Hi Cephers, I am tuning the pg numbers of my OpenStack pools.
As everyone knows, the pg number of a pool can not be decreased, so I came up with an idea to copy my pools to new pools with lower pg_num and then delete the original pool. I execute following commands: rados cppool volumes new-volumes rados cppool images new-images ceph osd pool rm volumes volumes --yes-i-really-really-mean-it ceph osd pool rm images images --yes-i-really-really-mean-it ceph osd pool rename new-volumes volumes ceph osd pool rename new-images images But after that, when I want to query the usage of volumes by `rbd -p volumes du`, it returns a mass of error messages like 2016-11-20 08:01:47.126068 7fa8337fe700 -1 librbd::image::OpenRequest: failed to retreive name: (2) No such file or directory 2016-11-20 08:01:47.126119 7fa832ffd700 -1 librbd::image::RefreshParentRequest: failed to open parent image: (2) No such file or directory 2016-11-20 08:01:47.126135 7fa832ffd700 -1 librbd::image::RefreshRequest: failed to refresh parent image: (2) No such file or directory 2016-11-20 08:01:47.126150 7fa832ffd700 -1 librbd::image::OpenRequest: failed to refresh image: (2) No such file or directory I think it may be caused by the change of "images" pool id, right? Is it possible to re-reference the rbds in "volumes" on new "images" pool? Or is it possible to change or specify the pool id of new pool? Any suggestions are very welcome. Thanks Sincerely, Craig Chi (Product Developer) Synology Inc. Taipei, Taiwan.
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