Mirrored memory configuration, Installing fbdimms – HP DL580 User Manual
Page 42
Hardware options installation 42
Configuration Bank
A
1A/5A
Bank B
9B/13B
Bank C
2C/6C
Bank D
10D/14D
Bank E
3E/7E
Bank F
11F/15F
Bank G
4G/8G
Bank H
12H/16H
5
X X X X X X X X
* Configuration 1 is only supported if bank A is populated with dual-rank FBDIMMs.
After installing FBDIMMs, use RBSU to configure the system for online spare memory support
("
Configuring online spare memory
Mirrored memory configuration
Mirroring provides protection against uncorrectable memory errors that would otherwise result in server
downtime.
Mirroring is performed on the branch level. Branch 0 and branch 1 mirror each other.
Each branch maintains a copy of all memory contents. Memory writes go to both branches. Memory
reads come from only one of the two branches (unless an uncorrectable error occurs). If a memory read
on one branch returns incorrect data due to an uncorrectable memory error, the system automatically
retrieves the proper data from the other branch. A branch is not necessarily disabled (thus losing
mirroring protection) because of a single uncorrectable error. Mirroring protection is not lost because of
transient and soft uncorrectable errors, resulting in systems that maintain mirroring protection (and thus
improved uptime) unless there is a failure of both branches.
Mirrored memory FBDIMM configuration requirements (in addition to the general configuration
requirements):
•
Banks A and B must be fully populated at a minimum.
Mirrored memory supports the following FBDIMM configurations:
Configuration Bank
A
1A/5A
Bank B
9B/13B
Bank C
2C/6C
Bank D
10D/14D
Bank E
3E/7E
Bank F
11F/15F
Bank G
4G/8G
Bank H
12H/16H
1 X
X
2
X X X X
3
X X X X X X
4
X X X X X X X X
After installing FBDIMMs, use RBSU to configure the system for mirrored memory support ("
Installing FBDIMMs
1.
Power down the server (on page
2.
Remove the processor memory module, and open the cover ("
3.
Open the FBDIMM slot latches.