Forum Discussion
Exchange Server Role Requirements Calculator: DAGs required
Finally, I think I know what the problem is - My SPECINT2006 value was way off - I downloaded this tool "Exchange Processor Query Tool" https://gallery.technet.microsoft.com/Exchange-Processor-Query-b06748a5 and it calculated my SPECINT2006 value to be 645. Now the Calculator works correctly and recommends 1 DAG :-)
Here are the values. I understand that you would have 4x Database Copies per server - That is correct and there are 3 copies of a Database instance replicated - Two on the Primary Datacenter and One on the DR Datacenter.
But where do the 324 copies come from? I know that 9 x 36 = 324 - But that suggests I have 9 DAGs
Surely then the Database Copy Instance Configuration values should be multiplied by 9...?
I still don't get how the Calculator can recommend I use 9 DAGs?
Database Copy Configuration
Number of Database Copies
/ Server = 4
/ DAG = 36
/ Environment = 324
Database Copy Instance Configuration
Number of HA Database Copy Instances / DAG
/ Primary Datacenter = 2
/ Secondary Datacenter = 1
Total = 3
Adding VasilMichev and TonyRedmond Ross Smith IV to review your calculation
Finally, I think I know what the problem is - My SPECINT2006 value was way off - I downloaded this tool "Exchange Processor Query Tool" https://gallery.technet.microsoft.com/Exchange-Processor-Query-b06748a5 and it calculated my SPECINT2006 value to be 645. Now the Calculator works correctly and recommends 1 DAG :-)
Just be aware that the current calculator takes no account of the mitigations released for the Meltdown/Spectre vulnerabilities. Some impact is to be expected in most Exchange environments, but you will only be able to confirm the exact effect on performance by running a test load.
Thanks for sharing your findings. That shows how important is your SPECINT value.
are you hosting it on Physical Machines or on VM Platform?
VMWare Platform
Thank you for helping me get to the bottom if the issue ;-)
