Fujitsu D2860 Technical Manual page 18

Main memory
The channels A - C are controlled by CPU 1 and the channels D - F are
controlled by CPU 2.
x4 or 8 x organized registered DIMMs with ECC are supported.
There are four operational modes for the main memory:
– Independent channel mode (maximum population)
The populated memory of the six channels (A - F) can be used completely
(max. 72 GB).
– Mirrored channel mode (maximum security)
Only the populated memory of the two channels A and D can be used (max.
24 GB). The channels B and E serve as safeguarding against failure. The
memory belonging to the channels B and E contain the mirrored data of the
memory belonging to channel A and D. The channels C and F are not used.
– Performance channel mode (maximum performance)
The populated memory of the six channels (A - F) can be used completely
(max. 72 GB).
– Spare channel mode (large population and large security)
Only the populated memory of the four channels A, B, D and E can be used
(max. 48 GB). The channels C and F serve as safeguarding against failure.
Depending on the mode of operation there are different population require-
ments for the main memory.
18 Technical Manual
Features
D2860 (BX920)