HP ProLiant BL680c G5 Server-Blade User Manual
Page 31
Hardware options installation 31
In addition to general configuration requirements, all populated banks on a branch must contain
FBDIMMs with identical part numbers.
For online spare mode, populate the FBDIMM slots as specified in the following table:
Configuration Bank
A
Branch 0
1A, 5A
Bank B
Branch 1
9B, 13B
Bank C
Branch 0
2C, 6C
Bank D
Branch 1
10D, 14D
Bank E
Branch 0
3E, 7E
Bank F
Branch 1
11F, 15F
Bank G
Branch 0
4G, 8G
Bank H
Branch 1
12H, 16H
1*
X — — — — — — —
2
X — X — — — — —
3
X — X — X — — —
4
X — X — X — X —
5
X X X X — — — —
6
X X X X X — — —
7
X X X X X X — —
8
X X X X X X X —
9
X X X X X X X X
*Configuration 1 is only supported with dual-rank FBDIMMs.
After installing FBDIMMs, use RBSU to configure the system for online spare memory support
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Configuring online spare memory
Mirrored memory configuration
Mirroring provides protection against uncorrectable memory errors that would otherwise result in server
blade 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
soft or transient uncorrectable errors, resulting in systems that maintain mirroring protection (and thus
improved uptime) unless there is an actual hardware or FBDIMM failure. In addition, a system maintains
proper operation unless an uncorrectable error occurs on both branches.
In addition to general configuration requirements, mirrored memory FBDIMM configuration also has the
following requirements:
•
Banks A and B must be fully populated with FBDIMMs with identical part numbers.
•
Banks C and D must contain FBDIMMs with identical part numbers, if installed.
•
Banks E and F must contain FBDIMMs with identical part numbers, if installed.
•
Banks G and H must contain FBDIMMs with identical part numbers, if installed.
For mirrored memory mode, populate the FBDIMM slots as specified in the following table: