Chapter 2. SP internal processor nodes
47
2.4.7 Switch and communication adapter requirements
If you are planning to use a switch in your SP system, you need switch adapters
to connect each RS/6000 SP node to the switch subsystem. SP switch adapters
have several characteristics and restrictions, including the following:
Switch adapters
The switch adapter for 375 MHz POWER3 SMP Wide Nodes does not occupy a
PCI slot. The switch adapter for these nodes is installed into the Mezzanine bus
(MX). The MX bus connects the I/O planar with the system planar. Placing the
switch adapter in the MX bus enables switch traffic to proceed at higher
bandwidths and lower latencies.
In switch-configured systems, 375 MHz POWER3 SMP Wide Nodes require SP
Switch MX2 adapter (F/C 4023).
Switch restrictions
375 MHz POWER3 SMP Wide Nodes are not compatible with the older High
Performance series of switches. If you install this node into a switch-configured
system, you must use an SP Switch or an SP Switch-8.
Switch adapters for these nodes are not interchangeable with either the switch
adapters used on uniprocessor wide nodes or with the SP Switch MX adapter
used on 332 MHz SMP nodes.
I/O adapters
The 375 MHz POWER3 SMP Wide Nodes have 10 PCI (Peripheral Component
Interconnect) adapter slots. A full line of PCI adapters is offered for these nodes
including:
SCSI-2
Ethernet
Token Ring
FDDI
ATM
Async
Wide Area Network (WAN)
SSA RAID5
S/390 ESCON
Serial HIPPI
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