Description of problem:
Currently when a legacy cluster is upgraded to Luminous (RHCS 3.y) and CRUSH device classes are enabled CRUSH will rebalance data in the cluster due to a change in the CRUSH map.
Reclassifying devices should not incur a data movement as we are only applying a label.
Version-Release number of selected component (if applicable):
I am finalizing a tool to handle this in https://github.com/ceph/ceph/pull/24502
*** Bug 1638228 has been marked as a duplicate of this bug. ***
Created attachment 1496814 [details]
updated crush map
Updated CRUSH map that uses hdd-sas and hdd-sata classes. All mappings should be identical to before (no PGs should move).
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.