1. The model 270 system unit contains one system PCI bus with one multi-adapter bridge. The bus
number is 0001.
2. There is an embedded CFIOP in the system unit backplane in position MB1.
3. Memory DIMMS are placed in pairs when more than one DIMM is present. Use the order A-B, C-D,
E-F, then G-H.
4. The following table provides information necessary to identify the IOP to which IOAs are assigned. The
left column indicates the domain in which IOA assignment is allowed. The right column is used to
determine the IOP to which an IOA is assigned. The first position in the list must be an IOP. The
remaining positions may be IOPs or IOAs. IOAs are assigned to the first IOP located to their left in the
list. Although IOAs can be manually reassigned using SST/DST, the IOA assignments return to the
default order after each IPL.
Table 6. IOA assignment rules for MB1, C01-C07
Multi-adapter bridge domain / PCI bridge set IOA assignment rules
MB1, C01 - C07 MB1, C07, C01, C06, C05, C04, C03, C02
Table 7. FRU locations and failing components for Model 270 (Processor features 23E7, 23F0, 23F1,
2452)
Position FRU name
Possible
failing
component
Type, CCIN, or part
number (use the
Type, model, and part
number list to
determine the part
number when the
type or CCIN are
given.)
Remove and replace/recovery
procedure
C01 PCI card IOA See the Type, model,
and part number list.
Go to Models 270, 800, and 810 - Cards
(dedicated).
C02 PCI card
1. IOP
2. IOA
1. CCIN is 2842 (See
page 527), 2843
(See page 527), or
2844 (See page
527)
2. See the Type,
model, and part
number list.
Go to Models 270, 800, and 810 - Cards
(dedicated).
C03 (Short if
IXS in C04)
PCI card
1. IOP
2. IOA
1. CCIN is 2842 (See
page 527), 2843
(See page 527), or
2844 (See page
527)
2. See the Type,
model, and part
number list.
Go to Models 270, 800, and 810 - Cards
(dedicated).
236 Hardware (Remove and Replace; Part Locations and Listings)
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