IBM System x3850 X5 Implementation Guide

144 IBM eX5 Implementation Guide
These options are configured by using the UEFI during the boot sequence.
4.8.8 Effect on performance of using mirroring or sparing
To understand the effect on performance of selecting various memory modes, we use a
system configured with X7560 processors and populated with sixty-four 4 GB quad-rank
DIMMs.
Figure 4-19 shows the peak system-level memory throughput for various memory modes
measured using an IBM-internal memory load generation tool. As shown, there is a 50%
decrease in peak memory throughput when going from a normal (non-mirrored) configuration
to a mirrored memory configuration.
Figure 4-19 Relative memory throughput by memory mode
62
50
100
Sparing
Mirroring
Normal
Relative Memory Throughput by Memory Mode
Relative Memory Throughput
0 20 40 60 80 100 120

IBM System x3850 X5 Specifications

General

Processor Cores	Up to 10 cores per processor
Chipset	Intel 7500
Hard Drive Interface	SAS/SATA
Processor	Intel Xeon E7-4800 series, Intel Xeon E7-8800 series
Memory Slots	64 DIMM slots
Storage	Up to 16 x 2.5" hot-swap SAS/SATA HDDs or SSDs
RAID Support	RAID 0, 1, 5, 6, 10
Network Interface	Integrated Gigabit Ethernet
Operating System Support	Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware vSphere
Form Factor	4U Rack