Thank you very much. Also thank you for the presentation you made in
Paris, it was very instructive.
So, from what I understand, the fiemap patch is proven to work on kernel
2.6.32 . The good news is that we use the same kernel in our setup. How
long have your production cluster been running with fiemap set to true?
On 2/2/2015 10:47 AM, Haomai Wang wrote:
There exists a more recently discuss in
PR(https://github.com/ceph/ceph/pull/1665).
On Mon, Feb 2, 2015 at 11:05 PM, J-P Methot <jpmethot@xxxxxxxxxx> wrote:
Hi,
I've been looking into increasing the performance of my ceph cluster for
openstack that will be moved in production soon. It's a full 1TB SSD cluster
with 16 OSD per node over 6 nodes.
As I searched for possible tweaks to implement, I stumbled upon
unitedstack's presentation at the openstack paris summit (video :
https://www.openstack.org/summit/openstack-paris-summit-2014/session-videos/presentation/build-a-high-performance-and-high-durability-block-storage-service-based-on-ceph).
Now, before implementing any of the suggested tweaks, I've been reading up
on each one. It's not that I don't trust everything that's being said there,
but I thought it may be better to inform myself before starting
to implement tweaks that may strongly impact the performance and stability
of my cluster.
One of the suggested tweaks is to set filestore_fiemap to true. The issue
is, after some research, I found that there is a rados block device
corruption bug linked to setting that option to true (link:
http://www.spinics.net/lists/ceph-devel/msg06851.html ). I have not found
any trace of that bug being fixed since, despite the mailing list message
being fairly old.
Is it safe to set filestore_fiemap to true?
Additionally, if anybody feels like watching the video or reading the
presentation (slides are at
http://www.spinics.net/lists/ceph-users/attachments/pdfUlINnd6l8e.pdf ),
what do you think of the part about the other tweaks and the data durability
part?
--
======================
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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--
======================
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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ceph-users mailing list
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