Disk Requirements And Options; Switch And Communication Adapter Requirements And Options - IBM RS/6000 SP Handbook

2.3.6 Disk requirements and options

375 MHz POWER3 SMP High Nodes can have one pair of internal hard disk
drive attached through an integrated Ultra SCSI network. The node can have
either no internal hard disk drive (with external booting) or from 9.1 GB to a
maximum of 36.4 GB of mirrored, internal disk storage.
Additional hard disk drives can be attached to the 375 MHz POWER3 SMP High
Node by connecting up to six SP Expansion I/O Units. Each expansion unit has
four hard disk drive bays. For details, see Section 2.3.9, "SP Expansion I/O unit
(F/C 2055)" on page 41.
Optional internal disk devices are available as follows:
9.1 GB Ultra SCSI disk pair (F/C 2909)
18.2 GB Ultra SCSI disk pair (F/C 2918)
9.1 GB Ultra SCSI 10K RPM disk pair (F/C 3804)
18.2 GB Ultra SCSI 10K RPM disk pair (F/C 3810)
36.4 GB Ultra SCSI 10K RPM disk pair (F/C 3820)
External storage devices can be accessed through optional Ultra SCSI adapter
(F/C 6207) and SSA adapter (F/C 6230).

2.3.7 Switch and communication adapter requirements and options

If you are planning to use the 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:
375 MHz POWER3 SMP High Nodes are not supported with the SP Switch-8.
You must use the SP Switch, 16-port (F/C 4011) or the SP Switch2, 16-port
(F/C 4012).
The 375 MHz POWER3 SMP High Node is not compatible with the older High
Performance series of switches. If you install a POWER3 Wide Node into a
switch-configured system, it must use only SP-type switches.
The switch adapter for 375 MHz POWER3 SMP High Nodes does not occupy a
PCI slot; it 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.
40 RS/6000 SP and Clustered IBM ^ pSeries Systems Handbook