Population Rules; Population Guidelines; Online Spare Memory Population Guidelines - HP ProLiant DL585 G7 User Manual

Population
order
Processor
memory
channel
Processor
memory
socket
Rank support
per memory
socket
Population
order
Processor
memory
channel

Population rules

When installing memory modules, observe the following population rules:
•
Use only HP memory modules listed in the DL585 QuickSpecs at the HP website
(http://www.hp.com/servers/proliant).
•
Advanced ECC is not available if x4 and x8 memory modules are mixed in channels (A and B), (C and
D), or both, but standard ECC is still available. Advanced ECC is available if x4 and x8 memory
modules are mixed in memory channels (A and C), (B and D), or both.

Population guidelines

While adhering to the memory population rules
improved by following the guidelines below:
•
Memory modules may be installed one at a time per processor, but installing two at a time per processor
provides for additional performance and installing four at a time per processor provides for better
performance.
•
For optimal performance, install equal amounts of memory for both processors.
•
For best performance, install all memory modules of the same speed on the same processor.
•
For best power, install all memory modules of the same voltage on the same processor.

Online Spare memory population guidelines

Online spare memory provides protection against persistent DRAM failure. It monitors DIMMs for excessive
correctable errors and copies the content of an unhealthy rank to an available spare rank in advance of
multi-bit or persistent single-bit failures that may result in uncorrectable faults. Rank-sparing is more efficient
than DIMM-sparing since only a portion of a DIMM is set aside for memory protection.
A I
A A
7 8
SR/DR SR/DR/QR
B J
C C
E C
A B
9 10
SR/DR SR/DR
F D
C D
("Population rules" on page 44), performance can be
K G
B B
11 12
SR/DR/QR SR/DR
L H
D D
Hardware options installation 44