The passive node should not be shared by any other SQL instance.

Dears,
the customer has SQL cluster  with multiple instance for many technology.  Can I install new instance to host Lync backend database or not ??? 
I found in the below URL
"SQL Clustering support is for an active/passive configuration. For performance reasons, the passive node should not be shared by any other SQL instance."
I want to understand Why Lync 2013 the backend SQL passive node should not be shared by any other SQL instance. whish is mean that I can not install SQL new instance to host LYNC backend on the current my SQL cluster which is work with multiple  instance
http://technet.microsoft.com/en-us/library/gg398990.aspx
Amr Nassar

Hi Amr,
Yes you can install a new instance on your cluster to host the Lync back end database. I believe the statement about not sharing the passive node with any other SQL instance refers to a SQL instance outside of the A/P cluster. (Basically the passive node
should be purely that and able to handle the load in the event it becomes the active node without anything else hindering it)
Providing your SQL cluster is able to handle the load Lync places on it along with everything else you should not have any issues.
If this helped you please click "Vote As Helpful" if it answered your question please click "Mark As Answer"
Georg Thomas | Lync MVP
Blog www.lynced.com.au | Twitter
@georgathomas
Lync Edge Port Check (Beta)

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