Re: Ceph Network question

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Hello,

On Thu, 12 Jan 2017 10:03:33 -0500 Sivaram Kannan wrote:

> Hi,
> 
> Thanks for the reply. The public network I am talking about is an
> isolated network with no access to internet, but lot of compute
> traffic though. If it is more about security, I would try setting up
> both in the same network. My worry is more towards any performance
> issues (due to re-balancing between the nodes) by configuring both
> control and data in the same network?
>

Firstly, I think you'll have loads of "fun" getting this to work with
docker, but that's maybe just me.

I'm usually using only a single network, see my other mail just now for
potential security impacts.

You said you have a 10Gb/s link, can your OSDs actually saturate that
bandwidth, 1GB/s sustained writes to your disks? 
In most cases when people where wondering about this the answer is no.
 
Christian

> Thanks,
> ./Siva.
> 
> On Thu, Jan 12, 2017 at 9:35 AM, Oliver Humpage <oliver@xxxxxxxxxxxxxxx> wrote:
> >
> >> I do recommend separating your public and cluster networks but there's not a whole lot of benefit to it unless they are using physically separate links with dedicated bandwidth.
> >
> > I thought a large part of it was security, in that it’s possible to DOS the cluster by disrupting intra-OSD traffic. Even with message signatures turned on, it’s unwise to bet on there not being any security bugs.
> >
> > If you only have one 10Gb connection, perhaps consider separate VLANs?
> >
> > Oliver.
> >
> 
> 
> 


-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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