Hi
Could someone please explain / show how to troubleshoot the space usage in Ceph and how to reclaim the unused space?
I have a small cluster with 40 osds, replica of 2, mainly used as a backend for cloud stack as well as the S3 gateway. The used space doesn't make any sense to me, especially the rgw pool, so I am seeking help.
Here is what I found from the client:
Ceph -s shows the
usage: 89 TiB used, 24 TiB / 113 TiB avail
Ceph df shows:
Primary-ubuntu-1 5 27 TiB 90.11 3.0 TiB 7201098
Primary-ubuntu-1-ssd 57 1.2 TiB 89.62 143 GiB 359260
.rgw.buckets 19 15 TiB 83.73 3.0 TiB 8742222
the usage of the Primary-ubuntu-1 and Primary-ubuntu-1-ssd is in line with my expectations. However, the .rgw.buckets pool seems to be using way too much. The usage of all rgw buckets shows 6.5TB usage (looking at the size_kb values from the "radosgw-admin bucket stats"). I am trying to figure out why .rgw.buckets is using 15TB of space instead of the 6.5TB as shown from the bucket usage.
Thanks
Andrei
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