Re: ceph on peta scale

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>> however for geographic distributed datacentres specially when network
>> flactuate how to handle that as i read it seems CEPH need big pipe of
>> network

>Ceph isn't really suited for WAN-style distribution. Some users have
>high-enough and consistent-enough bandwidth (with low enough latency)
>to do it, but otherwise you probably want to use Ceph within the data
>centers and layer something else on top of it.

Indeed.
Ceph is not aware of WAN links.
So reads and writes will be done remotely even if there is a copy locally.
Bandwidth might not be much of an issue but latency certainly will be.
Although bandwidth during a rebalance of data might also be problematic...

Cheers,
Robert van Leeuwen
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