User`s guide

9-86
The online spare memory feature can be used under the following conditions:
 Install memory devices to more than one group in each memory branch. The server can operate if the memory
branches may be different in the number of DIMMs. For example, no error occurs if memory branch 0 include
four DIMMs (or two groups) and memory branch 1 includes six DIMMs (or three groups).
 DIMMs installed in a specific memory branch should have the same capacity. The server can operate as long
as DIMMs of the same capacity are installed in each memory branch. (For example, the server can operate if
the total capacity of memory branch 0 is different from that of memory branch 1.)
 Run SETUP (see Chapter 4), change parameters appropriately in the [Sparing] menu selected as shown below,
save the settings and exit from SETUP.
[Advanced] → [Memory Configuration] → [Sparing]
 Install memory devices in the following order:
Group 1 → Group 3 → Group 5 for memory branch 0
Group 2 → Group 4 → Group 6 for memory branch 1
The following sparing can be neither configured nor set.
 Sparing to anther memory branch
 Specification of arbitrary memory devices as spare. The group of the largest number within a specific memory
branch can be specified as spare.
The table below lists examples of DIMM installation patterns enabling the online spare memory feature to be used.
While the following patterns are provided for memory branch 0, the same patterns can also be adapted to memory
branch 1.
Memory Blanch #0
(Group #)
Capacity
Example
#1 #3 #5 Physical Logical
1 1 GB 1 GB - 4 GB 1 GB
2 1 GB 1 GB 1 GB 3 GB 2 GB
3 2 GB 2 GB - 4 GB 3 GB
4 2 GB 2 GB 2 GB 6 GB 5 GB
5 4 GB 4 GB - 8 GB 6 GB
6 4 GB 4 GB 4 GB 12 GB 10 GB
7 8 GB 8 GB - 16 GB 12 GB
8 8 GB 8 GB 8 GB 24 GB 20 GB
Depending on the specifications of the memory controller, the spare memory is set in unit of rank memory.
The logical memory capacity of single rank memory differs from that of dual rank memory when online spare memory
is specified.
 Single rank memory configuration
Logical memory capacity = (Physical memory capacity * Nb of DIMMs) – (Physical memory capacity)
 Dual rank memory configuration
Logical memory capacity = (Physical memory capacity * Nb of DIMMs) – (Physical memory capacity / 2)
The server supports the following product number.
 1 GB memory: Single rank
 2 GB/4 GB/8 GB memory: Dual rank