This was a troublesome error, because there is not much information available on what is going wrong. I looked the application log, SQL Agent Error
Calgary SQLPASS Chapter – SQL Presentation on SQL Server 2014: In-Memory OLTP Engine –
Will be speaking about SQL Server 2014 In-Memory OLTP Engine @ The Calgary SQLPASS Chapter @ Microsoft Office Calgary. If your in town please register
Missing registery settings in cluster nodes for SQL Server
I run into this occasionally, I think in last 3-4 years being SQL Server PFE, I have seen this issue total of 4 times. So
The Database Engine system data directory in the registry is not valid
Recently I was helping a client with this issue; they were trying to repair their instances due to some registry setting issues. However kept getting
How do I calculate database growth 12 months from now?
How to calculate database growth over 12 months?
Help! How do I find disk I/O problems?
This is a big topic, so the advice below is not meant to be comprehensive; but more of generaly troubleshooting walkthrought that you can use
SQL Canada (SQLCAN) 