IBM x3690 X5 Service Manual page 305

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This configuration consists of two 8x1.8-inch drive backplanes and requires four
SAS signal cables. You can also install the optional simple-swap 2.5-inch SATA
drive kit in this configuration.
The following illustrations show the supported combination of drive backplane
configurations that you can use to support 20 drives:
This configuration consists of three 4x2.5-inch drive backplanes and one
8x1.8-inch drive backplane and requires five SAS signal cables.
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This configuration consists of one 8x2.5-inch drive backplane, one 4x2.5-inch
drive backplane, and one 8x1.8-inch drive backplane and requires five SAS
signal cables.
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This configuration consists of one 4x2.5-inch drive backplane and two
8x1.8-inch drive backplanes and requires five SAS signal cables.
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Chapter 5. Removing and replacing components
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