Today we're gonna take a quick look at a very generic error: Error 21.
You will usually get a message along the lines of "The operating system returned error 21" along with something like "The device is not ready". The second part of the error is the important bit as it specifies that, for whatever reason, the 'device' (usually your drive or the actual files on it) is not ready.
This could be due to a number of reasons (hence the generic nature of the error):
- Drive disk space issue
- Hard drive failure
- SAN failure
- Corrupt database files (MDF/LDF etc)
I would say after you check out what might be causing the issue as well as rectify it, you run a DBCC CHECKDB to ensure that you do not have any consistency issues with you database(s).
DISCLAIMER: As stated, I’m not an expert so please, PLEASE (by all means!) feel free to politely correct or comment as you see fit. Your feedback is always welcomed. :-)
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