Hmm, I think there still some buggy exist in 2.6.32. I only try to make write block size align(which already merged into master) but not verify it in production. Our production cluster ran under customize kernel version based on 3.12. On Tue, Feb 3, 2015 at 12:18 AM, J-P Methot <jpmethot@xxxxxxxxxx> wrote: > 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 >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> > > > -- > ====================== > 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 > -- Best Regards, Wheat _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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