2018-03-02 11:21 GMT+01:00 Max Cuttins <m...@phoenixweb.it>: > Hi everybody, > > i deleted everything from the cluster after some test with RBD. > Now I see that there something still in use: > > data: > pools: 0 pools, 0 pgs > objects: 0 objects, 0 bytes > usage: *9510 MB used*, 8038 GB / 8048 GB avail > pgs: > > Is this the overhead of the bluestore journal/wall? > Or there is something wrong and this should be zero? > > > People setting up new clusters also see this, there are overhead items and stuff that eat some space so it would never be zero. At your place, it would seem it is close to 0.1%, so just live with it and move on to using your 8TB for what you really needed it to be used for.
In almost no case will I think that "if only I could get those 0.1% back and then my cluster would be great again". Storage clusters should probably have something like 10% "admin" margins so if ceph warns and whines at OSDs being 85% full, then at 75% you should be writing orders for more disks and/or more storage nodes. At that point, regardless of where the "miscalculation" is, or where ceph manages to waste 9500M while you think it should be zero, it will be all but impossible to make anything decent with it if you were to get those 0.1% back with some magic command. -- May the most significant bit of your life be positive.
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