I just pushed an update to the rados CLI that allows the setomapval command to read the data from stdin. In your example below, the command to use would be: # cat ./rbd_header.9a3ab3d1382f3-parent | rados -p volumes setomapval rbd_header.9a3ab3d1382f3 parent The change is currently under review in the wip-rados-binary-omapsetval branch. If you wanted to test it out on a scratch machine, the packages should be available within the next hour or so from the gitbuilder. See the Ceph website for documentation on how to install development packages [1]. [1] http://docs.ceph.com/docs/master/install/get-packages/#add-ceph-development -- Jason Dillaman Red Hat dillaman@xxxxxxxxxx http://www.redhat.com ----- Original Message ----- From: "Pavel V. Kaygorodov" <pasha@xxxxxxxxx> To: "Tuomas Juntunen" <tuomas.juntunen@xxxxxxxxxxxxxxx> Cc: "ceph-users" <ceph-users@xxxxxxxxxxxxxx> Sent: Tuesday, May 12, 2015 3:55:21 PM Subject: Re: RBD images -- parent snapshot missing (help!) Hi! I have found a way to change a pool ID for image parent: list images: # rbd ls volumes 5a4b167d-2588-4c06-904c-347abf91d788_disk.swap volume-0ed965a0-53a5-4054-ad9c-3a432c8455d6 volume-1269b41a-4af0-499b-a16c-9bb6a5b98e70 volume-4094fbc1-9969-47aa-a0de-7026678b8e64 volume-5958295e-9623-4c46-b1e6-2017c6574805 volume-8448a317-d802-48fa-8bc1-ffd4c524fa43 volume-c083800d-7688-4fb8-9230-83643cbe8927 I want to repair volume volume-c083800d-7688-4fb8-9230-83643cbe8927, so get its internal ID: #rados -p volumes get rbd_id.volume-c083800d-7688-4fb8-9230-83643cbe8927 ./image-id #cat ./image-id # hexdump -C image-id 00000000 0d 00 00 00 39 61 33 61 62 33 64 31 33 38 32 66 |....9a3ab3d1382f| 00000010 33 |3| 00000011 So, ID is 9a3ab3d1382f3, get omap key/value pairs: # rados -p volumes listomapvals rbd_header.9a3ab3d1382f3 features value: (8 bytes) : 0000 : 01 00 00 00 00 00 00 00 : ........ object_prefix value: (26 bytes) : 0000 : 16 00 00 00 72 62 64 5f 64 61 74 61 2e 39 61 33 : ....rbd_data.9a3 0010 : 61 62 33 64 31 33 38 32 66 33 : ab3d1382f3 order value: (1 bytes) : 0000 : 17 : . parent value: (46 bytes) : 0000 : 01 01 28 00 00 00 0d 00 00 00 00 00 00 00 0c 00 : ..(............. 0010 : 00 00 38 61 65 63 32 65 37 34 65 62 30 36 22 00 : ..8aec2e74eb06". 0020 : 00 00 00 00 00 00 00 00 00 40 00 00 00 00 : .........@.... size value: (8 bytes) : 0000 : 00 00 00 80 00 00 00 00 : ........ snap_seq value: (8 bytes) : 0000 : 00 00 00 00 00 00 00 00 : ........ we see key "parent", where 0x0d might be an old pool id (13), new one is 20 (0x14), so we can dump this key into file: # rados -p volumes getomapval rbd_header.9a3ab3d1382f3 parent ./rbd_header.9a3ab3d1382f3-parent (length 46) : Writing to ./rbd_header.9a3ab3d1382f3-parent # hexdump -C rbd_header.9a3ab3d1382f3-parent 00000000 01 01 28 00 00 00 0d 00 00 00 00 00 00 00 0c 00 |..(.............| 00000010 00 00 38 61 65 63 32 65 37 34 65 62 30 36 22 00 |..8aec2e74eb06".| 00000020 00 00 00 00 00 00 00 00 00 40 00 00 00 00 |.........@....| 0000002e Here is it! Now we can edit it with hexedit, replacing 0d to 14 and put the value back: # rados -p volumes setomapval rbd_header.9a3ab3d1382f3 parent ........... BUT!!!!! It seems to be impossible to put binary data with zeroes into bash argument, so "rados setomapval" seems to be completely useless in this case. I still need help! Pavel. > 12 мая 2015 г., в 20:54, Tuomas Juntunen <tuomas.juntunen@xxxxxxxxxxxxxxx> написал(а): > > Hi > > I am having this exact same problem, for more than a week. I have not found > a way to do this either. > > Any help would be appreciated. > > Basically all of our guests are now down, even though they are not in > production, we would still need to get the data out of them. > > Br, > Tuomas > > -----Original Message----- > From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of > Pavel V. Kaygorodov > Sent: 12. toukokuuta 2015 20:41 > To: ceph-users > Subject: RBD images -- parent snapshot missing (help!) > > Hi! > > I have an RBD image (in pool "volumes"), made by openstack from parent image > (in pool "images"). > Recently, I have tried to decrease number of PG-s, to avoid new Hammer > warning. > I have copied pool "images" to another pool, deleted original pool and > renamed new pool to "images". Ceph allowed me to do this without any > warning. > But, after a some time my VM-s was stopped and cannot be started again, > because they cannot open volumes, which had parent snapshots on "images" > pool. > I have an original image unchanged, I can made a snapshot if it was not > copied by "radios cppool", but RBD images linked to parent snapshot on pool > with old ID, now this pool has new ID. > So, I need to change the link to parent snapshot for RBD images, or change > pool id of "images" to old one. > How to do this? > > Help, please! > > Pavel. > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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