mirror of
https://github.com/ceph/ceph
synced 2024-12-26 21:43:10 +00:00
04f5b343f9
Discard no longer guarantees zeroing, use BLKZEROOUT and "fallocate -z" instead (blkdiscard(8) in xenial doesn't support -z). Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
144 lines
3.5 KiB
Perl
144 lines
3.5 KiB
Perl
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$ get_block_name_prefix() {
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> rbd info --format=json $1 | python -c "import sys, json; print json.load(sys.stdin)['block_name_prefix']"
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> }
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$ rbd create --size 200M img
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$ DEV=$(sudo rbd map img)
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$ xfs_io -c 'pwrite -b 4M 0 200M' $DEV >/dev/null
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$ sudo rbd unmap $DEV
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$ rbd snap create img@snap
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$ rbd snap protect img@snap
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cloneimg1:
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1 object in an object set, 4M
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25 full object sets
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25 objects in total
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$ rbd clone img@snap cloneimg1
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$ DEV=$(sudo rbd map cloneimg1)
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ fallocate -z -l 100M $DEV
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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$ DEV=$(sudo rbd map cloneimg1)
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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cloneimg2:
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7 objects in an object set, 28M
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3 full object sets
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min((100M % 28M) / 512K, 7) = 7 objects in the last object set
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28 objects in total
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$ rbd clone --stripe-unit 512K --stripe-count 7 img@snap cloneimg2
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$ DEV=$(sudo rbd map cloneimg2)
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ fallocate -z -l 100M $DEV
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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$ DEV=$(sudo rbd map cloneimg2)
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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cloneimg3:
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23 objects in an object set, 92M
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1 full object set
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min((100M % 92M) / 512K, 23) = 16 objects in the last object set
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39 objects in total
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$ rbd clone --stripe-unit 512K --stripe-count 23 img@snap cloneimg3
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$ DEV=$(sudo rbd map cloneimg3)
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ fallocate -z -l 100M $DEV
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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$ DEV=$(sudo rbd map cloneimg3)
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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cloneimg4:
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65 objects in an object set, 260M
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0 full object sets
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min((100M % 260M) / 512K, 65) = 65 objects in the last object set
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65 objects in total
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$ rbd clone --stripe-unit 512K --stripe-count 65 img@snap cloneimg4
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$ DEV=$(sudo rbd map cloneimg4)
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ fallocate -z -l 100M $DEV
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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$ DEV=$(sudo rbd map cloneimg4)
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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c800000
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$ sudo rbd unmap $DEV
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$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg1)
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25
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$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg2)
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28
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$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg3)
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39
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$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg4)
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65
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$ rbd rm --no-progress cloneimg4
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$ rbd rm --no-progress cloneimg3
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$ rbd rm --no-progress cloneimg2
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$ rbd rm --no-progress cloneimg1
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$ rbd snap unprotect img@snap
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$ rbd snap rm --no-progress img@snap
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$ rbd rm --no-progress img
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