Write back cache on SOFS CA share?

I'm finding some conflicting info on whether or not WBC is active on clustered CA shares.  Does anyone know for sure?  It makes sense that it would be write-through to guarantee data consistency, but at the same time I would think WBC is also mirrored per a mirrored virtual disk config.  

Here's what leads me to believe WBC is inactive on CA shares:


"Continuous Availability requires that data write-through to the disk to ensure integrity in the event of a node failure in SOFS, so everything is synchronous and any buffering only helps on subsequent reads, not writes."
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Cliff GaliherCommented:
You said you've found conflicting information? That statement (and everything else I've read) is pretty consistent that disks are wrote-through.

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Windows Server 2012

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