On Thu, Jan 12, 2017 at 2:41 AM, Ilya Dryomov <idryomov@xxxxxxxxx> wrote: > On Wed, Jan 11, 2017 at 6:01 PM, Shinobu Kinjo <skinjo@xxxxxxxxxx> wrote: >> It would be fine to not support v1 image format at all. >> >> But it would be probably friendly for users to provide them with more >> understandable message when they face feature mismatch instead of just >> displaying: >> >> * rbd: map failed: (6) No such device or address >> >> For instance, show the following something in message: >> >> * Execute rbd feature disable <image-name> >> deep-flatten,fast-diff,object-map,exclusive-lock >> >> or >> >> * Set rbd default features to 3 > > We already do that in jewel: > > $ sudo rbd map a > rbd: sysfs write failed > RBD image feature set mismatch. You can disable features unsupported > by the kernel with "rbd feature disable". > In some cases useful info is found in syslog - try "dmesg | tail" or so. > rbd: map failed: (6) No such device or address > > Enumerating the features to be disabled is hard because that depends on > the version of the rbd.ko module and there is no interface for querying > the feature set. The man page can definitely be improved though: move > --image-feature paragraph into its own section, expand the descriptions > and add kernel version info. I'll put that on my TODO list... That would reasonably make sense. Regards, > > Thanks, > > Ilya -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
