> Having your journals on the same disk causes all data to be written twice, 
> i.e.
> once to the journal and once to the
> osd store.  Notice that your tested throughput is slightly more than half your
> expected maximum...

But AFAIK OSD bench already considers journal writes. The disk can write about 
100MB/s, so
55MB/s is already half speed!

So that does not explain the behavior for me.


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