Description of problem: Customers are looking to use the upmap feature as a way to rebalance their clusters and also for cluster expansions to be less painful. We currently do not test the upmap feature outside of the ceph-mgr balancer and this would be required to support use of upmap for manual migrations of PG's to other OSD's. Version-Release number of selected component (if applicable): RHCS 4 How reproducible: Request for QE to test utilizing upmap for manual balancing of PG's
Here are the presentations from Ceph Day Berlin by CERN and Cephalocon Barcelona by UK Research that addresses uses and improvements using the upmap feature which customers are referring to. UK Research: https://static.sched.com/hosted_files/cephalocon2019/39/CRUSHing_the_OSD_variance_problem.pdf CERN: https://www.slideshare.net/Inktank_Ceph/ceph-day-berlin-mastering-ceph-operations-upmap-and-the-mgr-balancer
*** Bug 1751131 has been marked as a duplicate of this bug. ***
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2020:2231