On Thu, Nov 21, 2019 at 8:29 AM Vikas Rana <vrana@xxxxxxxxxxxx> wrote: > > Hi all, > > > > We have a 200TB RBD image which we are replicating using RBD mirroring. > > We want to test the DR copy and make sure that we have a consistent copy in case primary site is lost. > > > > We did it previously and promoted the DR copy which broken the DR copy from primary and we have to resync the whole 200TB data. > > > > Is there any correct way of doing it so we don’t have to resync all 200TB again? Yes, create a snapshot on the primary site and let it propagate to the non-primary site. Then you can compare checksums at the snapshot w/o having to worry about the data changing. Once you have finished, delete the snapshot on the primary site and it will propagate over to the non-primary site. > > > Can we demote current primary and then promote the DR copy and test and then revert back? Will that require the complete 200TB sync? > It's only the forced-promotion that causes split-brain. If you gracefully demote from site A and promote site B, and then demote site B and promote site A, that will not require a sync. However, again, it's probably just easier to use a snapshot. > > Thanks in advance for your help and suggestions. > > > > Thanks, > > -Vikas > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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