Uniquely identifying disks in OpenEBS on VMWare platform

A little bit of background. I work at a company called MayaData (www.mayadata.io) who develops a very cool Open Source software called OpenEBS (CNCF Sandbox project) that simplifies the deployment of stateful applications on Kubernetes. You should check it out at www.openebs.io.

Kubernetes can be installed on any type of machine; be it a Virtual Machine, bare metal, or cloud machine. Kubernetes abstracts away most of the significant bits of a system, except storage. When it comes to storage, the main reason an abstraction will not work is that there is no uniqueness among the storage devices themselves. Every vendor and every virtualization platform implements it differently.

Kubernetes and VMWare

We hit this issue of unique virtual disks while deploying OpenEBS on Kubernetes backed by VMware VMS or other virtualization platforms because OpenEBS NDM is not able to uniquely identify the block devices themselves.

Changing the absolute configuration on the Virtual Machine can help you get around this issue.

Here are the steps to enable unique disk IDs in VMware via vSphere client:

  1. Right-click the virtual machine for which you want to enable the disk UUID attribute, and select Power > Power Off.
  2. The virtual machine powers off.
  3. Right-click the virtual machine, and click Edit Settings.
  4. Click the Options tab, and select the General entry in the settings column.
  5. Click Configuration Parameters. The Configuration Parameters window appears.
  6. Click Add Row.
  7. In the Name column, enter disk. Enable UUID.
  8. In the Value column, enter TRUE.
  9. Click OK and click Save.
  10. Power on the virtual machine.

This will assign WWN to each disk in the Virtual Machine. 

That is it for today's tutorial. If you have any questions, feedback, or any topic that you feel I should cover next, feel free to comment on our blog or reach out to us on our Slack channel.

Prateek Pandey
Software Engineer at MayaData
Murat Karslioglu
VP @OpenEBS & @MayaData_Inc. Murat Karslioglu is a serial entrepreneur, technologist, and startup advisor with over 15 years of experience in storage, distributed systems, and enterprise hardware development. Prior to joining MayaData, Murat worked at Hewlett Packard Enterprise / 3PAR Storage in various advanced development projects including storage file stack performance optimization and the storage management stack for HPE’s Hyper-converged solution. Before joining HPE, Murat led virtualization and OpenStack integration projects within the Nexenta CTO Office. Murat holds a Bachelor’s Degree in Industrial Engineering from the Sakarya University, Turkey, as well as a number of IT certifications. When he is not in his lab, he loves to travel, advise startups, and spend time with his family. Lives to innovate! Opinions my own!
Evan Powell
Founding CEO of a few companies including StackStorm (BRCD) and Nexenta — and CEO & Chairman of OpenEBS/MayaData. ML and DevOps and Python, oh my!