Alternate Configuration of MFIOBs for NonStop S7000, S7400,
S70000, and S72000 Servers
Multifunction
I/O Board
Multifunction
I/O Board
ServerNet Bus
Interface (SBI)
ServerNet Bus
Interface (SBI)
Differential
SCSI Port
Differential
SCSI Port
X Y
SCSI
SAC
SCSI
SAC
SCSI
SAC
SCSI
SAC
SCSI
SAC
SCSI
SAC
Ethernet
Port
Ethernet
Port
Ethernet
SAC
Ethernet
SAC
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