On Thu, Jan 17, 2019 at 2:44 AM Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote: > > On Wed, Jan 16, 2019 at 11:17 PM Patrick Donnelly <pdonnell@xxxxxxxxxx> wrote: > > > > On Wed, Jan 16, 2019 at 1:21 AM Marvin Zhang <fanzier@xxxxxxxxx> wrote: > > > Hi CephFS experts, > > > From document, I know multi-fs within a cluster is still experiment feature. > > > 1. Is there any estimation about stability and performance for this feature? > > > > Remaining blockers [1] need completed. No developer has yet taken on > > this task. Perhaps by O release. > > > > > 2. It seems that each FS will consume at least 1 active MDS and > > > different FS can't share MDS. Suppose I want to create 10 FS , I need > > > at least 10 MDS. Is it right? Is ther any limit number for MDS within > > > a cluster? > > > > No limit on number of MDS but there is a limit on the number of > > actives (multimds). > > TIL... > What is the max number of actives in a single FS? https://github.com/ceph/ceph/blob/39f9e8db4dc7f8bfcb01a9ad20b8961c36138f4f/src/mds/mdstypes.h#L40 I don't think there's a particular reason for this limit. There may be some parts of the code that expect fewer than 256 active MDS but that could probably be easily changed. -- Patrick Donnelly _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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