I'm looking forward to this feature. I'm planning on having 2 clusters - a primary and a DR. I would like to be able to replicate data from the production cluster to the DR, but would also like to see two way replication so that when I eventually implement BGP in a dual homed scenario I could have two independent systems replicating back and forth. Jeffrey Negro, Network Engineer Billtrust - Improving Your Billing, Improving Your Business www.billtrust.com 609.235.1010 x137 On Thu, May 27, 2010 at 2:07 PM, Tejas N. Bhise <tejas at gluster.com> wrote: > Patricio, > > All networked filesystems like nfs, cifs/samba and even GlusterFS can be > used over WAN. The problem arises for the more complex functionality, like > replication across a WAN. > > Replication over WAN has different meanings for different users - some just > want a good way to have a remote backup, others want a hot-cold kind of a > backup so namespace issue come into the picture, but its relatively easier > to solve as there is only one side active at a time. > > The most difficult one is to keep both sites active ( and R/W ) with their > own full namespace and security functionality with a designated unit of the > filesystem replicated. Access from each side looks like it just pulled data > from its own data cache and the currency of data could move around ( > potentially ) multiple locations across the globe. > > I don't think anyone does that last kind of replication. AFS and DFS from > the old days did go upto a certain point by providing R/O replication with > remote snapshots by providing integrated multisite security and namespace, > but no R/W replication. > > GlusterFS plan is to start with async WAN replication for remote backup and > slowly moving into the multisite cluster architecture and active active > replicated data copies with integrated namespace, which we hope to bring in > with a new unified ( write ) caching. > > Async WAN replication for remote backup might come in as early as end of > the year with the other functionality following sometime after that. > > I would like to hear more about how community users will put these > different levels of WAN replication to use, how much data would change on a > daily basis and hence get moved around, what kind of latency would be > acceptable to your applications ? I would also like to hear if anyone is > using other solutions/edge caching appliances etc to do this in other ways. > > Regards, > Tejas. > > ----- Original Message ----- > From: "Patricio A. Bruna" <pbruna at it-linux.cl> > To: gluster-users at gluster.org > Sent: Thursday, May 27, 2010 10:00:12 PM > Subject: Re: Fwd: Glusterfs over wan? > > Hi, > just for information, what file system are available to use over WAN? > > > ------------------------------------ > Patricio Bruna V. > IT Linux Ltda. > www.it-linux.cl > Fono : (+56-2) 333 0578 > M?vil: (+56-9) 7776 2899 > > > > > > > > > Hi Shayn, > > The problem is not replication speed. Actually that part is just fine, and > it's quite fast. > > The problem with WAN is that when the gluster client receives a request to > read the file, it first checks with all the nodes in the cluster, to make > sure there are no discrepancies. Only after all nodes have answered, it will > read the local file (if it's replicated locally). > > Also take into account that international links are not as reliable as > local LAN based links. If a node is suddenly inaccessible, it can slow down > everything (again because READ operations are dependent on all nodes in the > cluster answering, synchronously). > > I know that the gluster team are working on an async solution, down the > road, which would make glusterfs more suitable for WAN scenarios. > > My suggestion is NOT to try it, until the gluster team officially announce > WAN support. > > > > On May 27, 2010, at 4:31 PM, shayn at shayn.ch wrote: > > > > > Hello ! > > > > sorry for english, but, just don't understand why glusterfs is not > > destinated to be used over the wan ? > > I think that if the files are tiny, there's no problem to use this > > solution over wan.. ? > > > > But okay, if file are large.. (don't know .. 100MB - 200MB and more.) i > > understand that it depend of the internet connection and that's the > > replication can be so soo soo slow.. > > > > Please, give me some renseignments about this solution over wan > > > > Shayn_______________________________________________ > > Gluster-users mailing list > > Gluster-users at gluster.org > > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users >
