When attaching data disks to an Azure Linux VM for an SAP workload, a stable naming convention is required for automation, as device names like /dev/sdc can change upon reboot. Azure provides a set of stable symbolic links under the /dev/disk/azure/ directory. Specifically, data disks are organized by SCSI controller and LUN. The path /dev/disk/azure/scsi1/ contains symbolic links named lun0, lun1, lun2, etc., which correspond directly to the LUN specified in the ARM template. Running the ls /dev/disk/azure/scsi1 command lists these links, allowing a direct correlation between the LUN and the underlying kernel device name (e.g., sdc), which is the goal of the question.

A. ls /dev/disk/azure/root: This path is a symbolic link to the operating system (OS) disk, not the attached data disks.

C. tree /dev/disk/azure/root: This command also targets the OS disk path. It is used for viewing a directory tree, which is not the intended use for this specific path.

D. tree /dev/disk/azure/resource: This path is a symbolic link to the temporary resource disk, not the persistent data disks used for SAP files.

1. Microsoft Learn

"Configure LVM on a Linux VM in Azure": This document demonstrates using the /dev/disk/azure/scsi1/ path to identify disks by their LUN. Under the "Identify the data disks" section

it shows the command ls -l /dev/disk/azure/scsi1/ and its output

which clearly maps lun0

lun1

etc.

to their corresponding /dev/sd device names.

2. Microsoft Learn

"Azure Virtual Machines storage configuration for SAP NetWeaver": In the "Linux" section

this guide states

"On Linux

the Azure platform creates friendly names in the directory /dev/disk/azure. For your automation scripts

use the devices in the /dev/disk/azure directory." This confirms the recommended practice for SAP workloads is to use this stable path for disk identification.

3. Microsoft Learn

"Troubleshoot Linux VM device name changes": This article explains the problem of non-persistent device names and recommends using persistent naming conventions. It mentions that the Azure Linux Agent creates symbolic links under /dev/disk/azure based on the SCSI address (including LUN) of the disks

reinforcing the reliability of this path for correlation.