My Top Picks for Sessions at VMworld 2021

VMworld is virtual for the second straight year. The event is October 5-7 and will have content around the clock to accommodate various time zones. There are two types of passes available; the general pass is free and the Tech+ Pass has a charge. Some of the sessions are only available with the Tech+ Pass. The content catalog has been released so it’s nice to get an idea of what’s happening to plan ahead. I like to focus mostly on sessions that will help me add value to the work I do today. Some sessions will be pre-recorded and some will be live via Zoom. As always, there’s a lot of sessions to choose from. I went through them all and below are my top picks.

Deep Dive: VM Performance and Best Practices [VI2158]$
Extreme Performance Series: Performance Best Practices [MCL1635]
Extreme Performance Series: vSphere Advanced Performance Boot Camp [MCL2033]$
It’s good to see sessions based on the fundamentals of vSphere and then taking those fundamentals to the next level. All three sessions sound similar and rated at the highest technical level. Both extreme performance sessions are hosted by Mark Achtemichuk and Valentin Bondzio, and one of them is free. Mark is a VCDX, and whenever a VCDX speaks, I pay attention. These sessions should deliver useful information for all VMware admins. Mark and Valentin both work for VMware so I am sure they have seen a million different problems and can help people better troubleshoot when they face these problems.

Core Storage Best Practices Deep Dive [MCL2071]$
VMware vSAN – Dynamic Volumes for Traditional and Modern Applications [MCL1084]
VMware Storage Queue Tuning [VMTN2862]
The first session I listed above will be hosted by Cody Hosterman and Jason Massae. I have watched Cody present before at a local VMUG and other events, and he always delivers. He works for Pure, but don’t let that fool you into thinking he’s there to only promote his product. He always gets to the crux of storage that applies to nearly everyone. Duncan Epping, VCDX, and Cormac Hogan are presenting the vSAN session. They will be discussing the newer vSAN File Service and more cutting edge integration with vSphere Container Storage Interface. I am very interested in what storage tips all of these rock stars will give that I can apply at my job.

The Clock is Ticking on NSX Data Center for vSphere [EDG2721]$
NSX Data Center for vSphere to NST-T Data Center – Migration Approaches [NET1211]
NSX Data Center for vSphere to NSX-T: Strategies to Make the Move [EDG1515]
NSX-V reaches end of support on January 16th, 2022 and that’s the basis of these panels. Jayson Block, VCDX, is hosting the third session linked above. If you are still using NSX-V, you have to attend at least one of these sessions. All three sessions will give good advice on developing a migration plan. Hopefully, this will help to jumpstart your planning and migrating to NSX-T before support ends.

A Field Guide to Health Check vSAN to Operate, Upgrade and Transform [MCL1825]$
A technical Review of PSC. VMDIR, Replication and Snapshots [VI2447]$
Troubleshooting with vRealize Operations and vRealize Log Insight [MCL1286]$
All three of these sessions are in the meet the expert category and will give deep dives in their respective areas. Paul McSharry, VCDX, is presenting the vSAN session. This session looks valuable for anyone using vSAN to hear from an architect that has many deployments under their belt. The PSC has come a long way, but I still feel I don’t know everything I need to know about it. I always come across some sort of problem that support needs to help with. The PSC session looks to give the deeper understanding that I have been looking for. A lot of companies have vROps and vRLI deployed, but I rarely see anyone use the two products to their full potential. Using one or both of these products together is very useful for troubleshooting. I am looking forward to fine tuning my troubleshooting skills with this session.

Solid sessions make a virtual event and VMworld delivers again. I rather it be in person. However, it being virtual has some benefits, such as there’s a free option and more accessible to a wider audience. I will be again missing out on collecting a suitcase full of swag, but there will be giveaways from VMware and vendors, even during a virtual event. I won an official VMworld backpack last year!

Inaccurate Statistic in vSphere Flash Client

I mostly use the vSphere Flash client and was monitoring my vSAN performance with it. I noticed TCP inbound loss rate was ranging from 1-10% on the vSAN host TCP packet retransmission and loss rate graph. My VMs did not seem to be impacted. Also, there is bound to be some loss with TCP. However, this number seemed high to me.

I had a case open with VMware GSS and they could not figure out what was the underlining issue. They blamed my Cisco UCS servers. Cisco didn’t have any ideas. Nothing seemed wrong with my physical switches.

Then one day I used the HTML5 client and looked at the same graph. The numbers were much lower. I went back to the Flash client and the numbers were high. I followed the graphs over multiple time periods, on every host, and noticed the numbers were always off by a factor of ten. See the two screenshots below. You can see the flow of the line graph is the same, but with the y axis on a different scale. Also, every exact time I hover over is always off by a factor of ten.

I have a cluster on VMware Cloud on AWS. That of course is using vSAN so I decided to check it out. Same exact problem! Therefore, it has nothing to do with my on-prem configuration or version. I reported the issue to VMware and didn’t seem like they will do anything about it. After all, the Flash client will be deprecated in the next major release of vSphere. Though, still frustrating that I chased what I thought was a problem for a while and it turned out to be a bug with the graph. I hope no one else falls for this too.

Flash Client (Flex)
Flash_vSAN_TCP

HTML5 Client
HTML5_vSAN_TCP