Severity: 14, Logon Login failed . Reason: Failed to open the explicitly specified Database

I tried to figure it out from someone recommend to find out who tried to login the database.
The user is me and is a database sysadmin. So it slap backup the wrong solution.
What caused it?

From Dell
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03880916&cc=us&dlc=en&lc=en

SQL Server I/O requests taking longer time to complete on the physical database file and terminated the sqlserver process explicitly
CAUSE: Failed to open the explicitly specified database 'XXXXX'. SQL Server I/O requests taking longer time to complete on the physical database file and terminated the SQL server process explicitly. A delay occurs when the MPIO handles the I/O requests. Mpio,msdsm,SCSI read/write opcode to the iSCSI target, the computer crashes