While certainly that could be a feature that could be added to "rbd info", it will take a while for this feature to reach full use since it would rely on new versions of librbd / krbd. Additionally, access and modified timestamps would require sending out an update notification so that other clients notice the change. You would also want to highly throttle any updates to the modification timestamp -- rendering it a rough approximation of the true last modification time. Finally, a client might not have access to update an image when it opens it read-only --- rendering the last access time, again, as a rough approximation. IMHO, I think there are a lot of other, higher-priority backlog items for RBD (and supporting services) [1] -- but I've added it to the bottom of backlog. [1] https://trello.com/b/ugTc2QFH/ceph-backlog On Fri, Mar 24, 2017 at 3:27 AM, Dongsheng Yang <dongsheng.yang@xxxxxxxxxxxx> wrote: > Hi jason, > > do you think this is a good feature for rbd? > maybe we can implement a "rbd stat" command > to show atime, mtime and ctime of an image. > > Yang > > > On 03/23/2017 08:36 PM, Christoph Adomeit wrote: >> >> Hi, >> >> no i did not enable the journalling feature since we do not use mirroring. >> >> >> On Thu, Mar 23, 2017 at 08:10:05PM +0800, Dongsheng Yang wrote: >>> >>> Did you enable the journaling feature? >>> >>> On 03/23/2017 07:44 PM, Christoph Adomeit wrote: >>>> >>>> Hi Yang, >>>> >>>> I mean "any write" to this image. >>>> >>>> I am sure we have a lot of not-used-anymore rbd images in our pool and I >>>> am trying to identify them. >>>> >>>> The mtime would be a good hint to show which images might be unused. >>>> >>>> Christoph >>>> >>>> On Thu, Mar 23, 2017 at 07:32:49PM +0800, Dongsheng Yang wrote: >>>>> >>>>> Hi Christoph, >>>>> >>>>> On 03/23/2017 07:16 PM, Christoph Adomeit wrote: >>>>>> >>>>>> Hello List, >>>>>> >>>>>> i am wondering if there is meanwhile an easy method in ceph to find >>>>>> more information about rbd-images. >>>>>> >>>>>> For example I am interested in the modification time of an rbd image. >>>>> >>>>> Do you mean some metadata changing? such as resize? >>>>> >>>>> Or any write to this image? >>>>> >>>>> Thanx >>>>> Yang >>>>>> >>>>>> I found some posts from 2015 that say we have to go over all the >>>>>> objects of an rbd image and find the newest mtime put this is not a >>>>>> preferred solution for me. It takes to much time and too many system >>>>>> resources. >>>>>> >>>>>> Any Ideas ? >>>>>> >>>>>> Thanks >>>>>> Christoph >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> ceph-users mailing list >>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>>>> > > -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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