Mirrored Memory Configuration - HP ProLiant DL380 Maintenance And Service Manual

Online spare FBDIMM configuration requirements (in addition to general configuration requirements):
•
When only bank A is being used, it must be fully populated with dual-rank FBDIMMs.
•
If banks A and C are being used, they must be fully populated.
•
If installed, bank A and bank C must contain FBDIMMs with identical part numbers.
•
If installed, bank B and bank D must also contain FBDIMMs with identical part numbers.
In online spare mode, FBDIMMs must be populated as specified in the following table:
Configuration
1*
2
3
* Configuration 1 is only supported if using bank A, populated with dual-rank FBDIMMs.
After installing FBDIMMs, use RBSU to configure the system for online spare memory support.

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 general configuration requirements):
•
Banks A and B must be fully populated.
•
Bank A and bank B must contain FBDIMMs with identical part numbers. If installed, bank C and
bank D must also contain FBDIMMs with identical part numbers.
When using mirrored memory mode, FBDIMMs must be populated as specified in the following table:
Configuration
1
2
After installing FBDIMMs, use RBSU to configure the system for mirrored memory support.
Branch 0 Branch 0
Bank A Bank C
1A and 3A 2C and 4C
X —
X X
X X
Bank A Bank B
1A and 3A 5B and 7B
X X
X X
Branch 1 Branch 1
Bank B Bank D
5B and 7B 6D and 8D
— —
— —
X X
Bank C Bank D
2C and 4C 6D and 8D
— —
X X
Removal and replacement procedures 59