Subscribe: Comments on: Guest blog entry: VMotion performance
Preview: Comments on: Guest blog entry: VMotion performance

Comments on: Guest blog entry: VMotion performance

Last Build Date: Mon, 04 Dec 2017 07:10:03 +0000


By: Increasing simulataneous vMotion migrations in vCenter 2.5 | Virtual World

Tue, 19 Mar 2013 09:20:46 +0000

[...] a maximum of 8 migrations as well by setting the value to 24. More information can be found at URL Share this:TwitterFacebookLike this:Like Loading... Bookmark the [...]

By: Tayfun DEGER

Sun, 24 Feb 2013 23:12:10 +0000

Thanks for sharing.

By: headache – VMware Concurrent svMotions Per Datastore Limit | IT headaches

Thu, 26 Jul 2012 08:48:05 +0000

[...] currently when you enter maintenance mode on a datastore, the vcenter will initiate i think 8 svmotions (storage vmotions) which takes quite a toll on our SAN. I’ve been following this thread: which pointed me to this blog entry: [...]

By: Ravi

Sat, 27 Aug 2011 23:57:48 +0000

With 10G, i have moved six large VMs (each 8GB active memory) which are highly active memory regions (48GB) in less than 100sec. You need Cisco UCS though, they have Ethernet QOS with their FCOE based UCS architecture (blade servers).

By: jason

Fri, 10 Dec 2010 16:18:27 +0000

@Heiko I did some testing a few weeks ago myself and came to the conclusion that this setting in the vpxd.cfg file has been deprecated in vSphere 4.1. Furthermore, simultanous vMotions are capped at 4 between 2 hosts. I'm going to assume that the cap actually applies at each host endpiont rather than at a pair of hosts. ie. all of the below could be ocurring simultaneously (again, this should be tested/proven before considered gospel): 1Gbhost A -> 1Gbhost B = 4 concurrent vMotions 1Gbhost C -> 1Gbhost D = 2 concurrent vMotions 1Gbhost C -> 1Gbhost E = 2 concurrent vMotions 1Gbhost D -> 1Gbhost E = 2 concurrent vMotions Similarly, the cap at 10GbE I'm assuming is going to be 8 concurrent vMotions as this is the supported limit VMware has published for 10GbE in vSphere 4.1. ie. all of the below could be ocurring simultaneously (again, this should be tested/proven before considered gospel): 10Gbhost A -> 10Gbhost B = 8 concurrent vMotions 10Gbhost C -> 10Gbhost D = 4 concurrent vMotions 10Gbhost C -> 10Gbhost E = 4 concurrent vMotions 10Gbhost D -> 10Gbhost E = 4 concurrent vMotions

By: Heiko

Fri, 10 Dec 2010 07:41:44 +0000

Hello, we followed your instruction but did not get the estimated result. We have got a two node cluster with vSphere 4.10, 320092 After changing the config, the maximum of the simultaneous transfered vms stayed at 4. Is there anything we have to change? The dedicated vMotion Ethernet Connection has 1GBit. Many greetings Heiko

By: Change number of simultaneous vMotion operations in vSphere 4.1 « Robin CM's IT Blog

Fri, 08 Oct 2010 08:23:08 +0000

[...] previously adjusted the vpxd.cfg file to allow more simultaneous vMotion operations, as per here. On the new server, because it was a fresh install of vCenter (as per chapter 5 of the vSphere 4.1 [...]

By: OferP

Thu, 12 Aug 2010 09:08:26 +0000

I followed the instructions: Edited the "C:\Documents and Settings\All Users\Application Data\VMware\VMware VirtualCenter\vpdx.cfg" to values: 24, 32, 48; and restrted the “VMware VirtualCenter Server” Service. Then from the vClient (where I set 8 VMs as one group on DRS cluster level), I tried to migrate 8 (and also 5) VMs simultaneously, and saw them migrating up-to 2 at the time. My setup includes 2 esx4.1 servers connected back to back via 10GE, and I'm mostly interested in VM migration (less with storage migration). Additional server runs the vCenter (win2008server-64). I wonder if someone can send me detailed instructions (or even better - a script) for several concurrent VMs migration? Ofer

By: Robert

Thu, 11 Mar 2010 15:29:50 +0000

I wish to modify my previous post. When we tried to manually VMotion only 1 VM VMotioned at a time. However when we created a DRS Cluster and retried the experiment it worked as advertised both manually and automatically. Sorry for the confusion and thanks for the initial posting!

By: Robert

Thu, 11 Mar 2010 14:43:21 +0000

We just tried this procedure on a vSphere (ESX4/vCenter4) system and we could not get it to work. I assume that the vpdx s/b vpxd. We changed the maxCostPerHost to 16 then tried to VMotion 4 VMs. They VMotioned 1 at a time. Is there some other method for enabling this in vSphere?

By: Increase Allowed Simultaneous VMotions of VMware Guests | VM /ETC

Wed, 20 Jan 2010 12:10:46 +0000

[...] Guest blog entry: VMotion performance » – VMware … [...]

By: vMotion performance « Virtual Hints

Thu, 14 Jan 2010 15:38:09 +0000

[...] it takes to do this, when I decided to see if there was a way to make it faster. I found a post on: that shows you how to do it. I have updated the paths so they are correct for 2008 R2, and fixed a [...]

By: Josh A

Fri, 11 Sep 2009 14:17:37 +0000

The plot provided showing network performance does not display the value for the vertical axis. I'm curious as to how much of the vMotion network bandwidth was utilized when performing 6 concurrent vMotions. I'm presuming (based on plot) you were utilizing 60-80% of a 1GB pipe.

By: Welcome to vSphere-land! » VMotion Links

Tue, 19 May 2009 13:40:50 +0000

[...] Compatibility (EVC) - Intel Example AMD and Red Hat Demonstrate Cross-Platform Live Migration VMotion Performance VMotion and Change Management VMotion fails at 10 percent Author: esiebert7625 Categories: [...]

By: Simon Long

Mon, 13 Apr 2009 12:40:46 +0000

Hi Rob, i agree in theory with what you are saying, I would be really interested to hear any test results that you come back with. I know that my tests were not as controlled as they should be. Regards Simon (