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.
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