Thanks your help,Kaushal M I understand that you mean
Thank you very much! 2014-04-30 14:32 GMT+08:00 Kaushal M <[email protected]>: > My understanding was a little incorrect. AFR (the glusterfs translator > which actually handles replication), works in the following way. > > 1. AFR gets an operation > 2. AFR sends the operation to all available replicas. This means only > those replicas which are online. If none are online, AFR returns with error. > 3. AFR waits for replicas to return with success or failure. > 4. If all replicas to which the operation was sent return with failure, > AFR returns with failure. Even if one replica returns with success, AFR > returns success. > > So, to answer your question gluster return an error only if the write > fails on all available replicas or if none of the replicas are available. > If the write succeeds on even one replica, but fails on others gluster will > return success. > > Hope this clears your doubts. > > ~kaushal > > > On Wed, Apr 30, 2014 at 7:40 AM, 可樂我 <[email protected]> wrote: > >> Thanks Kaushal M. >> >> When I write file into glusterfs replication volume, >> if one replica write failure(brink server offline or brick mount point >> has deleted), >> it will tell me write failure, this is write operation failure >> >> Cloud glusterfs do this? >> Or I have only way to find it in log file?? >> >> Thank you very much!!! ^^ >> >> >> >> 2014-04-30 0:35 GMT+08:00 Kaushal M <[email protected]>: >> >> A write will return after it completes on all of the replicas that are >>> up. In your example, you have replica 2, but only one of the bricks is >>> up. So write will return after it finishes on the up brick. The data >>> that was written to just one replica will be copied over, or healed to >>> the other replica when it comes back online. This healing is done via >>> the self-heal mechanism. >>> >>> On Tue, Apr 29, 2014 at 8:25 PM, 可樂我 <[email protected]> wrote: >>> > Thank your help, Kaushal M >>> > >>> > but I have some question about it >>> > >>> > I create glusterfs replica volume in different brick in different node >>> > like this >>> > #gluster vol create test-vol node-A:/brick1 node-B:/brick2 >>> > >>> > I mount this volume on /mnt >>> > #mount.glusterfs node-A:/test-vol /mnt >>> > >>> > I write file by using dd cmd >>> > #dd if=/dev/zero of=/mnt/test-file bs=1M count=2048 >>> > >>> > i shudown node-B when the dd cmd is executing >>> > >>> > wirte test-file is still finish without any error or report any error >>> msg >>> > >>> > if it return only after it is completed on all the replicas. >>> > I think it would occur some error >>> > >>> > I don't understand why it can still finish without error >>> > >>> > Thanks!! >>> > >>> > >>> > 2014-04-29 22:38 GMT+08:00 Kaushal M <[email protected]>: >>> > >>> >> For a replica volume a write will return only after it is completed on >>> >> all the replicas. >>> >> >>> >> On Tue, Apr 29, 2014 at 8:06 PM, 可樂我 <[email protected]> wrote: >>> >> > Hi everyone, >>> >> > I have some questions about replication >>> >> > >>> >> > when i write file into glusterfs volume, it is 2 replica volume. >>> >> > does it return ok when one of the replica write operation complete >>> or >>> >> > both >>> >> > replica write operation complete? >>> >> > >>> >> > Can I require it return ok when all replica write complete? >>> >> > >>> >> > sorry~ my English is poor >>> >> > I wish you can understand my qeustions >>> >> > Thank you very much! >>> >> > Thanks! >>> >> > >>> >> > >>> >> > >>> >> > _______________________________________________ >>> >> > Gluster-users mailing list >>> >> > [email protected] >>> >> > http://supercolony.gluster.org/mailman/listinfo/gluster-users >>> > >>> > >>> >> >> >
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