Table of Contents
Advertisement
memory with two microprocessors installed (using 16 GB DIMMs). The DIMMs
can be installed without matching sizes. See the table below for the memory
installation order.
Table 3. Independent channel mode DIMM installation sequence
One microprocessor installed
DIMM connectors 5, 3, 1, 6, 4, 2
v Rank sparing mode: In rank-sparing mode, one memory DIMM rank serves as a
spare of the other ranks on the same channel. The spare rank is held in reserve
and is not used as active memory. The spare rank must have identical or larger
memory capacity than all the other active memory ranks on the same channel.
After an error threshold is surpassed, the contents of that rank is copied to the
spare rank. The failed rank of memory is taken offline, and the spare rank is put
online and used as active memory in place of the failed rank.
Note: Rank sparing mode is supported if the blade server meets one of the
following memory requirements:
– One quad-rank DIMM
– More than one DIMM per channel
– An even number of single-rank or dual-rank DIMMs
For rank sparing mode memory installation order on a blade server with
quad-rank DIMMs, see Table 3.
The following tables show the order that single-rank or dual-rank DIMMs are
installed to use rank sparing mode:
Table 4. Rank sparing mode DIMM installation sequence for single-rank or dual-rank DIMMs
(one microprocessor)
DIMM pair
First
Second
Third
Table 5. Rank sparing mode DIMM installation sequence for single-rank or dual-rank DIMMs
(two microprocessors)
DIMM pair
First
Second
Third
Fourth
Fifth
Note: In rank sparing mode, if any of the installed DIMMs does not meet the
requirements listed above, the system is executed as independent channel mode.
v Mirrored channel mode: In mirrored channel mode, memory is installed in
pairs. Each DIMM in a pair must be identical in capacity, type, and rank count.
The channels are grouped in pairs with each channel receiving the same data.
Two microprocessors installed
DIMM connectors 5, 11, 3, 9, 1, 7, 6, 12, 4, 10,
2, 8
DIMM connector
5, 6
3, 4
1, 2
DIMM connector
5, 6
11, 12
3, 4
9, 10
1, 2
7, 8
Chapter 5. Removing and replacing blade server components
67
Advertisement
Table of Contents
