On Thu, Dec 17, 2020 at 3:23 AM Stefan Kooman <stefan@xxxxxx> wrote: > > Hi List, > > In order te reproduce an issue we see on a production cluster (cephFS > client: ceph-fuse outperform kernel client by a factor of 5) we would > like to have a test cluster to have the same cephfs "flags" as > production. However, it's not completely clear how certain features > influence the cephfs flags. What I could find in the source code, > cephfs_features.h, is that it *seems* to correspond to the Ceph release. > For example CEPHFS_FEATURE_NAUTILUS gets a "12" as feature bit. An > upgraded (Luminous -> Mimic -> Nautilus) cephfs gives us the following > cephfs flags: "1c". > > A (newly installed) Nautilus cluster gives "10" when new snapshots are > not allowed (ceph fs set cephfs allow_new_snaps false) and "12" when new > snapshots are allowed (ceph fs set cephfs allow_new_snaps true). file system flags are not the same as the "feature" flags. See this doc for the feature flags: https://docs.ceph.com/en/latest/cephfs/administration/#minimum-client-version Note that the new "fs feature" and "fs required_client_features" commands will be new in Pacific. They provide better control on the exact features you want to require. The old style of specifying the minimum release was inflexible and made it difficult to require specific features the kernel client supports. (For example, the kernel client is only now just about to support "nautilus" because of messenger v2 support.) > We would like to have the test cluster get the "1c" flags and see if we > can reproduce the issue. How can we achieve that? You can't set 0x1c directly. These correspond to reserved feature bits for unspecified older Ceph releases. Suggest you just set the min_compat_client to jewel. In any case, I think what you're asking is about the file system flags and not the required_client_features. -- Patrick Donnelly, Ph.D. He / Him / His Principal Software Engineer Red Hat Sunnyvale, CA GPG: 19F28A586F808C2402351B93C3301A3E258DD79D _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |