Re: [Moosefs-users] geographical fun with MooseFS

[Roger S. <rog...@un...>]

How will this rack maps implemention be? Is is rack de-centric or 
co-centric?

RS

On 6/30/11 10:24 AM, Michal Borychowski wrote:
> Hi!
>
> This could be quite difficult to keep "distances" in IP addresses. We
> introduced rack maps which should be easier in the mainenance. It would be
> soon available in the public version.
>
>
> Regards
> Kind regards
> Michał Borychowski
> MooseFS Support Manager
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> Gemius S.A.
> ul. Wołoska 7, 02-672 Warszawa
> Budynek MARS, klatka D
> Tel.: +4822 874-41-00
> Fax : +4822 874-41-01
>
>
> -----Original Message-----
> From: Mike [mailto:isp...@gm...]
> Sent: Tuesday, June 21, 2011 5:02 AM
> To: moo...@li...
> Subject: [Moosefs-users] geographical fun with MooseFS
>
>
> What if someone wrote a patch for MooseFS that looked at the IP of the
> client, and the IP of the chunk servers that had the chunk the client
> wanted, and tried to pick the closest one?
>
> something like
>
>     client = 10.1.1.1
>     chunkserver with copy#1 = 10.1.1.2
>     chunkserver with copy#2 = 10.1.1.20
>     chunkserver with copy#3 = 10.1.2.2
>
> Those 3 chunk servers would be used in that order, since their IPs are
> closer to the client's IP (using a formula like a*256^3+b*256^2+c*256+d
> to calculate an integer? long int? based on an IP address).
>
> This way you could have "close" chunk servers respond to most of the
> requests from a client, but if no "close" server had the chunk you
> wanted, you could go to a "distant" one.
>
> Drop two IPs on the client's interface, and do some careful numbering,
> and you can even set preference on a machine on the same LAN.
>
> This might make for a really simple way to do "distant" archives that
> don't get used for reads unless they are the only source that's
> available, and other similar problems.
>
> writes would be a different problem.
>
> Thoughts? comments?
>
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