You can do it but performance wise I would wait for the newer versions.. Michiel -------- Original Message -------- Subject: Re: Fwd: Glusterfs over wan? From: shayn at shayn.ch To: Patricio A. Bruna <pbruna at it-linux.cl>, Tejas N. Bhise <tejas at gluster.com> Date: 05/28/2010 11:13 AM > 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> >> >> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org >> http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
