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Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Appendix C RAID Controller Considerations
RAID Controller Cabling
Example 2—Two Nonexpanders and Two RAID Controllers with 16 Drives
Figure C-2 shows an example of a server that is using two RAID controllers in PCIe slots 3 and 5 and
two nonexpander transition cards to control eight drives in each of the two modular drive bays.
Four RAID cables are required (2 x UCSC-CABLE-L and 2 x UCSC-CABLE-S).
• The upper blue line is a 0.8m cable (UCSC-CABLE-S) from the slot 5 RAID controller SAS 0
connector to the nonexpander connector for PORT 1–4.
• The upper red line is a 1m cable (UCSC-CABLE-L) from the slot 5 RAID controller SAS 1
connector to the nonexpander connector for PORT 5–8.
• The violet line is a 1m cable (UCSC-CABLE-L) from the slot 3 RAID controller SAS 0 connector
to the nonexpander connector for PORT 1–4.
• The lower blue line is a 0.8m cable (UCSC-CABLE-S) from the slot 3 RAID controller SAS 1
connector to the nonexpander connector for PORT 5–8.
• The green lines are the cables from the two RAID controllers to their respective SCPM backup units.
Figure C-2 RAID Controller Cabling Guidelines, Two Nonexpanders and Two Controllers
1 Transition cards, nonexpander version
(shown with fan tray removed)
3 RAID controller cards in PCIe slots 3 and 5
2 SCPM backup units
(two, mounted to trays on air baffle)
1 2
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