DAOS Bandwidth savings with local replicas

HCL Domino Domino Forum
1

I had a discussion today with a consultant about bandwidth savings with DAOS and need to confirm if his assumptions are true.

The scenarios is the following:

We have a small office with 10 users, working with local replicas and connecting to a domino Server via WAN.

Those 10 users receive an Email with a 10 MB attachment.

This means in my opinion that 10 times 10 MB are replicated over the WAN link to the users, if they haven received this attachment before.

The consultant tell me that the attachment would remain in the NLO on the server and wouldn’t need to be replicated to each user unless he want’s to access it.

For me it sounds like he is thinking about partial document replication (which I don’t want) and not DAOS

From what I understood the bandwith savings I have with DAOS enabled on the clients would be only, if a user replies to the mail.

If the mail.box is on ODS 51 the attachment wouldn’t be send again to the server and wouldn’t be replicated again if he stores the reply in his Sent mail folder. Others who would receive this mail would also not replicate the attachment a 2nd time.

This assumes that DAOS in enabled on all servers, clients and databases and all are on ODS version 51.

Can anybody confirm that?

Thanks!!

2

Subject: you are correct…

The attachments that are added to the mail file on the server have to come across the WAN to you . The savings is in the other direction - there is no need to send an attachment from your client to the server if the server already has a copy of it.

For example, Person A receives an email with a 10MB attachment. The entire attachment is sent across then WAN to the local mail replica. Now, Person A forwards the message to Person B (in the same office). Without DAOS, two new copies of the attachment would be sent across the WAN (one for the message to Person B, one as a ‘sent’ message in Person A’s mail file). With DAOS, these two copies do not go across the WAN. Now, Person B receives the mail message - the attachment has to come across the WAN again in order to be placed in Person B’s mail file replica. In this scenario, the WAN traffic is cut in half.

See this technote: http://www-01.ibm.com/support/docview.wss?uid=swg21411307