[Gluster-users] Question re 2-server Mirrored setup

[Raghavendra G]

----- Original Message -----
From: "Raghavendra G" <raghavendra at gluster.com>
To: "Andy Sy" <andy.sy at neotitans.com>
Cc: gluster-users at gluster.org
Sent: Wednesday, July 29, 2009 9:33:34 PM GMT +04:00 Abu Dhabi / Muscat
Subject: Re: [Gluster-users] Question re 2-server Mirrored setup


----- Original Message -----
From: "Andy Sy" <andy.sy at neotitans.com>
To: gluster-users at gluster.org
Sent: Sunday, July 26, 2009 7:45:28 PM GMT +04:00 Abu Dhabi / Muscat
Subject: [Gluster-users] Question re 2-server Mirrored setup

In the sample config for a 2-server mirror setup at:

http://gluster.org/docs/index.php/Automatic_File_Replication_(Mirror)_across_Two_Storage_Servers

both volumes are considered remote and use
tcp as transport-type.  If you intend to use
a local volume as one of the 2 servers in a
mirrored setup, is there any advantage in defining
glusterfs.vol as below?

volume remote
   type protocol/client
   option transport-type tcp
   option remote-host w.x.y.z
   option remote-subvolume brick
end-volume

volume posix
   type storage/posix
   option directory /localstoragedir
end-volume

volume local
   type features/posix-locks
   subvolumes posix
end-volume

volume replicate
   type cluster/replicate
   subvolumes local remote
end-volume

yes, with read-subvolume specified to be local, reads will be faster.

 Also, since first child of replicate will be lock-server, keeping the local subvolume as first child will increase performance.

If there are more than one client, please note that the advantage of having local subvolume as lock server applies to only one client. For other clients, the local subvolume of the client mentioned above has to be specified as lock-server, which of course will be remote to these clients. Since first child is used as lock-server, please take care of the order in which children are specified in multiple clients.

read-subvolume to replicate can be specified using "option read-subvolume local"

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