Hi,
I have been curiuos about ceph for long time and now I started to
experiment to find out, how it works. The idea I like most is, that ceph
can provide growing storage without the need to move from storage x to
storage y on consumer side.
I started with a 3 node cluster where each node got one OSD (2x 500GB,
1x 1TB). I created the pool and the filesystem, mounted the filesystem
and filled it with data. All three OSDs filled up evenly and when the
pool reached 70%, I added two 1TB OSDs (each on the node with 500GB).
Now I expected some activity to rebalance the fill level of the OSDs,
but nothing special happened. The new OSDs got some data, but the 500GB
OSDs ran into 95%, the pool reached 100%, everything got stuck with 2
OSDs filled up just 20% and left 80% free space?
I searched the documentation how to initiate the
rebalance/redistribution by hand but was unable to find anything.
Can someone please point me to the docs how I can expand the capacity of
the pool without such problems.
Thanks in advance
Thomas
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