How are SCSI ID generated ?

Solution Unverified - Updated -

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

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