Thanks for explain.. So, you think, that with glusterfs, we can't have a replication between two (or more) different site over the wan, when both site are active (read and write functions) ? On 27 mai 10 20:07 "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. > <http://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> >
