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/disk/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 8 (lsscsi --scsi_id command)
  • 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)

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content