Re: How radosgw works with .rgw pools?

[Marius Vaitiekunas <mariusvaitiekunas@xxxxxxxxx>]

On Tue, Dec 20, 2016 at 3:18 PM, Marius Vaitiekunas <mariusvaitiekunas@xxxxxxxxx> wrote:

Hi Cephers,

Could anybody explain, how rgw works with pools? I don't understand how .rgw.control, .rgw.gc,,  .rgw.buckets.index pools could be 0 size, but also have some objects?

# ceph df detail

GLOBAL:

    SIZE     AVAIL     RAW USED     %RAW USED     OBJECTS 

    507T      190T         316T         62.49      42285k 

POOLS:

    NAME                           ID     CATEGORY     QUOTA OBJECTS     QUOTA BYTES     USED       %USED     MAX AVAIL     OBJECTS      DIRTY      READ       WRITE      RAW USED 

    .rgw.control                   14     -            N/A               N/A                  0         0        13605G            8          3          0          0            0 

    .rgw.gc                        16     -            N/A               N/A                  0         0        13605G          512        492       365M       449M            0 

    .rgw.buckets.index             20     -            N/A               N/A                  0         0        13605G          977        977      1593M       743M            0 

If I try to download objects from a .rgw.gc pool with rados -p .rgw.gc get ${object} ${object} , all the objects are zero size. So, how gc process know what should be deleted? 

Thanks!

We found an article, how rgw works with pools:

https://allthenodes.wordpress.com/2016/01/29/how-indexes-work-in-ceph-rados-gateway/

Just in case someone else needs it :)

--

Marius Vaitiekūnas

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