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In /var/log/messages, I find the following log:

Oct 23 21:48:53 localhost kernel: sd 3:0:0:0: timing out command, waited 180s

Please explain the values that are separated by colons.

Also where does 180s come from? Is this user definable?

Also how do you know which SCSI command timed out?

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(thanks to @dirkt for the answer)

The 3:0:0:0 is the SCSI Address. See http://www.tldp.org/HOWTO/SCSI-2.4-HOWTO/scsiaddr.html.

Also see command 'lsscsi'. It lists each SCSI device in the system, and its corresponding SCSI address. So you can match up the error log with the SCSI device.

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    If you don't happen to have the lsscsi command installed, lsblk -o +HCTL will achieve the same thing. (HCTL refers to Host-adapter, Channel, Target, LUN: the four digits separated by the colons).
    – telcoM
    Dec 13, 2021 at 4:52

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