Greetings! Please, tell me how should I connect FF2U12X35HSBP and RS2BL040? The latter has one SFF8087 connector while FF2U12X35HSBP panel has 3 connectors and it needs all of then to be connected to have all 12 HDDs online.
Seems you'll need to get an expander card like http://www.intel.com/p/en_US/support/highlights/server/rec-res2sv240 Intel® RAID Expander Card RES2SV240.
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