Q: How do I install the HP SAS Expander and what are the power requirements?
A: The card needs an x4 PCIe slot on a motherboard and draws 11 watts of power. The card doesn't require software drivers, it is invisible to the operating system and motherboard. A common dilemma is people wishing to use this card in an empty chassis like a Norco RPC-4220 as a "drive cage". Some people have resorted to using an old motherboard, or buying a low-cost Intel Atom based motherboard to serve as an ON/OFF switch for the chassis and to power the card - this solution is still far cheaper than buying a prefab expander chassis. Unfortunately this card has no external 4-pin Molex power connector like the Chenbro expanders, but it's a fair tradeoff given Chenbro expanders aren't really available anymore, and the HP expander uses a newer SAS2/SATA3 expander chip (support 6Gbps operation), whereas the Chenbro expanders are SAS/SATA2 (3Gbps).
Q: How do I connect harddisks to the HP SAS Expander?
A: There are 9 ports total which can connect four harddisks each. The external SFF-8088 port is Port #1. The internal SFF-8087 are Port #2 through Port #9. I recommend populating drives beginning with internal Port #2. To uplink the expander to your RAID/HBA, connect to Port #8 on the expander with an SFF-8087 cable from your RAID/HBA. If your RAID/HBA has an external SFF-8088 connector, connect to Port #1 on the expander with an external SFF-8088 cable.
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