Hi all,
I have a cluster with 116 disks (24 new disks of 16TB added in december
and the rest of 8TB) running nautilus 14.2.16.
I moved (8 month ago) from crush_compat to upmap balancing.
But the cluster seems not well balanced, with a number of pgs on the 8TB
disks varying from 26 to 52 ! And an occupation from 35 to 69%.
The recent 16 TB disks are more homogeneous with 48 to 61 pgs and space
between 30 and 43%.
Last week, I realized that some osd were maybe not using upmap because I
did a ceph osd crush weight-set ls and got (compat) as result.
Thus I ran a ceph osd crush weight-set rm-compat which triggered some
rebalancing. Now there is no more recovery for 2 days, but the cluster
is still unbalanced.
As far as I understand, upmap is supposed to reach an equal number of
pgs on all the disks (I guess weighted by their capacity).
Thus I would expect more or less 30 pgs on the 8TB disks and 60 on the
16TB and around 50% usage on all. Which is not the case (by far).
The problem is that it impact the free available space in the pools
(264Ti while there is more than 578Ti free in the cluster) because free
space seems to be based on space available before the first osd will be
full !
Is it normal ? Did I missed something ? What could I do ?
F.
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