What is a "dirty" object

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Hi,

With my testing cluster (Hammer on Ubuntu 14.04), I have this:

----------------------------------------------------------
~# ceph df detail
GLOBAL:
    SIZE      AVAIL     RAW USED     %RAW USED     OBJECTS 
    4073G     3897G         176G          4.33       23506 
POOLS:
    NAME                   ID     CATEGORY     USED       %USED     MAX AVAIL     OBJECTS     DIRTY     READ     WRITE 
    data                   0      -            20579M      0.49         1934G        6973      6973     597k     2898k 
    metadata               1      -            81447k         0         1934G          53        53      243      135k 
    volumes                3      -            56090M      1.34         1934G       14393     14393     208k     2416k 
    images                 4      -            12194M      0.29         1934G        1551      1551     6263      5912 
    .rgw.buckets           13     -              362M         0         1934G         445       445     9244     14954 
    .users                 25     -                26         0         1934G           3         3        0         3 
    .users.email           26     -                26         0         1934G           3         3        0         3 
    .users.uid             27     -              1059         0         1934G           6         6       12         6 
    .rgw.root              28     -               840         0         1934G           3         3       63         3 
    .rgw.control           29     -                 0         0         1934G           8         8        0         8 
    .rgw.buckets.extra     30     -                 0         0         1934G           8         8        0         8 
    .rgw.buckets.index     31     -                 0         0         1934G          11        11        0        11 
    .rgw.gc                32     -                 0         0         1934G          32        32        0        32 
    .rgw                   33     -              3064         0         1934G          17        17        0        17 
----------------------------------------------------------

If I understand well, all objects in the cluster are "dirty".
Is it normal?
What is a "dirty" object?

Thanks for your help.

-- 
François Lafont
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