Tagged: cluster

Exchange 2010-2016 Database Availability Group (DAG) cluster timeout settings for VMware

Symptom:

Exchange 2010-2016 Database Availability Group (DAG) active database moves between DAG nodes without any reason, when the DAG nodes are VMware Virtual Machines. This may be due to the DAG node being VMotioned by vSphere DRS cluster.

Solution:

The settings below allow you to VMotion without DAG active databases flipping between nodes for no reason.

Although the tip below is mainly useful for Multi-Site DAG clusters, I have seen this flipping happen even within the same site. So, the recommendation is to do these commands on ANY DAG cluster that is running on VMware.

Instructions:

Substitute your DAG name for an example DAG name below, yourDAGname or rpsdag01.

On any Mailbox Role DAG cluster node, open Windows PowerShell with modules loaded.

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Type the following command to check current settings:

cluster /cluster:yourDAGname /prop

Note the following Values:

SameSubnetDelay

SameSubnetThreshold

CrossSubnetDelay

CrossSubnetThreshold

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Type the following commands to change the timeout settings.

cluster /cluster:yourDAGname /prop SameSubnetDelay=2000

cluster /cluster:yourDAGname /prop SameSubnetThreshold=10

cluster /cluster:yourDAGname /prop CrossSubnetDelay=4000

cluster /cluster:yourDAGname /prop CrossSubnetThreshold=10

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Type the command to check that settings took

cluster /cluster:yourDAGname /prop

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You ONLY need to run this on ONE DAG node. It will be replicated to ALL the other DAG nodes.

More Information:

See the article below:

http://technet.microsoft.com/en-us/library/dd197562(v=ws.10).aspx

My tips published in VMware “vSphere Design Pocketbook” 2nd edition

vSphere-pocketbook-blog-edition-coverFor the 2nd year in a row, Frank Denneman and PernixData published me in “vSphere Design Pocketbook – 2.0.”

The book has “no fluff” guidance on building VMware vSphere.

Get a free copy here:

http://info.pernixdata.com/vsphere-pocketbook-2.0?MS=T

Those at VMworld 2014 can get a printed copy in PernixData booth #1017.

Thank you to the panel: Frank Denneman, Duncan Epping, Brad Hedlund, Cormac Hogan, William Lam, Michael Webster, and Josh Odgers, who picked my contribution. Here is how the process transpired:

http://frankdenneman.nl/2014/08/07/pre-order-vsphere-pocketbook-blog-edition/

I don’t yet know which one of my entries was published. Once the book is released at VMworld, I will update.

Unfortunately, this year I cannot make it to VMworld 2014, but I hope my friends will bring me a printed copy.

My tips published in VMware “vSphere Design Pocketbook.”

vSphere Design PocketbookMy tips were published in a book called “vSphere Design Pocketbook.”

The book has to the point guidance on building VMware vSphere, without any fluff.

Get a free copy here:

http://info.pernixdata.com/vSpherePocketbook#!

Those at VMworld 2013 got a print copy.

Thank you to the panel: Frank Denneman, Duncan Epping, Cormac Hogan, Jason Nash & Vaughn Stewart who picked me from 500+ entries. Here is how the process transpired:

http://frankdenneman.nl/2013/08/21/announcing-the-vsphere-design-pocketbook-contributors/

http://frankdenneman.nl/2013/09/10/free-ebook-version-of-the-vsphere-design-pocketbook-is-now-available/

I was surprised to learn that the submissions I considered to be my best were not picked. Instead, entries in the areas of vCenter design and vSphere cluster design were selected.

I had a chance to meet Frank Denneman at VMworld 2013 and he signed my book. Thank you Frank for wonderful advice on being Social — I am relatively new to the  trade and this was a major success. I am learning from the masters.

I also met Duncan Epping, Cormac Hogan and Vaughn Stewart. Unfortunately, I could not track down Jason Nash – maybe another time.

Here is me with Duncan Epping  at VMworld 2013 holding the book — star struck.

Yury Magalif with Duncan Epping at VMworld 2013