Juju MySQL adding units vs adding new service with relation

Posted by user2291975 on Ask Ubuntu See other posts from Ask Ubuntu or by user2291975
Published on 2013-10-31T21:39:03Z Indexed on 2013/10/31 22:17 UTC
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What's the point of adding units to MySQL? Why not just create a new service with relation to the master node?

MySQL doesn't support multi-master node so adding units to one MySQL service doesn't make any sense. If I create a second service as a slave and add units to that to act as multiple slaves still doesn't make sense because if the primary slave server dies all the unites attached to it become useless as well.

Can anyone explain why I should add units to MySQL?

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