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Commit | Line | Data |
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11fdf7f2 TL |
1 | |
2 | For reads, only the object extent needs to be reverse mapped: | |
3 | ||
9f95a23c | 4 | $ rbd create --size 5M img |
11fdf7f2 | 5 | $ DEV=$(sudo rbd map img) |
9f95a23c | 6 | $ xfs_io -c 'pwrite 0 5M' $DEV >/dev/null |
11fdf7f2 TL |
7 | $ sudo rbd unmap $DEV |
8 | $ rbd snap create img@snap | |
9 | $ rbd snap protect img@snap | |
10 | $ rbd clone img@snap cloneimg | |
9f95a23c | 11 | $ rbd resize --no-progress --size 12M cloneimg |
11fdf7f2 TL |
12 | $ DEV=$(sudo rbd map cloneimg) |
13 | $ hexdump $DEV | |
14 | 0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd | |
15 | * | |
16 | 0500000 0000 0000 0000 0000 0000 0000 0000 0000 | |
17 | * | |
9f95a23c TL |
18 | 0c00000 |
19 | $ dd if=$DEV iflag=direct bs=4M status=none | hexdump | |
20 | 0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd | |
21 | * | |
22 | 0500000 0000 0000 0000 0000 0000 0000 0000 0000 | |
23 | * | |
24 | 0c00000 | |
11fdf7f2 TL |
25 | $ sudo rbd unmap $DEV |
26 | $ rbd rm --no-progress cloneimg | |
27 | $ rbd snap unprotect img@snap | |
28 | $ rbd snap rm --no-progress img@snap | |
29 | $ rbd rm --no-progress img | |
30 | ||
31 | For writes, the entire object needs to be reverse mapped: | |
32 | ||
33 | $ rbd create --size 2M img | |
34 | $ DEV=$(sudo rbd map img) | |
35 | $ xfs_io -c 'pwrite 0 1M' $DEV >/dev/null | |
36 | $ sudo rbd unmap $DEV | |
37 | $ rbd snap create img@snap | |
38 | $ rbd snap protect img@snap | |
39 | $ rbd clone img@snap cloneimg | |
40 | $ rbd resize --no-progress --size 8M cloneimg | |
41 | $ DEV=$(sudo rbd map cloneimg) | |
42 | $ xfs_io -c 'pwrite -S 0xef 3M 1M' $DEV >/dev/null | |
43 | $ hexdump $DEV | |
44 | 0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd | |
45 | * | |
46 | 0100000 0000 0000 0000 0000 0000 0000 0000 0000 | |
47 | * | |
48 | 0300000 efef efef efef efef efef efef efef efef | |
49 | * | |
50 | 0400000 0000 0000 0000 0000 0000 0000 0000 0000 | |
51 | * | |
52 | 0800000 | |
53 | $ sudo rbd unmap $DEV | |
54 | $ DEV=$(sudo rbd map cloneimg) | |
55 | $ hexdump $DEV | |
56 | 0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd | |
57 | * | |
58 | 0100000 0000 0000 0000 0000 0000 0000 0000 0000 | |
59 | * | |
60 | 0300000 efef efef efef efef efef efef efef efef | |
61 | * | |
62 | 0400000 0000 0000 0000 0000 0000 0000 0000 0000 | |
63 | * | |
64 | 0800000 | |
65 | $ sudo rbd unmap $DEV | |
66 | $ rbd rm --no-progress cloneimg | |
67 | $ rbd snap unprotect img@snap | |
68 | $ rbd snap rm --no-progress img@snap | |
69 | $ rbd rm --no-progress img |