100 SPARC Enterprise Mx000 Servers Administration Guide • August 2009
I/O Device Mapping
I/O device paths are dictated by which LSB the I/O unit is assigned to.
Entry-level servers have one I/O controller. The XSB is assigned four PCIe slots.
Midrange servers have only one I/O controller on the I/O unit (IOU). For an XSB in
Uni-XSB mode, all I/O is on XSB#xx-0. For an XSB in Quad-XSB mode, internal
resources, the PCI-X slot, and two PCIe slots are on XSB#xx-0, and two PCIe slots are
on XSB#xx-1.
High-end servers have two I/O controllers; therefore, each XSB can have two PCIe
slots assigned to it.
TABLE A-2 shows the LSB numbers and the corresponding device path values that are
used in I/O device mapping on the server.
TABLE A-2 LSB Numbers and Device Path Values
LSB Number Device Path Value
00 No value
01 1
02 2
03 3
04 4
05 5
06 6
07 7
08 8
09 9
10 a
11 b
12 c
13 d
14 e
15 f
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