BR0
BR0
BR1
BR1
DIMM 7
DIMM 8
DIMM 9
CH2
DIMM 7
DIMM 8
DIMM 9
CH2
DIMM 10
DIMM 11
DIMM 12
CH3
DIMM 10
DIMM 11
DIMM 12
CH3
Rank 0
Rank 0 512 MB
Rank 4 1 GB
Rank 2 512 MB
Rank 1
Rank 1 Empty
Rank 5 Empty
Rank 3 512 MB
Minimum configuration: one pair of DIMMs
Other Configuration: Multiple Pairs of DIMMs
(Branch 0 works independently of Branch 1)
(Branch 0 works independently of Branch 1)
Rank 4 is used to spare any defective rank of rank 0, 2, and 3
A pair of two identical
double rank modules:
same size, speed,
and organization
Rank 1 is sparing to Rank 0
DIMM 1
DIMM 1
DIMM 2
DIMM 2
DIMM 3
DIMM 3
CH0
CH0
DIMM 4
DIMM 4
DIMM 5
DIMM 5
DIMM 6
DIMM 6
CH1
CH1
A pair of two identical
single rank modules
(512MB)
A pair of two identical
single rank modules
(1GB)
A pair of two identical
double rank modules
(1GB)
- A rank is defined as an area or block of 64 bits that is created by using
some or all of the chips on a DIMM. For an ECC DIMM, a memory rank is
a block of 72 data bits (64 bits plus 8 ECC bits).
- The minimum memory configuration is two single-rank DIMMs that are
installed in branch 0, DIMM connector 1 (in channel 0) and connector 4 (in
channel 1); however, online-sparing is not supported with this configuration.
- To support online-sparing in branch 0, you must add a second pair of
DIMMs. The spare pair of DIMMs can be single-rank or double-rank and
must be the same speed, type, size (or larger), and technology as the
failed pair of DIMMs. The spare pair must be installed in branch 0, DIMM
connector 2 (in channel 0) and connector 5 (in channel 1). Branch 0 and
branch 1 operate independently.
v The following notes apply when the server operates in non-mirroring mode
(normal mode):
– DIMMs must be installed in matched pairs. If you install a second pair of
DIMMs in DIMM connector 7 and DIMM connector 10, they do not have to be
the same size, speed, type, and technology as the DIMMs in DIMM connector
Chapter 4. Removing and replacing server components 69
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