On 06/19/15 13:42, Burkhard Linke wrote: > > Forget the reply to the list... > > -------- Forwarded Message -------- > Subject: Re: [ceph-users] Unexpected disk write activity with btrfs OSDs > Date: Fri, 19 Jun 2015 09:06:33 +0200 > From: Burkhard Linke <burkhard.li...@computational.bio.uni-giessen.de> > To: Lionel Bouton <lionel+c...@bouton.name> > > > > Hi, > > On 06/18/2015 11:28 PM, Lionel Bouton wrote: > > Hi, > *snipsnap* > > > - Disks with btrfs OSD have a spike of activity every 30s (2 intervals > > of 10s with nearly 0 activity, one interval with a total amount of > > writes of ~120MB). The averages are : 4MB/s, 100 IO/s. > > Just a guess: > > btrfs has a commit interval which defaults to 30 seconds. > > You can verify this by changing the interval with the commit=XYZ mount > option.
I know and I tested commit intervals of 60 and 120 seconds without any change. As this is directly linked to filestore max sync interval I didn't report this test result. Best regards, Lionel
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