Tuesday, July 17, 2012

SQL Server Log: DeviceIoControl failed, error 21

This morning in log report of one of our production server I found an unusual  error.
DeviceIoControl failed, error 21
DeviceIOControl is a function which sends code to your disk drivers to perform read or writes functions and error 21 clearly indicates that device which we have specified to perform a job is not ready.
This happened because, on our production server, we had configured a backup job which takes daily full backup to a removable device and unfortunately it was removed by our systems department, which caused this error.

Read More about SQL Server Log Errors/Messages 

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