The Ceph Backlog [1] has several potential improvements for rbd-mirror under the RBD category. [1] https://trello.com/b/ugTc2QFH/ceph-backlog On Sat, Apr 7, 2018 at 11:06 PM, YuShengzuo <yu.shengzuo@xxxxxxxxxxx> wrote: > Hi Jason, > > Thanks for your answer about my questions, I got lot !!! > Is there anywhere to record the blueprint about rbd-mirror ? > I'm insteresing in rbd mirror and want to do something to help improving it! > > Best regards > Yu Shengzuo > > On 04/04/2018, 9:07 PM, "Jason Dillaman" <ceph-devel-owner@xxxxxxxxxxxxxxx on behalf of jdillama@xxxxxxxxxx> wrote: > > On Tue, Apr 3, 2018 at 11:36 PM, YuShengzuo <yu.shengzuo@xxxxxxxxxxx> wrote: > > Hi Jason, > > > > > > > > Some questions about rbd-mirror: > > > > > > > > About the ‘split brain’ state of RBD: > > > > One use case is primary cluster all down, then promote secondary cluster > > rbd. > > > > And Now if we recover primary cluster and demote rbd to sync from one in > > secondary. > > > > The state of this rbd will be ‘split-brain’, and we have to do ‘image > > resync’. > > > > > > > > In this case, > > > > why the ‘split-brain’ state is necessary? > > The split-brain state is necessary because site A and site B versions > of the image can now be different. > > > Any soft way to do ‘resync’ , just sync different data from secondary > > rbd-journal? > > Not right now but it would be possible provided that the > force-promoted image was 100% up-to-date w/ the original primary > image. There is also a goal (of mine at least) to get OSD support for > deep-deletion of objects (where all snapshot clones are deleted, not > just the HEAD revision) so that could roll-back changes from the > original primary image by copying the affected objects from the > force-promoted image. > > > （So violence about resync， delete and wait 30s to sync again） > > > > About network of rbd-mirror process: > > > > The bandwidth will be used much when syncing. Any way to set the work of > > rbd-mirror to use > > > > an independence network card ? > > > > If your site A and site B Ceph clusters are in different subnets, > standard network routing rules would move your mirroring traffic to > the specified NIC. > > > > > > > > > That is all, Hope your return. Thanks > > > > > > > > Best regards > > > > Yu Shengzuo > > > > > > > > -- > Jason > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- Jason -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
