On 07/24/2018 12:58 PM, Martin Overgaard Hansen wrote: > Creating a compat weight set manually with 'ceph osd crush weight-set > create-compat' gives me: Error EPERM: crush map contains one or more > bucket(s) that are not straw2 > > What changes do I need to implement to get the mgr balancer plugin > working? Thank.
You will need to run osd crush set-all-straw-buckets-to-straw2 which exists since ceph mimic v13.0.1 as a handy shortcut to upgrade to straw2. The switch of the straw alorithm to the improved straw2 was introduced with hammer, but before this command you would have had to edit the crush map by hand. http://docs.ceph.com/docs/master/rados/operations/crush-map/ There is a new bucket type (straw2) supported. The new straw2 bucket type fixes several limitations in the original straw bucket. Specifically, the old straw buckets would change some mappings that should have changed when a weight was adjusted, while straw2 achieves the original goal of only changing mappings to or from the bucket item whose weight has changed. straw2 is the default for any newly created buckets. Migration impact: Changing a bucket type from straw to straw2 will result in a reasonably small amount of data movement, depending on how much the bucket item weights vary from each other. When the weights are all the same no data will move, and when item weights vary significantly there will be more movement. Best, Lothar -- Lothar Gesslein Linux Consultant B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537
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