Hi! The program is in attachment. WARNING: USE IN AT YOUR OWN RISK, NO WARRANTIES ARE PROVIDED!!! IT MAY CORRUPT YOUR DATA!!! You need to install rados-dev and compile the program with: gcc ./upd_parent.c -o upd_parent -lrados To change ID of parent image pool you need to run it with following arguments: ./upd_parent <old_wrong_pool_id> <new_correct_pool_id> <image_pool_name> <image_name> for example (lost pool was 13, new pool is 20, image pool name is "volumes"): ./upd_parent 13 20 volumes volume-c083800d-7688-4fb8-9230-83643cbe8927 Hope, it will helps. I recommend you to try to mount fixed image read-only, copy all important data (if possible) and only after that try to boot it or run fsck. Pavel.
Attachment:
upd_parent.c
Description: Binary data
> 16 мая 2015 г., в 7:13, Tuomas Juntunen <tuomas.juntunen@xxxxxxxxxxxxxxx> написал(а): > > Hey Pavel > > Could you share your C program and the process how you were able to fix the images. > > Thanks > > Tuomas > > -----Original Message----- > From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Pavel V. Kaygorodov > Sent: 13. toukokuuta 2015 18:24 > To: Jason Dillaman > Cc: ceph-users > Subject: Re: RBD images -- parent snapshot missing (help!) > > Hi! > > Thank you for you effort, I think it will be very useful for many people! > Now I have solved the problem, using C program and radios library, 2 images from 3 is completely restored, one was corrupted, but I have rescued all important data :) > > Pavel. > > > >> 13 мая 2015 г., в 17:20, Jason Dillaman <dillaman@xxxxxxxxxx> написал(а): >> >> 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-develo >> pment >> >> -- >> >> 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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