IBM BladeCenter HS22V 7871 - Page 84

v Spare channel mode: In Spare Channel Mode, channel 2 is the spare of the
active channels 0 and 1. Channel 5 is the spare of the active channels 3 and 4.
The spare channel is not available as active memory. When using spare channel
mode, two-thirds of the installed memory is available as active memory. The
maximum memory available (with 16 GB dual-rank DIMMs) is 96GB in a
single-microprocessor system and 96 GB in a dual-microprocessor system. All
three channels must have identical population with regards to size and
organization. DIMMs within a channel do not have to be identical. The
population ordering for Spare Channel Mode is shown in the table below.
Note: Spare channel mode is only supported if the blade server has an Intel
Xeon 5600 series microprocessor. Use the Setup utility to view the system
summary and verify the type of microprocessor installed in your blade server
(see “Using the Setup utility” on page 20).
The following table shows the order that memory DIMMs are installed to use
spare channel mode.
Table 7. System memory configuration for spare channel mode (1 microprocessor)
Installed
memory
DIMM socket
1 2 3 4 5 6 7 8 9 101112131415161718
3
DIMMs
XXX
6
DIMMs
XX XX XX
9
DIMMs
X
1
XXX
1
XXX
1
XX
1. Not supported when a quad-rank DIMM is installed.
Table 8. System memory configuration for spare channel mode (2 microprocessors)
Installed
memory
DIMM socket
1 2 3 4 5 6 7 8 9 101112131415161718
6
DIMMs
XXXXXX
9
DIMMs
XX XX XX X X X
12
DIMMs
XX XX XX XX XX XX
15
DIMMs
X
1
XXX
1
XXX
1
XX XX XX XX
18
DIMMs
X
1
XXX
1
XXX
1
XXX
1
XXX
1
XXX
1
XX
1. Not supported when a quad-rank DIMM is installed.
68 BladeCenter HS22V Type 7871 and 1949: Problem Determination and Service Guide