Dear Eugen, We have a scenario of DC and DR replication, and planned to explore RBD mirroring with both Journaling and Snapshot mechanism. I have a 5 TB storage at Primary DC and 5 TB storage at DR site with 2 different ceph clusters configured. Please clarify the following queries 1. With One way mirroring, the failover works fine in both journaling and snapshot mechanism and we are able to promote the workload from DR site. How does Failback work? We wanted to move the contents from DR to DC but it fails. In journaling mechanism, it deletes the entire volume and recreates it afresh which does not solve our problem. 2. How does incremental replication work from DR to DC? 3. Does Two-way mirroring help this situation. According to me, in this method, it is for 2 different clouds with 2 different storages and replicating both the clouds workloads? Does Failback work in this scenario ? Please help us / guide us to deploy this solution Regards V.A.Prabha Thanks & Regards, Ms V A Prabha / श्रीमती प्रभा वी ए Joint Director / संयुक्त निदेशक Centre for Development of Advanced Computing(C-DAC) / प्रगत संगणन विकास केन्द्र(सी-डैक) Tidel Park”, 8th Floor, “D” Block, (North &South) / “टाइडल पार्क”,8वीं मंजिल, “डी” ब्लॉक, (उत्तर और दक्षिण) No.4, Rajiv Gandhi Salai / नं.4, राजीव गांधी सलाई Taramani / तारामणि Chennai / चेन्नई – 600113 Ph.No.:044-22542226/27 Fax No.: 044-22542294 ------------------------------------------------------------------------------------------------------------ [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email is strictly prohibited and appropriate legal action will be taken. ------------------------------------------------------------------------------------------------------------