Ceph - Tag - Gene.Tech https://geneliu.itaghome.win/tags/ceph/ Ceph - Tag - Gene.Tech Hugo -- gohugo.ioengene.liu@live.com (Gene Liu) gene.liu@live.com (Gene Liu)This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.Tue, 18 Feb 2020 13:57:57 +0000 Ceph Geo-Replication Models https://geneliu.itaghome.win/2020-02-18-ceph-geo-replication-models/ Tue, 18 Feb 2020 13:57:57 +0000 gene.liu@live.com (Gene Liu) https://geneliu.itaghome.win/2020-02-18-ceph-geo-replication-models/ Overview

  1. Ceph implements strong consistency between OSDs according to the replication factor, and reliability/availability according to the placement group (CRUSH MAP).

  2. Clusters utilizing cross-site (a)sync will be performance-compromised and require fat, low-latency pipes, which strongly affects the Ceph RADOS protocol (both on RBD and object storage).

  3. There is no recommendation/solution statement from Ceph upstream (or Red Hat) yet - https://tracker.ceph.com/projects/ceph/wiki/Can_Ceph_Support_Multiple_Data_Centers

  4. It sounds like the team is developing/enhancing a ‘real’ stretch Ceph cluster. (Attachment 2)

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