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Understanding VMware ESXi Queuing and the Flasharray

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Understanding VMware ESXi Queuing and the Flasharray
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So I am in the middle of updating my best practices guide for vSphere on FlashArray and one of the topics I am looking into providing better guidance around is ESXi queue management. This breaks down to a few things:

  • Array volume queue depth limit
  • Datastore queue depth limit
  • Virtual Machine vSCSI Adapter queue depth limit
  • Virtual Disk queue depth limit

I have had more than a few questions lately about handling this–either just general queries or performance escalations. And generally from what I have found it comes down to fundamental understanding of how ESXi queuing works. And how the FlashArray plays with it. So I put a blog post together of a use case and walking through solving a performance problem. Explaining concepts along the way.

Please note:

  • This is a simple example to explain how queuing works in ESXi
  • Mileage will vary depending on your workload and configuration
  • This workload is targeted specifically to make relationships easier to understand
  • PLEASE do not make changes in your environment at least until you read my conclusion at the end. And frankly not without direct guidance from VMware support.

I am sorry, this is a long one. But hopefully informative!

One thing to note here, this is one virtual machine running workload to a virtual disk on one VMFS. So nothing is interfering, so while this is not realistic, I think it is still valuable to explain how these things work. So here is the screenshot:

Read the entire article here, Understanding VMware ESXi Queuing and the Flasharray

Via the fine folks at opvizor.

Categories:
opvizor opvizor is SaaS company that specializes in solutions for virtualization and cloud computing. These solutions help businesses automate and manage their virtual IT infrastructures within heterogeneous data processing centers, as well as solutions for the prevention of errors and failures. opvizor’s offices are located in Vienna, Austria and Houston, TX, USA. Dennis Zimmer is founder and CEO of the opvizor group.

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