I mean it seemed fine for the current master branch ran under kernel 2.6.32 but I can't make sure that no other problem because no production verify. On Tue, Feb 3, 2015 at 12:21 AM, Haomai Wang <haomaiwang@xxxxxxxxx> wrote: > 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 -- Best Regards, Wheat _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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