[ceph-users] how to improve performance

ulembke at polarzone.de ulembke at polarzone.de
Mon Nov 20 04:02:16 PST 2017


Hi Rudi,

Am 2017-11-20 11:58, schrieb Rudi Ahlers:
> ...
> 
> Some more stats:
> 
> root at virt2:~# rados bench -p Data 10 seq
> hints = 1
>   sec Cur ops   started  finished  avg MB/s  cur MB/s last lat(s)  avg
> lat(s)
>     0       0         0         0         0         0           -
>  0
>     1      16       402       386   1543.69      1544  0.00182802
>  0.0395421
>     2      16       773       757   1513.71      1484  0.00243911
>  0.0409455
> 
this values are due cached osd-data on your osd-nodes.

If you flush your cache (on all osd-nodes), your reads will be much 
worse, because they came from the HDDs.


Udo


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