How does mongodb replica compare with amazon ebs? -

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i new mongodb , amazon ec2.
seems me mongo replicas here : 1/ avoid data loss , 2/ make reads , serving faster.
in amazon have ebs thing. understand global persistent storage, dropbox instance.
there need have replicas if amazon abstracts away need of ebs ?
in advance
thomas

let me clarify couple of things.

ebs san volume if used working within existing technologies. can attached 1 instance, still has limited io throughout. using raid can maximize io, provisioned iops can maximize throughput.

ideally however, mongodb, want have enough memory indexes can accessed within memory, performance drops if disk needs hit.

mongo can use replicas, used failover , replication (you can send reads slave, writes need hit primary), , sharding used split dataset increase performance. still need these things anyway if using ebs storage.


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