OK, we'll wrap this up now. Many thanks to all who helped out.  Key things we've learnt are that the cable sequence does not matter so long as basic rules about 'in' & 'out' are observed along with not crossing over from 'A' to 'B'.  In the end it seems one of the SPs - SPB - has died so we are currently running on one leg, but can at least now get Navisphere to work and manage the system. It is 'long in the teeth' (5 years old) and out of support so time to be replaced I think.  Thanks again!  David
Hi  We've just moved offices and our 7 rack CX3-20 has been re-installed in the new building but the sequence of which cable goes in which fibre port for the 4Gb backplanes has been lost! Duh!  Currently the Windows 2008 server hosts can see the correct disk drives and read & write to them but whilst I can login to the SPs Navisphere just shows a 'fault' on each SP and does not show any LUNS, drives or disks.  So, silly question, but is there anyway to retroactively discover what fibre should plug into which disk array? The diagram we used for the removal obviously is wrong!  Thanks David
CX3-20 backplane cables out of sequence - office move jumbled them up!