If there’s a filesystem on the volume, running fstrim or mounting with the discard option might significantly reduce usage and block count. > On Nov 25, 2023, at 1:02 PM, Tony Liu <tonyliu0592@xxxxxxxxxxx> wrote: > > Thank you Eugen! "rbd du" is it. > The used_size from "rbd du" is object count times object size. > That's the actual storage taken by the image in backend. > > For export, it actually flattens and also sparsifies the image. > In case of many small data pieces, the export size is smaller than du size. > > > Thanks! > Tony > ________________________________________ > From: Eugen Block <eblock@xxxxxx> > Sent: November 25, 2023 12:17 AM > To: ceph-users@xxxxxxx > Subject: Re: easy way to find out the number of allocated objects for a RBD image > > Maybe I misunderstand, but isn’t ’rbd du‘ what you're looking for? > > Zitat von Tony Liu <tonyliu0592@xxxxxxxxxxx>: > >> Hi, >> >> Other than get all objects of the pool and filter by image ID, >> is there any easier way to get the number of allocated objects for >> a RBD image? >> >> What I really want to know is the actual usage of an image. >> An allocated object could be used partially, but that's fine, >> no need to be 100% accurate. To get the object count and >> times object size, that should be sufficient. >> >> "rbd export" exports actual used data, but to get the actual usage >> by exporting the image seems too much. This brings up another >> question, is there any way to know the export size before running it? >> >> >> Thanks! >> Tony >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx > > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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