Exploring VSAN APIs Part 4 – VSAN Disk Mappings

A useful feature that is provided in the vSphere Web Client for VSAN is the ability to visualize the VSAN disk mappings for each ESXi host contributing to the VSAN cluster. This information will come in handy for troubleshooting as well as checking or servicing a disk failure.

You can easily retrieve the VSAN Disk Groups for each ESXi host and their respective SSD and HDD within that disk group by looking at the following property vsanSystem->config->storageInfo->diskMapping. There is a variety of information for each device such as the name, capacity, state, health, etc. of each disk. To demonstrate the above operation, I have created a vSphere SDK for Perl sample script called vsanHostTrafficTypeMgmt.pl

Disclaimer: These scripts are provided for informational and educational purposes only. It should be thoroughly tested before attempting to use in a production environment.

To show the disk mappings, you will need to specify a vSphere Cluster running VSAN using the following command:

./vsanHostDiskMapping.pl --server vcenter55-1.primp-industries.co --username root --cluster VSAN-Cluster

In the above output, you will see the VSAN Disk Groups for each ESXi host along with their respective device name and capacity. Here is another screenshot for a VSAN environment that contains multiple VSAN Disk Groups:

This is just a very tiny sub-set of the available properties for a disk, for more information take a look at the scsiLun definition within the vSphere API Reference.

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