vSphere Replication

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  • 1.  Slow Performance Replicating a SQL Busy Server VM

    Posted Sep 22, 2016 01:01 PM

    Greetings all--  Looking for some advice here.  Attempting to replicate a SQL Server VM and it never finishes a proper sync even with a 24hour RPO.  Anyone know of any tips or tricks on tweaking/fine-tuning either the SQL instance, VM, or vSR Appliance/server to make this guy go better?  Bandwidth/latency/host/san performance are all excellent.  Running vSphere 6 on target site, vSphere 5.5 on source site, and vSR 6.1.1 Appliance/servers.

    Thanks for the help!



  • 2.  RE: Slow Performance Replicating a SQL Busy Server VM

    Broadcom Employee
    Posted Sep 22, 2016 06:27 PM

    Upgrading to vSphere 6 on the source will help as there have been a number of performance improvements made that will impact VR. This is because the host at the source is where the replication starts (it contains the vSCSI filter,

    Are you using application consistency? If you are I'd recommend trying with it off.

    What is the change rate on this VM? Have you run it through the VR calculator? http://www.vmware.com/vrcalculator



  • 3.  RE: Slow Performance Replicating a SQL Busy Server VM

    Posted Sep 22, 2016 07:00 PM

    GS-- Thanks for the response.  Was hoping to avoid the upgrade at this time.  That said, I'm unfamiliar with "application consistency".

    I do believe we've narrowed it down however.  This SQL Server is actually the receiving end of a SQL Mirror of multiple SQL databases.  Pausing the SQL Mirror and this VM syncs in seconds. 



  • 4.  RE: Slow Performance Replicating a SQL Busy Server VM

    Broadcom Employee
    Posted Sep 22, 2016 07:14 PM

    Application consistency is VSS, sorry.

    That makes more sense. I'd guess that the change rate of all of those DBs was high?