temp directory server not writable

[chriz]

Got this error today:
Error writing file '/tmp/mysql.log' (Errcode: 28 )

But I did not change anything. Why would this happen?

Chriz
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[Pekka]

If it is a mysql error you can get the meaning of the error code by using perror command in shell:

http://dev.mysql.com/doc/mysql/en/perror.html

Most likely error 28 is "No Space left on device" in other words "disk full".