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Mysterious site collection created when provisioning My Sites in SharePoint 2016
When you create a My Site in SharePoint 2016, an unfamiliar site collection with a name starting with "sitemaster" is created.

This is due to a feature added in SharePoint 2016 called Fast Site Collection Creation. By creating site masters in advance, My Sites can be deployed quickly. You can verify that a site master exists by running Get-SPSiteMaster.
PS C:\> Get-SPSiteMaster -ContentDatabase WSS_Content
ContentDatabase : SPContentDatabase Name=WSS_Content
SiteId : b03307d6-7212-4e4e-8504-d2f91c75653d
TemplateName : SPSPERS#10
Language : 1041
CompatibilityLevel : 15
FeaturesToActivateOnCopy : {0ee1129f-a2f3-41a9-9e9c-c7ee619a8c33|00000000-0000-0000-0000-000000000000|;, f661430e-c155-
438e-a7c6-c68648f1b119|00000000-0000-0000-0000-000000000000|;, e9c0ff81-d821-4771-8b4c-246aa
7e5e9eb|00000000-0000-0000-0000-000000000000|;, fa8379c9-791a-4fb0-812e-d0cfcac809c8|0000000
0-0000-0000-0000-000000000000|;...}
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