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Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
AppendixC RAID Controller Considerations
RAID Controller Cabling
Example 3—Two Expanders and One RAID Controller with Sixteen Drives
Figure C-3 shows an example of a server that is using one RAID controller in PCIe slot 3 and two
expander transition cards to control eight drives in each of the two modular drive bays.
Two RAID cables are required (2 x UCSC-CABLE-S).
•The upper blue line is a 0.8m cable (UCSC-CABLE-S) from the RAID controller SAS 0 connector
to the first expander connector A (for drives 1 through 8).
•The lower blue line is a 0.8m cable (UCSC-CABLE-S) from the RAID controller SAS 1 connector
to the second expander connector B (for drives 9 through 16).
•The green line is a cable from the RAID controller to the battery backup unit.
FigureC-3 RAID Controller Cabling Guidelines, Two Expanders and One Controller
1Expander transition cards
(shown with fan tray removed)
3RAID controller card in PCIe slot 3
2SCPM backup unit
(mounted to tray on air baffle)

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