Unity Connection server MCS-7845-H2-ECS4 hard drives only half have power

I have 2 servers MCS-7845-H2-ECS4 which each have 8 hard drives. the 4 hard drives on the left are not powered up on either server. The last 4 hard drives all have green power lights. Is this normal operation? I thought I might have a failed controller in the first server and I ran over to check the other server, but its hard drives were exactly like the primary server. The server is running Unity Connection 7.1(5).
I checked them with the RTMT tool and I don't see any alerts about any failed hard drives or controllers. Please help                  

Hi there,
I believe everything is working as designed We don't
run those exact models but there is a reference here
about removing 4 HDD's (out of 8) here;
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6789/ps5745/ps6509/data_sheet_c78-491743.html
Cheers!
Rob
"Why do the best things always disappear " 
- The Band

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