Actually, my understanding is that the replica count actually refers to how many bricks each file will be replicated to. The distinction is that if you have multiple bricks on a single server, you can create the volume in such a way that all replication is done within that single server.
In order to make sure that replication happens ACROSS servers, you must make sure that the bricks defined in the gluster create volume stanza look like this: Gluster volume create replicate 2 <server1>:/brick1 <server2>:/brick1 <server1>:/brick2 <server2>:/brick2 etc ... This construction will mirror each brick onto the other server, allowing complete failure of either server while still keeping the volume up. It's also handy for upgrading each server in turn without a service disruption. The documentation is not specifically explicit about this scenario and its implications ... or wasn't, last time I looked. James Burnash, Unix Engineering -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mohit Anchlia Sent: Wednesday, April 13, 2011 7:18 PM To: Craig Younkins; [email protected] Subject: Re: [Gluster-users] replica count documentation My understanding is that the file you are writing to is replicated accross "n" number of glusterfs servers. You define that "n" when creating volume. Try volume info command to see the replicas. On Wed, Apr 13, 2011 at 4:14 PM, Craig Younkins <[email protected]> wrote: > So these are probably dumb questions but I cannot find them anywhere in the > documentation. > > What exactly does the replica count paramater to the volume create command > mean? How many bricks each block is replicated to? > > How does one query for the replica count of a volume? > > Thanks! > > Craig Younkins > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > > _______________________________________________ Gluster-users mailing list [email protected] http://gluster.org/cgi-bin/mailman/listinfo/gluster-users DISCLAIMER: This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this in error, please immediately notify me and permanently delete the original and any copy of any e-mail and any printout thereof. E-mail transmission cannot be guaranteed to be secure or error-free. The sender therefore does not accept liability for any errors or omissions in the contents of this message which arise as a result of e-mail transmission. NOTICE REGARDING PRIVACY AND CONFIDENTIALITY Knight Capital Group may, at its discretion, monitor and review the content of all e-mail communications. http://www.knight.com _______________________________________________ Gluster-users mailing list [email protected] http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
