mtassin, I believe Bob is quoting BOL in that paragraph.
I had found that link earlier and figured BOL would be the authoratative source. Thanks for clearing that up for us.
Bob says "The lazy writer thread creations are tied to the SQL OS view of the physical NUMA memory nodes. So whatever the hardware presents as physical NUMA nodes will equate to the number of lazy writer threads that are created."
So no matter how many soft NUMA nodes you have, the number of lazy writer threads is based on the presence of hardware NUMAs.
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