Thanks Dan!
Thanks,
Mike Dawson
On 4/17/2014 4:06 AM, Dan van der Ster wrote:
Mike Dawson wrote:
Dan,
Could you describe how you harvested and analyzed this data? Even
better, could you share the code?
Cheers,
Mike
First enable debug_filestore=10, then you'll see logs like this:
2014-04-1
Christian Balzer wrote:
> I'm trying to understand that distribution, and the best explanation
> I've come up with is that these are ext4/xfs metadata updates,
> probably atime updates. Based on that theory, I'm going to test
> noatime on a few VMs and see if I notice a change in the distribu
Mike Dawson wrote:
Dan,
Could you describe how you harvested and analyzed this data? Even
better, could you share the code?
Cheers,
Mike
First enable debug_filestore=10, then you'll see logs like this:
2014-04-17 09:40:34.466749 7fb39df16700 10
filestore(/var/lib/ceph/osd/osd.0) write
4.2
Hi,
Gregory Farnum wrote:
I forget which clients you're using — is rbd caching enabled?
Yes, the clients are qemu-kvm-rhev with latest librbd from dumpling and
rbd cache = true.
Cheers, Dan
-- Dan van der Ster || Data & Storage Services || CERN IT Department --
___
--Original Message-
From: ceph-users-boun...@lists.ceph.com
[mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Christian Balzer
Sent: Wednesday, April 16, 2014 5:43 PM
To: Dan van der Ster
Cc: ceph-users@lists.ceph.com
Subject: Re: [ceph-users] RBD write access patterns and atime
On Wed,
On Wed, 16 Apr 2014 17:08:09 +0200 Dan van der Ster wrote:
> Dear ceph-users,
>
> I've recently started looking through our FileStore logs to better
> understand the VM/RBD IO patterns, and noticed something interesting.
> Here is a snapshot of the write lengths for one OSD server (with 24
> O
On 04/16/2014 12:14 PM, Gregory Farnum wrote:
On Wed, Apr 16, 2014 at 8:08 AM, Dan van der Ster
wrote:
Dear ceph-users,
I've recently started looking through our FileStore logs to better
understand the VM/RBD IO patterns, and noticed something interesting. Here
is a snapshot of the write lengt
Dan,
Could you describe how you harvested and analyzed this data? Even
better, could you share the code?
Cheers,
Mike
On 4/16/2014 11:08 AM, Dan van der Ster wrote:
Dear ceph-users,
I've recently started looking through our FileStore logs to better
understand the VM/RBD IO patterns, and not
On Wed, Apr 16, 2014 at 8:08 AM, Dan van der Ster
wrote:
> Dear ceph-users,
>
> I've recently started looking through our FileStore logs to better
> understand the VM/RBD IO patterns, and noticed something interesting. Here
> is a snapshot of the write lengths for one OSD server (with 24 OSDs) --
