ESXi and the Missing LUNs: 256 or Higher

A customer pinged me the other day and said they could not see a volume on their ESXi host. Running ESXi version 6.5. All of the normal stuff checked out, but the volume was nowhere to be seen. What gives? Well it turned out to be the LUN ID was over 255 and ESXi couldn’t see it. Let me explain.

The TLDR is ESXi does not support LUN IDs above 255 for your average device.

*It’s not actually aliens, it is perfectly normal SCSI you silly man.

Continue reading ESXi and the Missing LUNs: 256 or Higher

Unattended VMFS UNMAP Script

I updated my UNMAP PowerCLI script a month or so ago and improved quite a few things–but I did remove hard-coded variables and replaced it with interactive input. Which is fine for some, but for many it was not.

Note: Move to VMFS-6 in vSphere 6.5 and you don’t have to worry about this UNMAP business anymore 🙂

Essentially, quite a few people want to run it as a scheduled task in Windows, and if it requires input that just isn’t going to work out of the box. So I have created an unattended version of the script. For details read on.

Note: I will continue to update the script (bugs, features, etc.) but will note them on my other blog post about the script here:

Pure Storage FlashArray UNMAP PowerCLI Script for VMware ESXi

I will only update this post if the unattended version changes in a way that makes these instructions wrong. Continue reading Unattended VMFS UNMAP Script

Importing a VVol Snapshot with PowerCLI

This is all very exciting for me, finally able to really start blogging about VVols in earnest. As you may or may not be aware we (Pure Storage) currently have our VVol implementation in beta. So I can finally start digging into some VVol work. Not going to get into implementation details just yet, but instead a quick walkthrough of importing a VVol snapshot with PowerCLI.

First, enjoy a poorly photoshopped Back To the Future reference:

Continue reading Importing a VVol Snapshot with PowerCLI

Multi-site FlashArray Configuration with Site Recovery Manager

The FlashArray Storage Replication Adapter for VMware Site Recovery Manager supports many:many replication since the 2.0 release of the SRA. Use of test failover, failover and reprotect is no different than with 1:1, and nor is the setup of the volumes. The only real difference is how you configure the array managers in SRM. So let’s review how this is done.

Continue reading Multi-site FlashArray Configuration with Site Recovery Manager

Hiring! Looking for a Virtualization/Automation focused Solutions Architect

Hey all! We have a new position that has opened up at Pure Storage for a Solutions Architect that will be focused on virtualization and automation. Apply here:

https://boards.greenhouse.io/purestorage/jobs/651394

So that is the job posting, but let me talk in more detail about what it entails.

Continue reading Hiring! Looking for a Virtualization/Automation focused Solutions Architect

Check out and Vote for Pure Storage VMworld 2017 Sessions

Another year, another VMworld! This year I have a few sessions that I have submitted that I would love to do this year, hopefully you agree and will vote for them. Plus some other sessions related to Pure Storage that you should take a look at.

Continue reading Check out and Vote for Pure Storage VMworld 2017 Sessions

Documentation Update, Best Practices and vRealize

So a few updates. I just updated my vSphere Best Practices guide and it can be found here:

Download Best Practices Guide PDF

I normally do not create a blog post about updating the guide, but this one was a major overhaul and I think is worth mentioning. Furthermore, there are a few documents I have written and published that I want to mention.

  1. FlashArray Plugin for vRealize Orchestrator User Guide
  2. Implementing FlashArray in a vRealize Private Cloud

Continue reading Documentation Update, Best Practices and vRealize

In-Guest UNMAP Fix in ESXi 6.5 Part II: Linux

This is the second part of this post. In the first post, I explained the fix and how it affected Windows. In this post, we will overview how the change affects Linux-based virtual machines. See the original post here:

In-Guest UNMAP Fix in ESXi 6.5 Part I: Windows

I posted about In-Guest UNMAP with Linux VMs in this post:

What’s new in ESXi 6.5 Storage Part I: UNMAP

One thing you can note is that automatic UNMAP works quite well, but manual UNMAP, like fstrim did not. So let’s revisit fstrim now that this patch is out. Continue reading In-Guest UNMAP Fix in ESXi 6.5 Part II: Linux

In-Guest UNMAP Fix in ESXi 6.5 Part I: Windows

As you might’ve seen, Cormac Hogan just posted about an UNMAP fix that was just released. This is a fix I have been eagerly awaiting for some time, so I am very happy to see it released. And thankfully it does not disappoint.

First off, some official information:

Release notes:

https://kb.vmware.com/kb/2148989

Manual patch download:

https://my.vmware.com/group/vmware/patch#search

Or you can run esxcli if you ESXi host has internet access to download and install automatically:

esxcli software profile update -p ESXi-6.5.0-20170304001-standard -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml

Continue reading In-Guest UNMAP Fix in ESXi 6.5 Part I: Windows

Understanding VMware ESXi Queuing and the FlashArray

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!
Continue reading Understanding VMware ESXi Queuing and the FlashArray

"Remember kids, the only difference between Science and screwing around is writing it down"

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