Hello ceph-users, we are using a low number of rbd.ko clients with our luminous cluster. Where can i get information about the following questions: * Which features and cluster compatibility is provided by the rbd.ko module of my system? (/sys/module/rbd/**, "modinfo rbd" not seems to provide to provide useful information on Ubuntu 16.04/18.04) * Ubuntu 16.04/18.04 (kernel 4.15) /sys/bus/rbd/supported_features lists feature compatibility 0x187 Is there a convenient way to find out whats provided with that kernel? * Is there a overview for kernel releases for features and cluster compatibility? -> i.e. which kernel version is needed to use the fast-diff feature * What is the development-roadmap for features and cluster compatibility in rbd.ko? * Available documentation http://docs.ceph.com/docs/luminous/rbd/rbd-ko/ and https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/ABI/testing/sysfs-bus-rbd?h=v4.20.5 do not provide any significant information regarding the described questions. Did i missed important information resources? Best regards Marc _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com