[ceph-users] how to improve performance

Rudi Ahlers rudiahlers at gmail.com
Mon Nov 20 04:06:47 PST 2017


Hi,

So are you saying this isn't true speed?

Do I just flush the journal and test again? i.e. ceph-osd -i osd.0
--flush-journal && ceph-osd -i osd.2 --flush-journal && ceph-osd -i osd.3
--flush-journal etc, etc?

On Mon, Nov 20, 2017 at 2:02 PM, <ulembke at polarzone.de> wrote:

> 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
>



-- 
Kind Regards
Rudi Ahlers
Website: http://www.rudiahlers.co.za
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