EC2 within/across Zone latency
does anybody have any experience with running a couchbase cluster across different zones but in the same region? I.e. is it OK to have a 3-node cluster running in eu-west-1a and 1b and 1c (as opposed to have all 3 in 1b) latency/performance wise. In the guide it says to set them up in different regions which makes sense as latency is high across regions but there is no comment on if there are any across zone issues.
Appreciate any thought on this,