Re: handling different disk sizes

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Hi Félix,

Could you please send me the output of the "ceph report" command (privately, the output is likely too big for the list) ? I suspect what you're seeing is because the smaller disks have more PGs than they should for the default.rgw.buckets.data pool. With the output of "ceph report" and using python-crush[1] we'll be able to verify that.

Cheers

[1] http://crush.readthedocs.io/

On 06/05/2017 01:54 PM, Félix Barbeira wrote:
> Hi,
> 
> We have a small cluster for radosgw use only. It has three nodes, witch 3 osds each. Each node has different disk sizes:
> 
> node01 : 3x8TB
> node02 : 3x2TB
> node03 : 3x3TB
> 
> I thought that the weight handle the amount of data that every osd receive. In this case for example the node with the 8TB disks should receive more than the rest, right? All of them receive the same amount of data and the smaller disk (2TB) reaches 100% before the bigger ones. Am I doing something wrong?
> 
> The cluster is jewel LTS 10.2.7.
> 
> # ceph osd df
> ID WEIGHT  REWEIGHT SIZE   USE   AVAIL  %USE  VAR  PGS
>  0 7.27060  1.00000  7445G 1012G  6432G 13.60 0.57 133
>  3 7.27060  1.00000  7445G 1081G  6363G 14.52 0.61 163
>  4 7.27060  1.00000  7445G  787G  6657G 10.58 0.44 120
>  1 1.81310  1.00000  1856G 1047G   809G 56.41 2.37 143
>  5 1.81310  1.00000  1856G  956G   899G 51.53 2.16 143
>  6 1.81310  1.00000  1856G  877G   979G 47.24 1.98 130
>  2 2.72229  1.00000  2787G 1010G  1776G 36.25 1.52 140
>  7 2.72229  1.00000  2787G  831G  1955G 29.83 1.25 130
>  8 2.72229  1.00000  2787G 1038G  1748G 37.27 1.56 146
>               TOTAL 36267G 8643G 27624G 23.83
> MIN/MAX VAR: 0.44/2.37  STDDEV: 18.60
> #
> 
> # ceph osd tree
> ID WEIGHT   TYPE NAME      UP/DOWN REWEIGHT PRIMARY-AFFINITY
> -1 35.41795 root default
> -2 21.81180     host node01
>  0  7.27060         osd.0       up  1.00000          1.00000
>  3  7.27060         osd.3       up  1.00000          1.00000
>  4  7.27060         osd.4       up  1.00000          1.00000
> -3  5.43929     host node02
>  1  1.81310         osd.1       up  1.00000          1.00000
>  5  1.81310         osd.5       up  1.00000          1.00000
>  6  1.81310         osd.6       up  1.00000          1.00000
> -4  8.16687     host node03
>  2  2.72229         osd.2       up  1.00000          1.00000
>  7  2.72229         osd.7       up  1.00000          1.00000
>  8  2.72229         osd.8       up  1.00000          1.00000
> #
> 
> # ceph -s
>     cluster 49ba9695-7199-4c21-9199-ac321e60065e
>      health HEALTH_OK
>      monmap e1: 3 mons at {ceph-mon01=[x:x:x:x:x:x:x:x]:6789/0,ceph-mon02=[x:x:x:x:x:x:x:x]:6789/0,ceph-mon03=[x:x:x:x:x:x:x:x]:6789/0}
>             election epoch 48, quorum 0,1,2 ceph-mon01,ceph-mon03,ceph-mon02
>      osdmap e265: 9 osds: 9 up, 9 in
>             flags sortbitwise,require_jewel_osds
>       pgmap v95701: 416 pgs, 11 pools, 2879 GB data, 729 kobjects
>             8643 GB used, 27624 GB / 36267 GB avail
>                  416 active+clean
> #
> 
> # ceph osd pool ls
> .rgw.root
> default.rgw.control
> default.rgw.data.root
> default.rgw.gc
> default.rgw.log
> default.rgw.users.uid
> default.rgw.users.keys
> default.rgw.buckets.index
> default.rgw.buckets.non-ec
> default.rgw.buckets.data
> default.rgw.users.email
> #
> 
> # ceph df
> GLOBAL:
>     SIZE       AVAIL      RAW USED     %RAW USED
>     36267G     27624G        8643G         23.83
> POOLS:
>     NAME                           ID     USED      %USED     MAX AVAIL     OBJECTS
>     .rgw.root                      1       1588         0         5269G           4
>     default.rgw.control            2          0         0         5269G           8
>     default.rgw.data.root          3       8761         0         5269G          28
>     default.rgw.gc                 4          0         0         5269G          32
>     default.rgw.log                5          0         0         5269G         127
>     default.rgw.users.uid          6       4887         0         5269G          28
>     default.rgw.users.keys         7        144         0         5269G          16
>     default.rgw.buckets.index      9          0         0         5269G          14
>     default.rgw.buckets.non-ec     10         0         0         5269G           3
>     default.rgw.buckets.data       11     2879G     35.34         5269G      746848
>     default.rgw.users.email        12        13         0         5269G           1
> #
> 
> -- 
> Félix Barbeira.
> 
> 
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> 

-- 
Loïc Dachary, Artisan Logiciel Libre
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