You might want to read up https://docs.ceph.com/en/pacific/cephfs/multimds/ The page contains info on dir pinning and related policies.
On Thu, Aug 10, 2023 at 12:11 PM Eugen Block <ebl...@nde.ag> wrote: > > Okay, you didn't mention that in your initial question. There was an > interesting talk [3] at the Cephalocon in Amsterdam about an approach > to combine dynamic and static pinning. But I don't know what the > current status is. Regarding tuning options for the existing balancer > I would hope that Gregory or Patrick could chime in here. > > [3] https://www.youtube.com/watch?v=pDURll6Y-Ug > > Zitat von zxcs <zhuxion...@163.com>: > > > Thanks a lot, Eugen! > > > > we are using dynamic subtree pinning, we have another cluster using > > manual pinning, but we have many directory , and we need pin each > > dir for each request. so in our new cluster, we want to try dynamic > > subtree pinning. we don’t want to human kick in every time. Because > > some A directory hot, and sometimes B directory hot.. each directory > > has many subdirectory and sub-subdirectory... > > > > But we found the load not balance on all mds when we using dynamic > > subtree pinning. So we want to know if any config we can tune for > > the dynamic subtree pinning. Thanks again! > > > > Thanks, > > xz > > > >> 2023年8月9日 17:40，Eugen Block <ebl...@nde.ag> 写道： > >> > >> Hi, > >> > >> you could benefit from directory pinning [1] or dynamic subtree > >> pinning [2]. We had great results with manual pinning in an older > >> Nautilus cluster, didn't have a chance to test the dynamic subtree > >> pinning yet though. It's difficult to tell in advance which option > >> would suit best your use-case, so you'll probably have to try. > >> > >> Regards, > >> Eugen > >> > >> [1] > >> https://docs.ceph.com/en/reef/cephfs/multimds/#manually-pinning-directory-trees-to-a-particular-rank > >> [2] > >> https://docs.ceph.com/en/reef/cephfs/multimds/#dynamic-subtree-partitioning-with-balancer-on-specific-ranks > >> > >> Zitat von zxcs <zhuxion...@163.com <mailto:zhuxion...@163.com>>: > >> > >>> Hi, experts, > >>> > >>> we have a product env build with ceph version 16.2.11 pacific, > >>> and using CephFS. > >>> Also enable multi active mds(more than 10), but we usually see > >>> load unbalance on our client request with these mds. > >>> see below picture. the top 1 mds has 32.2k client request. and the > >>> last one only 331. > >>> > >>> this always lead our cluster into very bad situation. say many MDS > >>> report slow requests… > >>> ... > >>> 7 MDSs report slow requests > >>> 1 MDSs behind on trimming > >>> … > >>> > >>> > >>> So our question is how to set those mdss load balance? Could any > >>> one please help to shed some light here? > >>> Thanks a ton! > >>> > >>> > >>> Thanks, > >>> xz > >>> > >>> _______________________________________________ > >>> ceph-users mailing list -- ceph-users@ceph.io <mailto:ceph-users@ceph.io> > >>> To unsubscribe send an email to ceph-users-le...@ceph.io > >>> <mailto:ceph-users-le...@ceph.io> > >> > >> > >> _______________________________________________ > >> ceph-users mailing list -- ceph-users@ceph.io <mailto:ceph-users@ceph.io> > >> To unsubscribe send an email to ceph-users-le...@ceph.io > >> <mailto:ceph-users-le...@ceph.io> > > > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io -- Milind _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
