Chapter 5. IBM BladeCenter HX5 203Mirroring or sparing effect on performanceTo understand the effect on performance of selecting various memory modes, we use asystem that is configured with X7560 processors and populated with sixty-four 4 GBquad-rank DIMMs.Figure 5-17 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 comparing a normal (non-mirrored) configurationto a mirrored memory configuration.Figure 5-17 Relative memory throughput by memory mode5.11 StorageThe storage system on the HX5 blade is based on the use of the SSD Expansion Card forIBM BladeCenter HX5, which contains an optional LSI 1064E SAS Controller and two1.8-inch micro SATA drive connectors. The SSD Expansion Card allows the attachment of two1.8-inch solid-state drives (SSDs). If two SSDs are installed, the HX5 supports RAID-0 orRAID-1 capability.Installation of the SSDs in the HX5 requires the SSD Expansion Card for IBM BladeCenterHX5. Only one SSD Expansion Card is needed for either one or two SSDs. Table 5-22 liststhe ordering details.Table 5-22 SSD Expansion Card for IBM BladeCenter HX5Figure 5-18 on page 204 shows the SSD Expansion Card.6250100SparingMirroringNormalRelative Memory Throughput by Memory ModeRelative Memory Throughput0 20 40 60 80 100 120Part number Feature code Description46M6908 5765 SSD Expansion Card for IBM BladeCenter HX5
