One of our servers tells us it has Error 823 issues:
TITLE: Connect to Server
Cannot connect to ServerName. ADDITIONAL INFORMATION: Warning: Fatal error 823 occurred at Mar 1 2016 > 10:45AM. Note the error and time, and contact your system administrator. (Microsoft SQL Server, Error: 21)
The windows log is floated with the same message.
No connection to the sql server is possible. So DBCC CHECKDB cannot be used / executed.
I ran SQLIOSIM and it raised couple of errors that requests are outstanding for more than n sec on a specific drive.
A Similar issue happened last night on another system - and it looks like it was workarounded by a failover.
I don't know where to look at next since I cant even connect to the Sql Server.