A SAN that has multiple switches between the nodes and the storage component
is an example of a complex storage solution. Because the cluster nodes do not require that the same path for any particular disk always be used, nodes may enumerate the disks by using different IDs. For example, node A may enumerate disk 1 as follows:
LUN 1 TID 1
However, because node B can be connected to a separate switch and to a separate controller in the SAN and still enumerate the same disk, the disk may be enumerated as follows:
LUN 2 TID 3
You may also receive the error that is mentioned in the "Symptoms" section if you use multi-pathing software. You may receive the error message when the multi-pathing software runs an analysis phase where the request could go down one path. Next, the multi-pathing software runs a commit phase where the request could go down another path. Because the first "Bus / Port / TID / LUN" query and the second "Bus / Port / TID / LUN" query do not match, you may receive the error message that is mentioned in the "Symptoms" section.