Errors started last night on SQL Server, and when our server guy rebooted a whole drive disappeared and he had to rebuild the partition. From what I've read these errors mean that there is a an IO subsystem issue, where SQL Server is having difficulty talking to one of the drives. I read that it can happen with SAN multipathing and connectivity- but I really have no idea what I'm talking about. My boss wants me to figure out what caused these errors. Here they are in order:
LogWriter: Operating system error 21(The device is not ready.) encountered.
The log for database 'Administration' is not available. Check the event log for related error messages. Resolve any errors and restart the database.
fcb::close-flush: Operating system error (null) encountered.
The operating system returned error 21(The device is not ready.) to SQL Server during a read at offset 0000000000000000 in file 'E:\SqlData\Administration.mdf'. Additional messages in the SQL Server error log and system event log may provide more detail. This is a severe system-level error condition that threatens database integrity and must be corrected immediately. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online.
A file activation error occurred. The physical file name 'E:\SqlData\Administration.LDF' may be incorrect. Diagnose and correct additional errors, and retry the operation.
Any help is much appreciated.