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. Best regards, Burkhard
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