Hi Jason, I've followed your steps and now I can list all available data blocks of my image, but I don't know how rebuild a sparse image, I found this script ( https://raw.githubusercontent.com/smmoore/ceph/master/rbd_restore.sh) and https://www.sebastien-han.fr/blog/2015/01/29/ceph-recover-a-rbd-image-from-a-dead-cluster/ but I don't know if this can help me.
Any suggestions? Thanks. 2016-09-21 22:35 GMT+02:00 Jason Dillaman <jdill...@redhat.com>: > Unfortunately, it sounds like the image's header object was lost > during your corruption event. While you can manually retrieve the > image data blocks from the cluster, undoubtedly many might be lost > and/or corrupted as well. > > You'll first need to determine the internal id of your image: > $ rados --pool images getomapval rbd_directory > name_07e54256-d123-4e61-a23a-7f8008340751 > value (16 bytes) : > 00000000 0c 00 00 00 31 30 31 34 31 30 39 63 66 39 32 65 > |....1014109cf92e| > 00000010 > > In my example above, the image id (1014109cf92e in this case) is the > string starting after the first four bytes (the id length). I can then > use the rados tool to list all available data blocks: > > $ rados --pool images ls | grep rbd_data.1014109cf92e | sort > rbd_data.1014109cf92e.0000000000000000 > rbd_data.1014109cf92e.000000000000000b > rbd_data.1014109cf92e.0000000000000010 > > The sequence of hex numbers at the end of each data object is the > object number and it represents the byte offset within the image (4MB > * object number = byte offset assuming default 4MB object size and no > fancy striping enabled). > > You should be able to script something up to rebuild a sparse image > with whatever data is still available in your cluster. > > On Wed, Sep 21, 2016 at 11:12 AM, Fran Barrera <franbarre...@gmail.com> > wrote: > > Hello, > > > > I have a Ceph Jewel cluster with 4 osds and only one monitor integrated > with > > Openstack Mitaka. > > > > Two OSD were down, with a service restart one of them was recovered. The > > cluster began to recover and was OK. Finally the disk of the other OSD > was > > corrupted and the solution was a format and recreate the OSD. > > > > Now I have the cluster OK, but the problem now is with some of the images > > stored in Ceph. > > > > $ rbd list -p images|grep 07e54256-d123-4e61-a23a-7f8008340751 > > 07e54256-d123-4e61-a23a-7f8008340751 > > > > $ rbd export -p images 07e54256-d123-4e61-a23a-7f8008340751 > /tmp/image.img > > 2016-09-21 17:07:00.889379 7f51f9520700 -1 librbd::image::OpenRequest: > > failed to retreive immutable metadata: (2) No such file or directory > > rbd: error opening image 07e54256-d123-4e61-a23a-7f8008340751: (2) No > such > > file or directory > > > > Ceph can list the image but nothing more, for example an export. So > > Openstack can not retrieve this image. I try repair the pg but appear's > ok. > > Is there any solution for this? > > > > Kind Regards, > > Fran. > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > Jason >
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