HP BL480c HP ProLiant BL480c Server Blade User Guide - Page 35

Mirrored memory configuration, Installing FBDIMMs

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Page 35 highlights

After installing FBDIMMs, use RBSU to configure the system for online spare memory support ("Configuring online spare memory" on page 50). 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 transient and soft uncorrectable errors, resulting in systems that maintain mirroring protection (and thus improved uptime) unless there is a failure of 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. For mirrored memory mode, populate the FBDIMM slots as specified in the following table: Configuration 1 2 3 Bank A 1A, 4A X X X Bank B 7B, 10B X X X Bank C 2C, 5C - X X Bank D 8D, 11D - X X Bank E 3E, 6E - - X Bank F 9F, 12F - - X After installing FBDIMMs, use RBSU to configure the system for mirrored memory support ("Configuring mirrored memory" on page 50). Installing FBDIMMs To install the component: 1. Power down the server blade (on page 14). 2. Remove the server blade (on page 15). 3. Remove the access panel (on page 15). Hardware options installation 35

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Hardware options installation 35
After installing FBDIMMs, use RBSU to configure the system for online spare memory support
("
Configuring online spare memory
" on page
50
).
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
transient and soft uncorrectable errors, resulting in systems that maintain mirroring protection (and thus
improved uptime) unless there is a failure of 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.
For mirrored memory mode, populate the FBDIMM slots as specified in the following table:
Configuration
Bank A
1A, 4A
Bank B
7B, 10B
Bank C
2C, 5C
Bank D 8D,
11D
Bank E
3E, 6E
Bank F
9F, 12F
1
X
X
—
—
—
—
2
X
X
X
X
—
—
3
X
X
X
X
X
X
After installing FBDIMMs, use RBSU to configure the system for mirrored memory support ("
Configuring
mirrored memory
" on page
50
).
Installing FBDIMMs
To install the component:
1.
Power down the server blade (on page
14
).
2.
Remove the server blade (on page
15
).
3.
Remove the access panel (on page
15
).