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How are SCSI ID generated ?

Solution Unverified - Updated 2017-02-15T17:56:33+00:00 -

Issue

How are scsi_id identifiers generated, such as 360060e80000000000000000000000000 as seen in multipath and within /dev by-id?
Why is there a '3' prefixing the WWID of a device?
storage displays a wwid for a device, but the kernel scsi id is slightly different, why?
the displayed scsi id within multipath for different storage are different lengths, why?
what is the difference between a WWID and a scsi_id?
is there any difference between a WWID and a scsi_id?

Environment

Red Hat Enterprise Linux 5 (scsi_id)
Red Hat Enterprise Linux 6 (scsi_id)
Red Hat Enterprise Linux 7 (lsscsi --scsi_id)

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