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February 13th, 2018 08:00
RPO for ECS replication
Is there a way to determine the replication RPO of data that is written to a federation? A customer is looking at his system, and he sees that some of his data appears to be taking hours to get to the remote site, even though it's a fully replication configuration. I realize the replication is asynchronous. What prompts the replication? I've been asked by several customers how they can determine the RPO of data written to an ECS.
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CBR
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February 13th, 2018 09:00
Hi,
The RPO information is listed in the dashboard, that shows replication rate, and data pending.
With 3.2 coming out soon, there will be greater accuracy in the dashboard, so it'll be better.
ECS transfers data to the replication queue as soon as it's in the primary site, so there is no "prompt" as such, it's continuous.
Regards
Christoffer
CBR
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February 13th, 2018 10:00
Ohh, that's far more simple - what goes in, goes out for replication.
ECS does not do any scaling, it just goes full on, so you can do a rough calc based on the replication pipe and the front-end ingest. Of course, the more ingest, the slower the replication once you start to saturate the front-end.
Can you lead me to any of the other resources for RPO calculation that you are referring to? I'd like to see what kind of docs we have on this, and see if it's relevant to add something similar to the ECS docs.
bellitech
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February 13th, 2018 10:00
Knowing the RPO after the implementation is good, but customers are asking me how they can determine or calculate the RPO ahead of time. I understand there's no way to control it at this time, but customers are telling me they need to understand whether the RPO will be 10 minutes or 2 hours. We can reasonably calculate an RPO for other Dell EMC replication scenarios.
bellitech
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February 14th, 2018 05:00
Over the years, there have been several different tools. I haven't used many recently, as I no longer do installations. However, here's a good link to the tools. BCSD is one I used for both SRDF replication and RecoverPoint. However, it's a pretty complex application. Unity Replication Sizer may be good. I haven't used it, though. I would be cool to have a simple website where we could type in the appropriate configuration details and get an approximate RPO.
By the way, if you want to send me the formula for the RPO, I can help you out with this, if you'd like.
https://psapps.emc.com/central/applications