NEC EXP804, User Manual

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1. Installing Internal Optional Devices
Express5800/R120h-1M User’s Guide
80
Chapter 2 Preparations
(2) Memory Sparing Function
By making a rank of DIMM stored in the memory channel under a memory controller of each CPU stand by
as a spare, Memory Sparing Function makes processing continue by making the DIMM standing by perform
the task automatically in case a correctable error occurs in a DIMM under the memory channel in operation.
Tips From the operating system, a size smaller than that is really installed is recognized
(it changes depending on the number of DIMM installed and the capacity per one).
For the physical memory capacity available from the operating system, refer to the table below.
The
number of
CPU
The number
of memory
Types of on-board memory
8GB
(SR)
8GB
(DR)
16GB
(SR)
16GB
(DR)
32GB
(DR)
64GB
(QR)
128GB
(OR)
1 8 32GB 48GB 64GB 96GB 192GB 448GB 768GB
12 48GB 72GB 96GB 144GB 288GB 672GB 1152GB
2 16 64GB 96GB 128GB 192GB 384GB 896GB 1536GB
24 96GB 144GB 192GB 288GB 576GB 1344GB 2304GB
The followings are the conditions to use this function.
Memory Controller 1 Memory Controller 2
Memory Controller 1
Spare Set Spare Set Spare Set Spare Set Spare Set Spare Set
Spare Set Spare Set Spare Set Spare Set Spare Set Spare Set
Memory Controller 2