AWS: Should my EC2 and RDS instances be in the same Availability Zone?

Posted by DOOManiac on Server Fault See other posts from Server Fault or by DOOManiac
Published on 2014-05-29T19:53:06Z Indexed on 2014/05/29 21:33 UTC
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amazon-ec2

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amazon-rds

I just noticed that all of our EC2 instances are in zone us-west-2b, but our Multi-AZ RDS instance is in us-west-2a.

Performance-wise everything seems to be okay, and it will be a hassle to "move" the instances to one place since you have to stop and re-create them all. However if either of the two zones goes down when we will have some downtime; if everything is in one zone then at least we have a higher chance of not being in the zone that has downtime...

Is this something worth fixing, or am I over-thinking it?

(I was about to purchase some EC2 Reserved Instances, which are tied to specific AZs, so I wanted to make sure before going through with it)

Thanks!

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