[ceph-users] Multi Active MDS on old kernel client (<4.14)

Hello! The documentation on kernel client features states: "The feature has been supported since the Luminous release. It is recommended to use Linux kernel clients >= 4.14 when there are multiple active MDS." My question is: what is the actual impact of using an old (3.10) client with a multi-mds FS? I used a 3.10 client to do some reads and writes of metadata pinned to different MDSs, and it all ostensibly worked fine. Is it purely a performance problem? Or is there a more serious issue lurking that my simple tests would not reveal. Thanks! *Jesse Galley* *Director, Mail Platform & Migrations, Hostopia* *C: 416.816.0866* *jesse.galley@hostpapa.com <jesse.galley@hostpapa.com>*