hanging at startup after SAN work

After our SAN technicians replaced some equipment, a number of servers are hanging at startup.  

But if I unplug the fiber connection and restart the server, everything starts up normally.  If I plug the fiber in while the machine is on, the server will hang-up intermittently.

What direction do I need to point technicians to in order to get this resolved?  e.g, configuration files, port speed etc.
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exx1976Connect With a Mentor Commented:
Yes, sounds to me like a zoning issue, possibly a misconfigured fibre loop..
It would help to know the HBA and SAN manufacturer..   But, my first guess is that some change was made with LUN masking/zoning..  I'm guessing the server hangs at startup while it's scanning the FC loop, yes?
Marketing_InsistsAuthor Commented:
switch is a brocade 4900 and the SAN is a HP XP10000, HBA cards are Qlogic qla2300's.

The only servers having the problem are those that have more than one SAN connection; to the repaired switch and to a additional switch.

For example, Brocade B had a mainboard replaced on it.  Any servers connected solely to Brocade B are fine.  But if a server has connections to both Brocade B and Brocade A or Brocade B and Brocade C, we have these hangups

Marketing_InsistsAuthor Commented:
To rephrase, any server that is hooked up to Brocade-B (repaired) alone is fine.  If a server is hooked up to Brocade-B PLUS any additional Brocade, these issues crop up.
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