Hello Adam! Thank you very much for your advice, I will try setting the tunables to 'firefly'.
As there seem to be a few features which would require the 4.1 kernel... is there any 'advised' Linux distribution on which Ceph is known to work best? According to this <http://docs.ceph.com/docs/master/start/os-recommendations/> page... it seems to be most tested on Ubuntu 14.04 and CentOS 7, although both are on the 3.1x kernel. Sorry if this topic was previously discussed, I might have missed it. Thank you! Regards, Bogdan On Mon, Nov 9, 2015 at 7:55 AM, Adam Tygart <mo...@ksu.edu> wrote: > The problem is that "hammer" tunables (i.e. "optimal" in v0.94.x) are > incompatible with the kernel interfaces before Linux 4.1 (namely due > to straw2 buckets). To make use of the kernel interfaces in 3.13, I > believe you'll need "firefly" tunables. > > -- > Adam > > On Sun, Nov 8, 2015 at 11:48 PM, Bogdan SOLGA <bogdan.so...@gmail.com> > wrote: > > Hello Greg! > > > > Thank you for your advice, first of all! > > > > I have tried to adjust the Ceph tunables detailed in this page, but > without > > success. I have tried both 'ceph osd crush tunables optimal' and 'ceph > osd > > crush tunables hammer', but both lead to the same 'feature set mismatch' > > issue, whenever I tried to create a new RBD image, afterwards. The only > way > > I could restore the proper functioning of the cluster was to set the > > tunables to default ('ceph osd crush tunables default'), which are the > > default values for a new cluster. > > > > So... either I'm doing something incompletely, or I'm doing something > wrong. > > Any further advice on how to be able to use EC pools is highly welcomed. > > > > Thank you! > > > > Regards, > > Bogdan > > > > > > On Mon, Nov 9, 2015 at 12:20 AM, Gregory Farnum <gfar...@redhat.com> > wrote: > >> > >> With that release it shouldn't be the EC pool causing trouble; it's the > >> CRUSH tunables also mentioned in that thread. Instructions should be > >> available in the docs for using older tunable that are compatible with > >> kernel 3.13. > >> -Greg > >> > >> > >> On Saturday, November 7, 2015, Bogdan SOLGA <bogdan.so...@gmail.com> > >> wrote: > >>> > >>> Hello, everyone! > >>> > >>> I have recently created a Ceph cluster (v 0.94.5) on Ubuntu 14.04.3 > and I > >>> have created an erasure coded pool, which has a caching pool in front > of it. > >>> > >>> When trying to map RBD images, regardless if they are created in the > rbd > >>> or in the erasure coded pool, the operation fails with 'rbd: map > failed: (5) > >>> Input/output error'. Searching the internet for a solution... I came > across > >>> this page, which seems to detail exactly the same issue - a > >>> 'misunderstanding' between erasure coded pools and the 3.13 kernel > (used by > >>> Ubuntu). > >>> > >>> Can you please advise on a fix for that issue? As we would prefer to > use > >>> erasure coded pools, the only solutions which came into my mind were: > >>> > >>> upgrade to the Infernalis Ceph release, although I'm not sure the issue > >>> is fixed in that version; > >>> > >>> upgrade the kernel (on all the OSDs and Ceph clients) to the 3.14+ > >>> kernel; > >>> > >>> Any better / easier solution is highly appreciated. > >>> > >>> Regards, > >>> > >>> Bogdan > > > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > >
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