Gerry/Krishna,
In this specific setup what has been discussed, there is no need for
any kind of locking. The namespace lock what unify uses is when
glusterfs takes the responsibility of merging namespaces of multiple
storage bricks. In this specific situation (for AFR) there is no
namespace management. Hence even creation and read/write will be
handled by server VFS. You have to ensure that the primary child of
AFR is the same for all webservers.
regards,
avati
On Sun, Mar 04, 2007 at 01:39:58PM -0500, Gerry Reno wrote:
> Krishna Srinivas wrote:
> >Hi Gerry,
> >
> >If there are four machines: server1 server2 server3 server4
> >
> >server1 server spec file:
> >volume brick
> > type storage/posix
> > option directory /var/www
> >end-volume
> >
> >### Add network serving capabilities to the "brick" volume
> >volume server
> > type protocol/server
> > option transport-type tcp/server
> > option listen-port 6996
> > subvolumes brick
> > option auth.ip.brick.allow *
> >end-volume
> >
> >server1 client spec file will be like this:
> >volume client1
> > type storage/posix
> > option directory /var/www
> >end-volume
> >
> >volume client2
> > type protocol/client
> > option transport-type tcp/client
> > option remote-host server2
> > option remote-port 6996
> > option remote-subvolume brick
> >end-volume
> >
> >volume client3
> > type protocol/client
> > option transport-type tcp/client
> > option remote-host server3
> > option remote-port 6996
> > option remote-subvolume brick
> >end-volume
> >
> >volume client4
> > type protocol/client
> > option transport-type tcp/client
> > option remote-host server4
> > option remote-port 6996
> > option remote-subvolume brick
> >end-volume
> >
> >volume afr
> > type cluster/afr
> > subvolumes client1 client2 client3 client4
> > option replicate *:4
> >end-volume
> >
> >here all read() operations happen on client1 as it is mentioned
> >first in the list of subvolumes. so it serves your purpose.
> >
> >Let us know if you need more help.
> >
>
> Hi Krishna,
> Ok if I understand this correctly are you saying that I only need the
> server spec file on server1? Or do I need one on all servers?
> And I would need a slightly different client spec file on each client?
> If so, is there a way to write the client spec file so that the same
> client spec file could be copied to each node?
>
> Regards,
> Gerry
>
>
>
>
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--
Shaw's Principle:
Build a system that even a fool can use,
and only a fool will want to use it.
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