Failed to update database "<Database Name>" because the database is read-only.
Msg 1823, Level 16, State 2, Line 1
A database snapshot cannot be created because it failed to start.
Cumulative update information
Cumulative Update 2 for SQL Server 2012 SP1The fix for this issue was first released in Cumulative Update 2. For more information about how to obtain this cumulative update package for SQL Server 2012 SP1, click the following article number to view the article in the Microsoft Knowledge Base:
Article ID: 2688395 - Last Review: Jan 24, 2013 - Revision: 1