On Tue, Aug 16, 2016 at 10:46:37AM +0200, Ilya Dryomov wrote: > On Tue, Aug 16, 2016 at 4:06 AM, Chengwei Yang > <chengwei.yang.cn@xxxxxxxxx> wrote: > > On Mon, Aug 15, 2016 at 03:27:50PM +0200, Ilya Dryomov wrote: > >> On Mon, Aug 15, 2016 at 9:54 AM, Chengwei Yang > >> <chengwei.yang.cn@xxxxxxxxx> wrote: > >> > Hi List, > >> > > >> > I read from ceph document[1] that there are several rbd image features > >> > > >> > - layering: layering support > >> > - striping: striping v2 support > >> > - exclusive-lock: exclusive locking support > >> > - object-map: object map support (requires exclusive-lock) > >> > - fast-diff: fast diff calculations (requires object-map) > >> > - deep-flatten: snapshot flatten support > >> > - journaling: journaled IO support (requires exclusive-lock) > >> > > >> > But I didn't found any document/blog/google tells these features supported since > >> > which kernel version. > >> > >> No released kernel currently supports these features. exclusive-lock > >> is staged for 4.9, we are working on staging object-map and fast-diff. > > > > Thanks Ilya > > > > Since object-map, fast-diff, journaling are depend on exclusive-lock, so I > > expect them will be available after exclusive-lock. > > > > And I verified that layering is supported fine by centos kernel 3.10.0-327 while > > neither striping nor deep-flatten is supported, do you know which valina kernel > > version start to supported rbd striping and deep-flatten? > > Right, I should have been more specific - layering has been supported > for a long time (3.10+), so I crossed it off. > > None of the features except layering are currenty supported by the > kernel client. It will let you map an image with the striping feature > enabled, but only if stripe_unit == object_size and stripe_count == 1 > (the default striping pattern). > > exclusive-lock, object-map and fast-diff are being worked on. > striping, deep-flatten and journaling are farther away. Thanks Ilya, much appreciate! > > Thanks, > > Ilya -- Thanks, Chengwei
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