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$ get_field() {
> rbd info --format=json $1 | python3 -c "import sys, json; print(json.load(sys.stdin)['$2'])"
> }
Write to first and last sectors and make sure we hit the right objects:
$ ceph osd pool create hugeimg 12 >/dev/null 2>&1
$ rbd pool init hugeimg
$ rbd create --size 4E --object-size 4K --image-feature layering hugeimg/img
$ DEV=$(sudo rbd map hugeimg/img)
$ xfs_io -c 'pwrite 0 512' $DEV >/dev/null # first sector
$ xfs_io -c 'pwrite 4611686018427387392 512' $DEV >/dev/null # last sector
$ sudo rbd unmap $DEV
$ get_field hugeimg/img size
4611686018427387904
$ get_field hugeimg/img objects
1125899906842624
$ rados -p hugeimg ls | grep $(get_field hugeimg/img block_name_prefix) | sort
.*\.0000000000000000 (re)
.*\.0003ffffffffffff (re)
Dump first and last megabytes:
$ DEV=$(sudo rbd map hugeimg/img)
$ dd if=$DEV bs=1M count=1 status=none | hexdump
0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
0000200 0000 0000 0000 0000 0000 0000 0000 0000
*
0100000
$ dd if=$DEV bs=1M skip=4398046511103 status=none | hexdump
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
00ffe00 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
0100000
$ sudo rbd unmap $DEV
$ ceph osd pool delete hugeimg hugeimg --yes-i-really-really-mean-it >/dev/null 2>&1
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