Two new servers are purchased and need to be installed to allow sharing of a single external hard drive enclosure. 
One server is configured as a local file server， and the other as a database server for a different network.  The onsite technician notices that when both servers are running at the same time， they each receive SCSI errors. When they are running individually， no errors are reported.  
Which of the following is the BEST source of information to use for troubleshooting this problem？（）

A. the server vendor’s FAQ website
B. the SCSI controller vendor’s user manual
C. the drive enclosure vendor’s user manual
D. the network operating system vendor’s website