hi.. im running a distributed zimbra installation ( with 3 mtas and one mailbox store). Periodically i see that the mysql server stops running for no reason. Email still appears to be flowing during that period.. i out of fear just restart the zimbra services.
when i restart the zimbra services everything goes back to a working state for an hour or so and then i see in the logs ( watch zmcontrol status) that mysql is not running again.. what could be responsible for this, and what can i do to stop it?
The mailbox server (installed with everything but mta service) has 16GB of RAM, and we set mysql memory percent to 10, after varying it from 12 and 11 ( to keep it below or just at 2GB as recommended.