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

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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