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How can I list scsi device ids under Linux?

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  • 3
    Please take my previous comment about how to ask good questions seriously! Drop the "hi" and "thanks", make sure the first few lines or the question introduce the question instead of being meta data so that the home page summaries are useful, and always show what attempts you have made to solve problems yourself. I answered this question by copy and pasting a bit of it into google and copy and pasting a bit from the result summaries back to you (after checking it in my terminal).
    – Caleb
    Jun 17, 2011 at 11:04
  • SCSI ID is not precisely defined thing, reference this discussion yarchive.net/comp/linux/scsi_ids.html
    – catpnosis
    Jan 30, 2016 at 17:55

3 Answers 3

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I don't have /proc/scsi/scsi on my system with 2.6.39.1 kernel. I would use 'lsscsi' command:

~> lsscsi -v
[0:0:0:0]    disk    ATA      ST3500418AS      CC38  /dev/sda
  dir: /sys/bus/scsi/devices/0:0:0:0  [/sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0]
[1:0:0:0]    disk    ATA      WDC WD2500KS-00M 02.0  /dev/sdb
  dir: /sys/bus/scsi/devices/1:0:0:0  [/sys/devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0]
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  • 2.6.38.6 here and I do have it. I wonder if there is a kernel config option for providing that interface. The reference I found to using that proc entry was as old as the hills. Also my distro doesn't have lsscsi by default although I see there is an optional package for it.
    – Caleb
    Jun 17, 2011 at 19:01
  • 8
    To add, modern lsblk -S can show HOST:CHANNEL:TARGET:LUN numbers too.
    – catpnosis
    Jan 30, 2016 at 17:46
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cat /proc/scsi/scsi
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    This does not show which SCSI ids correspond to which system devices.
    – catpnosis
    Jan 30, 2016 at 17:04
  • Also it doesn't exist any more. Oct 22, 2021 at 12:58
  • @MatthiasUrlichs does exist for me on 5.18.6-zen1-1-zen. Perhaps you kernel has some setting disabled that creates that dir.
    – Hi-Angel
    Jul 20, 2022 at 8:42
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You can use the links in /dev/disk/by-id:

[root@krxl02cn05 by-id]# pwd
/dev/disk/by-id

[root@krxl02cn05 by-id]# ls -rtl
total 0
lrwxrwxrwx 1 root root  9 Feb 12 01:40 scsi-3600605b005d8655019aa31faf0812bae -> ../../sda
lrwxrwxrwx 1 root root 10 Feb 12 01:40 scsi-3600605b005d8655019aa31faf0812bae-part2 -> ../../sda2
lrwxrwxrwx 1 root root 10 Feb 12 01:40 scsi-3600605b005d8655019aa31faf0812bae-part1 -> ../../sda1
lrwxrwxrwx 1 root root  9 Feb 12 01:50 scsi-3600144f09a214698000054db88550008 -> ../../sdd
lrwxrwxrwx 1 root root  9 Feb 12 01:50 scsi-3600144f09a214698000054db88460007 -> ../../sdc
lrwxrwxrwx 1 root root  9 Feb 12 01:50 scsi-3600144f09a214698000054db88260006 -> ../../sdb
lrwxrwxrwx 1 root root 10 Feb 12 01:54 scsi-3600144f09a214698000054db88260006-part1 -> ../../sdb1
lrwxrwxrwx 1 root root 15 Feb 12 04:56 scsi-3600144f09a214698000054db88460007-part1 -> ../../asm-disk1
lrwxrwxrwx 1 root root 15 Feb 12 04:59 scsi-3600144f09a214698000054db88550008-part1 -> ../../asm-disk2

So, the scsi id of /dev/sdc is 3600144f09a214698000054db88460007

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    Incorrectly downvoted answer. by-id shows WWID which is valid SCSI identificator, even though by-id not necessarily shows all disks. Sometimes, /dev/disk/by-path can show SCSI Ids too. Example ls -l /dev/disk/by-path outputs pci-0000:00:07.1-scsi-1:0:0:0 -> ../../sr0. So, sr0 have SCSI Host:BUS:Target_ID:LUN 1:0:0:0. This is not SCSI disk, though.
    – catpnosis
    Jan 30, 2016 at 17:35
  • Actually, lsscsi --scsi_id shows scsi-* matching id from /dev/disk/by-id (if present).
    – catpnosis
    Jan 30, 2016 at 17:42

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