On Wed, Nov 20, 2024 at 2:05 PM Rajmohan Ramamoorthy <ram.rajmoh...@gmail.com> wrote: > > Hi Patrick, > > Few other follow up questions. > > Is directory fragmentation applicable only when multiple active MDS is > enabled for a Ceph FS?
It has no effect when applied with only one rank (active). It can be useful to have it already set in case you increase max_mds. > Will directory fragmenation and distribution of fragments amongs active MDS > happen if we turn off balancer for a Ceph FS volume `ceph fs set midline-a > balance_automate false` ? In Squide, the CephFS automatic metadata load > (sometimes called “default”) balancer is now disabled by default. > (https://docs.ceph.com/en/latest/releases/squid/) Yes. > Is there a way for us to ensure that the directory tree of a Subvolume > (Kubernetes PV) is part of a same fragment and handled by a single MDS so > that a client operations are handled by one MDS? A subvolume would not be split across two MDS. > What is the trigger to start fragmenting directories within a Subvolumegroup? You don't need to do anything more than set the distribute ephemeral pin. > With the `balance_automate` set to false and `ephemeral distributed pin` > enabled for a Subvolumegroup, can we expect (almost) equal distribution of > Subvolumes (Kubernetes PVs) amongst the active MDS daemons and stable > operation without hotspot migrations? Yes. -- Patrick Donnelly, Ph.D. He / Him / His Red Hat Partner Engineer IBM, Inc. GPG: 19F28A586F808C2402351B93C3301A3E258DD79D _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
