How exactly does rgw work?

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Hello all,

We're currently waiting on a delivery of equipment for a small 50TB proof of concept cluster, and I've been lurking/learning a ton from you. Thanks for how active everyone is.  

Question(s):
How does the raids gateway work exactly? 
Does it introduce a single point of failure? 
Does all of the traffic go through the host running the rgw server? 

I just don't fully understand that side of things. As for architecture our poc will have:
- 1 monitor 
- 4 OSDs with 12 x 6TB drives, 1 x 800 PCIe journal 

I'd all goes as planned, this will scale up to:
- 3 monitors
- 48 osds

This should give us enough storage (~1.2PB) wth enough throughput to handle the data requirements of our machines to saturate our 100Gb link...





Cheers,
G
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