understanding H:BT:L in /dev/disk/by-path

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I would like to understand the output of ls -l /dev/disk/by-path and identify
Host:Bust:Target:LUN numbers in it.

We have Fiber Channels connected to SAN Storage. The following is the sample output of the command:

The first line corresponds to local server disk and the second one corresponds to SAN Storage

pci-0000:03:00.0-scsi-0:2:0:0 -> ../../sda
pci-0000:04:00.0-fc-0x500601610860608e-lun-4 -> ../../sdf

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SM Guru 3731 points
11 December 2017 7:32 AM

You may use "lsscsi" command which would list out block devices along with "H:C:T:L" info which is a good one. The first column of output shows "H:C:T:L" information as shown below:

[root@host1 ~]# lsscsi
[0:0:0:0]    disk    VMware,  VMware Virtual S 1.0   /dev/sda
[0:0:1:0]    disk    VMware,  VMware Virtual S 1.0   /dev/sdb

A lot of options available with this command as one such is using "--device" which would also prints out device minor & major numbers:

[root@host1 ~]# lsscsi --device
[0:0:0:0]    disk    VMware,  VMware Virtual S 1.0   /dev/sda [8:0]
[0:0:1:0]    disk    VMware,  VMware Virtual S 1.0   /dev/sdb [8:16]

Check out the man page of this command to find out more details.

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