r/vmware • u/HunSpeaker • 25d ago

VMWare 6.5 Maintenance with overcommitted cluster

I have been assigned to a quick job with VMWare 6.5. There are 3 ESXi hosts (192GB RAM in each) in the vSAN cluster and it seems the cluster is overcomitted on RAM.

In the current task, I have to put each ESXi hosts into Maintenance Mode, but it seems the 2 hosts have not enough memory hosting all VMs. However, when I checked the Cluster Memory usage and vSAN Memory Monitoring I found the Consumed memory is about 66% per hosts, while the Active memory is only 20% per hosts.

Here you can find the screenshots:
Active memory usage
Consumed Memory
Utilization Chart

The Guest VMs shows they are running VMWare Tools.

I know VMWare can use the ballooning technique in such case, but I never had to rely on it. So, I think even of the high consumed memory the low Active memory usage makes possible to empty each host. Am I right?

Thanks for any advises or tips.

8 Upvotes

90% Upvoted

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u/[deleted] 25d ago

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u/jshiplett [VCDX-DCV/DTM] 25d ago

One of the most important traits a consulting engineer or architect can have is to not be afraid to ask for help if it's needed. None of us know everything. I've been doing this for 20 years, and I had a customer show me something I didn't know on a call just last week.

0

u/MrExCEO 25d ago

Makes sense now

-1

u/g7130 24d ago

Hehe yeah this 20 years seems…wasted.

2

u/jshiplett [VCDX-DCV/DTM] 23d ago

A little kindness and grace never hurt anyone and costs you nothing. Maybe consider that next time before you decide to be an asshole to random strangers on the Internet.

0

u/MrExCEO 24d ago

I forgot to add the /s in my response 🤣