IBM x3850 X5, Руководство по внедрению

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150
IBM eX5 Implementation Guide
listed in “Workload-optimized x3690 X5 models” on page 125. You can add two more eXFlash
backplanes to increase the supported number of SSDs to 24.
The IBM eXFlash 8x 1.8-inch HS SAS SSD Backplane, part number 60Y0360, supports eight
1.8-inch High IOPS SSDs, as shown in Table 4-23. The eight drive bays require the same
physical space as four SAS hard disk bays. A single eXFlash backplane requires two SAS x4
input cables and one custom power/configuration cable (shipped standard). Up to four SSD
backplanes and 24 SSDs are supported in the x3690 X5 chassis.
For more information regarding eXFlash and SSD information, including a brief overview of
the benefits from using eXFlash, see 2.8, “IBM eXFlash” on page 47.
Table 4-23 x3690 X5 hard drive backplanes
Figure 4-23 shows the 8x 1.8-inch SSD backplane with its two SAS connectors.
Figure 4-23 8x 1.8-inch SSD backplane (rear view)
Table 4-24 lists the supported 1.8-inch SSDs.
Table 4-24 x3690 X5 hard drive options
The failure rate of SSDs is low because, in part, the drives have no moving parts. The 50 GB
High IOPS SSD is a Single Level Cell (SLC) device with Enterprise Wear Leveling. As a
consequence of both of these technologies, the additional layer of protection provided by a
RAID controller might not always be necessary in every client environment. In certain cases,
RAID-0 might even be an acceptable option.
Table 4-25 on page 151 lists the controllers that support SSDs.
Part
number Feature
code Backplane Drives supported SAS cables
included
60Y0360 9281 IBM eXFlash 8x 1.8” HS SAS SSD Backplane Eight 1.8” solid-state drives 2 short, 2 long
Part number Feature code Description Backplane used
43W7735 5314 IBM 50GB SATA 1.8-inch NHS SSD 8x eXFlash SSD