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|
$ get_block_name_prefix() {
> rbd info --format=json $1 | python3 -c "import sys, json; print(json.load(sys.stdin)['block_name_prefix'])"
> }
$ rbd create --size 200M img
$ DEV=$(sudo rbd map img)
$ xfs_io -c 'pwrite -b 4M 0 200M' $DEV >/dev/null
$ sudo rbd unmap $DEV
$ rbd snap create --no-progress img@snap
$ rbd snap protect img@snap
cloneimg1:
1 object in an object set, 4M
25 full object sets
25 objects in total
$ rbd clone img@snap cloneimg1
$ DEV=$(sudo rbd map cloneimg1)
$ hexdump $DEV
0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ fallocate -z -l 100M $DEV
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map cloneimg1)
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
cloneimg2:
7 objects in an object set, 28M
3 full object sets
min((100M % 28M) / 512K, 7) = 7 objects in the last object set
28 objects in total
$ rbd clone --stripe-unit 512K --stripe-count 7 img@snap cloneimg2
$ DEV=$(sudo rbd map cloneimg2)
$ hexdump $DEV
0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ fallocate -z -l 100M $DEV
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map cloneimg2)
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
cloneimg3:
23 objects in an object set, 92M
1 full object set
min((100M % 92M) / 512K, 23) = 16 objects in the last object set
39 objects in total
$ rbd clone --stripe-unit 512K --stripe-count 23 img@snap cloneimg3
$ DEV=$(sudo rbd map cloneimg3)
$ hexdump $DEV
0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ fallocate -z -l 100M $DEV
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map cloneimg3)
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
cloneimg4:
65 objects in an object set, 260M
0 full object sets
min((100M % 260M) / 512K, 65) = 65 objects in the last object set
65 objects in total
$ rbd clone --stripe-unit 512K --stripe-count 65 img@snap cloneimg4
$ DEV=$(sudo rbd map cloneimg4)
$ hexdump $DEV
0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ fallocate -z -l 100M $DEV
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map cloneimg4)
$ hexdump $DEV
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
6400000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
*
c800000
$ sudo rbd unmap $DEV
$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg1)
25
$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg2)
28
$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg3)
39
$ rados -p rbd ls | grep -c $(get_block_name_prefix cloneimg4)
65
$ rbd rm --no-progress cloneimg4
$ rbd rm --no-progress cloneimg3
$ rbd rm --no-progress cloneimg2
$ rbd rm --no-progress cloneimg1
$ rbd snap unprotect img@snap
$ rbd snap rm --no-progress img@snap
$ rbd rm --no-progress img
|
