I first noticed the issue when I attempted an automated backup using Drush.
The issue seemed to be due to a previous issue where our web server ran out of hard disk space, which resulted many of the databases becoming locked.
In my case, when I needed to perform a backup Drush resulted in the following error:
“Database dump failed”
To further inspect the problem I initiated a manual mysqldump that also returned an error, but this time there was additional information provided along with the error.