I am also interested in this scenario. Pablo On Mon, Aug 31, 2009 at 2:35 AM, Ran <smtp.test61 at gmail.com> wrote: > Hello , > Im tring to set up gluster volume but to use drbd to replicate 2 > vloumes insted of using the AFR translator , it took me 1 hour to > realize that the AFR is not stable for the following resones : > > in the example i tested 2 servers in AFR and distribute only 1 AFR > (possible add more but just test with 1 AFR volume) > > volume vo1 > type cluster/afr > # option data-self-heal off > # option metadata-self-heal off > # option entry-self-heal off > subvolumes storage1 storage2 > end-volume > > volume cluster > type cluster/distribute > option lookup-unhashed yes > subvolumes vo1 > end-volume > > - all workimg ok , then if node 1 is rebooed node 2 takes its place > and start serving KVM images ok also > but when node 1 comes back from reboot the KVM images is locked by server 2 > and the data is not replicated back to server 1 > i read the gluster papers regarding this issue with opened files that > were opened when the otehr member of the AFR is not online and its a > big issue seens > if server 1 just reboot for a minut then all replication is no good anymore > > So i guues in this stage and limitation its better be called 1 way > replication with limitations and not proof for production use . > > In any case i decided to do the redundency of server 1 and 2 with DRBD > wich is very stable and use gluster for its better abilities such as > option of growing the file system in the future if needed and the > client fail safe to other member node if 1 member is not online insted > of using linux HA(heatbeat) > > I tested few client VOL configs and noticed that its not quite simple > > If i ommit the AFR translator and use only > > volume cluster > type cluster/distribute > option lookup-unhashed yes > subvolumes storage1 storage2 > end-volume > > with or without option lookup-unhashed yes > then after a while every file show up 2 times in the mount point > and its also not clear how the distribute will work on 2 DRBD(same volumes) > > Is there any way to implement this aka AFR translator that doesnt > replicate at all e.g just bond the 2 nodes to 1 volume for load > balanced and distribute perposes . > > I realy like gluster for its simplicity and if will be implemnted > right and will work ok too then its much better then other file > systems in that category like lustre for my needs anyway . > > sorry for my english . > > Rob . > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users >
