Hi Andrew, thanks for your response. I can use Gluster client. I would expect more straightforward approach for reliability. Gluster client could be configured during "mount" with IP addresses of all mirrors. I thought that I'm missing something, but it looks that it's not in the design at all :-( The good news is that according to you Gluster client can switch between mirrors. That means it should be relatively easy to ad multiple IP configuration. Thanks, Sergiy. --- On Wed, 1/19/11, Andrew S?guin <aseguo at gmail.com> wrote: > From: Andrew S?guin <aseguo at gmail.com> > Subject: Re: Is mirroring provides failover protection? > To: "Sergiy Lozovsky" <serge_lozovsky at yahoo.com> > Cc: gluster-users at gluster.org > Date: Wednesday, January 19, 2011, 2:10 AM > Hi, > > Assuming the replication works fine (you see the files on > both servers > A and B) and that you use the Gluster client (mount -t > glusterfs ...), > then if server A goes down, your application will continue > seamlessly > to use server B although you could encounter problems > later: > > If the server with your application has to restart, and > server A is > down at that moment, then unfortunately the gluster client > does not > connect to a gluster server, and does not get to know that > server B > exists. > > To avoid that problem, you can prepare your Gluster cluster > system > with 3 IP addresses: server A, server B, and a "shared" IP > for the two > nodes which will be active only on one of the two servers > at a time. > Some system then has to decide which server is currently > master -- the > CARP protocol could be of help here. Maybe the following > blog/howto > would be of help for this: > http://www.misdivision.com/blog/setting-up-a-highly-available-storage-cluster-using-glusterfs-and-ucarp > > With NFS & CIFS the clients don't know about the second > server, in > case you do not have a shared IP, the connection would be > broken. NFS > without the shared IP is the same as having an offline > backup but with > the advantage that the backup is up to date. > > While I'm not a gluster expert, I hope this helps! > Andrew > > > On Sat, Jan 15, 2011 at 2:03 AM, Sergiy Lozovsky > <serge_lozovsky at yahoo.com> > wrote: > > Hi, > > > > I have two Gluster servers A and B. They are mirrored. > I mount A. What happens when server A goes down? > > > > I would like for my applications to seamlessly use > data from the Gluster storage B. > > > > Thanks, > > > > Sergiy. > > > > > > > > _______________________________________________ > > Gluster-users mailing list > > Gluster-users at gluster.org > > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > > >
