Do can you do HA on the NFS shares? On Wed, Jan 30, 2019 at 9:10 AM David C <dcsysengin...@gmail.com> wrote:
> Hi Patrick > > Thanks for the info. If I did multiple exports, how does that work in > terms of the cache settings defined in ceph.conf, are those settings per > CephFS client or a shared cache? I.e if I've definied client_oc_size, would > that be per export? > > Cheers, > > On Tue, Jan 15, 2019 at 6:47 PM Patrick Donnelly <pdonn...@redhat.com> > wrote: > >> On Mon, Jan 14, 2019 at 7:11 AM Daniel Gryniewicz <d...@redhat.com> >> wrote: >> > >> > Hi. Welcome to the community. >> > >> > On 01/14/2019 07:56 AM, David C wrote: >> > > Hi All >> > > >> > > I've been playing around with the nfs-ganesha 2.7 exporting a cephfs >> > > filesystem, it seems to be working pretty well so far. A few >> questions: >> > > >> > > 1) The docs say " For each NFS-Ganesha export, FSAL_CEPH uses a >> > > libcephfs client,..." [1]. For arguments sake, if I have ten top level >> > > dirs in my Cephfs namespace, is there any value in creating a separate >> > > export for each directory? Will that potentially give me better >> > > performance than a single export of the entire namespace? >> > >> > I don't believe there are any advantages from the Ceph side. From the >> > Ganesha side, you configure permissions, client ACLs, squashing, and so >> > on on a per-export basis, so you'll need different exports if you need >> > different settings for each top level directory. If they can all use >> > the same settings, one export is probably better. >> >> There may be performance impact (good or bad) with having separate >> exports for CephFS. Each export instantiates a separate instance of >> the CephFS client which has its own bookkeeping and set of >> capabilities issued by the MDS. Also, each client instance has a >> separate big lock (potentially a big deal for performance). If the >> data for each export is disjoint (no hard links or shared inodes) and >> the NFS server is expected to have a lot of load, breaking out the >> exports can have a positive impact on performance. If there are hard >> links, then the clients associated with the exports will potentially >> fight over capabilities which will add to request latency.) >> >> -- >> Patrick Donnelly >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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