IBM i series Handbook page 151

• #0551 iSeries Rack
– Up to two iSeries server 270s may be installed in a #0551 rack.
– Any iSeries server 270 being mounted in a #0551 must have the #7104 System Unit
Expansion.
– Certain upgrade paths are not supported when an iSeries server 270 is mounted in a
rack. See "Model 270 Upgrades" on page 130 for valid upgrade paths.
– Specify codes and features supported when used in conjunction with an iSeries
server 270 are:
• #0121 Lower Unit in Rack Specify
• #0122 Upper Unit in Rack Specify
• #0127 Field Install in Rack Specify
• #1422 Power Distribution Unit (PDU) Line Cord
– See "#0551 iSeries Rack" on page 266 for a complete description of the #0551
iSeries Rack and supported features and specify codes.
• #7002 HSL Enabler
– The #7002 is a feature High Speed Link (HSL) internal flex cable, which enables
connection to a #5075 PCI Expansion Tower.
– Can be ordered on the Model 270 with processor #2431 only.
– This cable connects the processor with a right angle bus connector to the back of the
machine. Two HSL cables (#14XX) are required to connect the CEC to the expansion
tower.
Note : Certain processor upgrades are "roll-in/roll-out" system upgrades. On these
upgrades, an RPO remove of the #7002 must be done because the new system unit
comes standard with an internal flex cable. To identify "roll-in/roll-out" upgrades, see
"Model 270 Upgrades" on page 130.
• #7104 System Unit Expansion
– The #7104 is a feature system unit expansion that allows up to an additional 12 disk
units to be added to the Model 270. The #7104 has no PCI card slots and no
removable media slots.
– The #7104 comes with support for six disk units standard and requires a #7123 when
installing over six disk units.
– The #7104 disk units are driven by a disk unit controller located in the CEC.
– A #7133 DASD Concurrent Maintenance Cage is required for processors #2431 to
support a #7104.
– A separate power cord is required for the #7104.
iSeries Server 270
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iSeries Server 270