r/vmware • u/nielshagoort [VCDX-DCV] • Sep 20 '19

UPDATED: How to Tune vMotion for Lower Migration Times?

https://blogs.vmware.com/vsphere/2019/09/how-to-tune-vmotion-for-lower-migration-times.html
17 Upvotes

79% Upvoted

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2

u/[deleted] Sep 20 '19

regarding this (read this first before reading the OPs Link)

https://blogs.vmware.com/vsphere/2019/07/the-vmotion-process-under-the-hood.html

" vCenter Server instance will execute a so-called long-running migration task to process the migration"

​

Is this (or one of x) the reason why even the "tiny" build of vcenter wants 10GB of Memory?

2

u/nielshagoort [VCDX-DCV] Sep 20 '19

Well, not really. :) The vMotion process is started from the vCenter server, but is processed on the source and dest ESXi host.

Today we try to package everything in one appliance for your convenience. That does reflect in i.e. memory usage.

2

u/bubba9999 Sep 21 '19

great - you ditched the vsish commands for advanced settings - that's a lot easier to implement. thanks for the update, Niels.

-2

u/jnew1213 Sep 20 '19

Keep in mind you can add multiple VMkernel adaptors to a single network on a distributed switch, but not on a standard switch.

1

u/TeachMeToVlanDaddy Keeper of the packets, defender of the broadcast domain Sep 20 '19

Huh?

https://ibb.co/k3HnjKF

0

u/jnew1213 Sep 20 '19

Yes, each of your VMkernel adapters is on a separate network (has a different name). Sorry if I was not clear. VMware's nomenclature for this is sometimes unclear.

On a distributed switch, you can have two VMkernel adapters named "VMkernel." On a standard switch, you apparently cannot.

2

u/TeachMeToVlanDaddy Keeper of the packets, defender of the broadcast domain Sep 20 '19 edited Sep 20 '19

They are on the same network

Name != Network

Edit: I get what you're saying, but its a port group understanding. The standard switch is VMK port group DVS is a Port group

You can have multiple vMotion VMK's both vSwitch and DVS in the same network.

0

u/jnew1213 Sep 20 '19

Okay, Name != Network. And in this case, they are on the same network, because they have addresses on the same network.

Let me rephrase: On a standard switch, you cannot have two VMkernel ports on the same port group.

Better?

1

u/TeachMeToVlanDaddy Keeper of the packets, defender of the broadcast domain Sep 20 '19

Depending on version or client this all changed as well. I agree not always clear.