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4fe245cc2f
There is no /usr/bin/python symlink in CentOS 8 even if python2 is installed. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
42 lines
1.3 KiB
Perl
42 lines
1.3 KiB
Perl
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$ get_field() {
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> rbd info --format=json $1 | python3 -c "import sys, json; print(json.load(sys.stdin)['$2'])"
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> }
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Write to first and last sectors and make sure we hit the right objects:
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$ ceph osd pool create hugeimg 12 >/dev/null 2>&1
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$ rbd pool init hugeimg
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$ rbd create --size 4E --object-size 4K --image-feature layering hugeimg/img
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$ DEV=$(sudo rbd map hugeimg/img)
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$ xfs_io -c 'pwrite 0 512' $DEV >/dev/null # first sector
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$ xfs_io -c 'pwrite 4611686018427387392 512' $DEV >/dev/null # last sector
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$ sudo rbd unmap $DEV
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$ get_field hugeimg/img size
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4611686018427387904
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$ get_field hugeimg/img objects
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1125899906842624
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$ rados -p hugeimg ls | grep $(get_field hugeimg/img block_name_prefix) | sort
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.*\.0000000000000000 (re)
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.*\.0003ffffffffffff (re)
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Dump first and last megabytes:
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$ DEV=$(sudo rbd map hugeimg/img)
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$ dd if=$DEV bs=1M count=1 status=none | hexdump
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0000200 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0100000
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$ dd if=$DEV bs=1M skip=4398046511103 status=none | hexdump
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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00ffe00 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0100000
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$ sudo rbd unmap $DEV
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$ ceph osd pool delete hugeimg hugeimg --yes-i-really-really-mean-it >/dev/null 2>&1
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