Re: Ceph RBD bench has a strange behaviour when RBD client caching is active

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Correct -- it was a bug in 'rbd bench-write' only.  

-- 

Jason Dillaman 


----- Original Message -----
> From: "J-P Methot" <jpmethot@xxxxxxxxxx>
> To: "Jason Dillaman" <dillaman@xxxxxxxxxx>
> Cc: ceph-users@xxxxxxxxxxxxxx
> Sent: Monday, January 25, 2016 2:10:19 PM
> Subject: Re:  Ceph RBD bench has a strange behaviour when RBD client caching is active
> 
> Ceph package is 0.94.5, which is hammer. So yes it could very well be
> this bug. Must I assume then that it only affects rbd bench and not the
> general functionality of the client?
> 
> 
> 
> On 2016-01-25 1:59 PM, Jason Dillaman wrote:
> > What release are you testing?  You might be hitting this issue [1] where
> > 'rbd bench-write' would issue the same IO request repeatedly.  With
> > writeback cache enabled, this would result in virtually no ops issued to
> > the backend.
> > 
> > [1] http://tracker.ceph.com/issues/14283
> > 
> 
> 
> --
> ======================
> Jean-Philippe Méthot
> Administrateur système / System administrator
> GloboTech Communications
> Phone: 1-514-907-0050
> Toll Free: 1-(888)-GTCOMM1
> Fax: 1-(514)-907-0750
> jpmethot@xxxxxxxxxx
> http://www.gtcomm.net
> 
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