Can't see all disks in MSA30 with MSA1500cs

[Eva Freer]

I"m installing a new SAN with MSA 1500cs (Active/Passive) connected to 2 MSA 30 disk trays each with 8 HP 300GB Ultra320 SCSI disks. When I run ACU from any of the 4 HP DL380 servers (Windows Server 2003 R2 32-bit Standard Edition) connected via HP StorageWorks 4/8 Base SAN Switch to the MSA 1500, only 7 of the 8 drives in each tray are listed. The drives are in bays 1-8 so I should have SCSI IDs 0-5 & 8-9, but in both trays the disk in bay 4 (SCSI ID 3) is not shown. Does anyone have any idea what the problem is and how to fix it?
TIA

[Haggisnneeps2]

Are your MSA30s single or dual bus? If theyre dual bus you can only see 7 disks per channel
If you only put 1 disk in at slot 4 does it get seen OK? I'd start adding a disk at a time to see when it stops seeing SCSI ID 3 which could indicate a SCSI ID conflict
Or try populating the last 8 bays instead of the first 8 or even completely fill 2 of your trays to see what happens.
Then go from there

[Eva Freer]

I have resolved the problem. The MSA30 has an RJ45 connector on the back that I thought was for a network connection so I had connected it (on both MSA 30s) to an Ethernet switch using a Cat 5 cable. When I noticed that the label "LCD only" was next to it and removed the cable then cycled power to the MSA 30s and MSA1500cs the problem disappeared and I could now see all disks in the correct locations.