> I know this high level texts about
> - scalability,
> - flexibility,
> - distributed,
> - cost-Effectiveness

If you are careful not to over estimate the performance, then you are ok.

> 
> Why not something from robin.io or purestorage, netapp, dell/EMC. From
> opensource longhorn or openEBS.
> 

:) difficult to say. I can remember years ago on a trade fare telling some 
Arabs to look at ceph when they were standing at the EMC booth. ;P If you want 
answers to such questions, I guess you are stuck with doing some really 
thorough research. I did not have such time, so for me it was that companies 
like CERN, NASA are(were?) using this on very large scale (thousands of disks 
for years) and contributing to the development.

Needless to say such storage solution is critical for your business so you need 
to have something reliable for the future. You don't want to do business with 
companies that all of a sudden change licensing like Elastic search did 
(robin.io -> rakuten cloud?) or looking only for a quick buyout. You want 
experienced competent people developing this for you. Although I am quite a bit 
annoyed with RedHat lately, my complements are really going out to this ceph 
development team ,as are my complements going out to universities contributing 
here.





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