On Fri, Jul 15, 2022 at 1:46 PM Vladimir Brik <vladimir.brik@xxxxxxxxxxxxxxxx> wrote: > > Hello > > When would it be a good idea to use multiple smaller cephfs > filesystems (in the same cluster) instead a big single one > with active-active MDSs? > > I am migrating about 900M files from Lustre to Ceph and I am > wondering if I should use a single file system or two > filesystems. Right now the only significant benefit of using > multiple cephfs filesystems I see is that a metadata scrub > wouldn't take as long. > > Do people have other thoughts about single vs multiple > filesystems? Major consideration points: cost of having multiple MDS running (more memory/cpu used), inability to move files between the two hierarchies without full copies, and straightforward scaling w/ different file systems. Active-active file systems can often function in a similar way with subtree pinning without the drawbacks. -- Patrick Donnelly, Ph.D. He / Him / His Principal Software Engineer Red Hat, Inc. GPG: 19F28A586F808C2402351B93C3301A3E258DD79D _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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