From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Subject: Re: speedup ceph / scaling / find the bottleneck
Date: Mon, 02 Jul 2012 08:12:59 +0200
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References: <59beaaec-5f12-4fb2-9c03-69f41849e89e@mailpro>
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To: Alexandre DERUMIER <aderumier@odiso.com>
Cc: Sage Weil <sage@inktank.com>, ceph-devel@vger.kernel.org, Mark Nelson <mark.nelson@inktank.com>

Am 02.07.2012 07:02, schrieb Alexandre DERUMIER:
> Hi,
> my 2cent,
> maybe with lower range (like 100MB) of random io,
> you have more chance to aggregate them in 4MB block ?

Yes maybe. If you have just a range of 100MB the chance you'll hit the 
same 4MB block again is very high.

@sage / mark
How does the aggregation work? Does it work 4MB blockwise or target node 
based?

Greets
Stefan