Re: CRUSH maps for multiple switches

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[Please keep conversations on the list.]
On Mon, May 13, 2013 at 9:15 AM, Gandalf Corvotempesta
<gandalf.corvotempesta@xxxxxxxxx> wrote:
> 2013/5/13 Gregory Farnum <greg@xxxxxxxxxxx>:
>> What's your goal here? If the switches are completely isolated from each
>> other than Ceph is going to have trouble (it expects a fully connected
>> network), so I think the answer to your question I "no". But maybe you mean
>> something else and I'm just missing it. :)
>
> My goal is start with a small 10GbE switch and then add more switched
> when needed without
> loosing network ports by interconnectin them (that ports will also be
> a bottleneck, because i'll have 11 10GbE ports that will need to reach
> the other 11x 10GbE ports on the second switch with a single 10GbE
> link)

So you want to shard up your network and have the only common points
be the computers attached to multiple NICs? There are systems that
work like this in supercomputers, but they require all kinds of
specialized work and don't use TCP/IP. Unless there's a big disconnect
in my understanding, Ceph doesn't support this and never will — it's a
standard TCP/IP user and this network topology would never work for
any of those systems.
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com
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