You can also mount the rbd with the discard option. It works the same way as you would mount an ssd to free up the space when you delete things. I use the discard option on my ext4 rbds on Ubuntu and it frees up the used Ceph space immediately.
Sent from my iPhone On May 19, 2016, at 12:30 PM, Albert Archer <albertarche...@gmail.com<mailto:albertarche...@gmail.com>> wrote: Thank you for your great support . Best Regards Albert On Thu, May 19, 2016 at 10:41 PM, Udo Lembke <ulem...@polarzone.de<mailto:ulem...@polarzone.de>> wrote: Hi Albert, to free unused space you must enable trim (or do an fstrim) in the vm - and all things in the storage chain must support this. The normal virtio-driver don't support trim, but if you use scsi-disks with virtio-scsi-driver you can use it. Work well but need some time for huge filesystems. Udo On 19.05.2016 19:58, Albert Archer wrote: Hello All. I am newbie in ceph. and i use jewel release for testing purpose. it seems every thing is OK, HEALTH_OK , all of OSDs are in UP and IN state. I create some RBD images (rbd create .... ) and map to some ubuntu host . I can read and write data to my volume , but when i delete some content from volume (e,g some huge files,...), populated capacity of cluster does not free and None of objects were clean. what is the problem ??? Regards [https://ssl.gstatic.com/ui/v1/icons/mail/images/cleardot.gif]Albert _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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