mirror of
https://github.com/ceph/ceph
synced 2024-12-30 07:23:11 +00:00
65 lines
1.8 KiB
Perl
65 lines
1.8 KiB
Perl
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For reads, only the object extent needs to be reverse mapped:
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$ rbd create --size 20M img
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$ DEV=$(sudo rbd map img)
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$ xfs_io -c 'pwrite 0 20M' $DEV >/dev/null
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$ 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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$ rbd clone img@snap cloneimg
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$ rbd resize --no-progress --size 5M --allow-shrink cloneimg
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$ rbd resize --no-progress --size 20M cloneimg
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$ DEV=$(sudo rbd map cloneimg)
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0500000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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1400000
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress cloneimg
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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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For writes, the entire object needs to be reverse mapped:
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$ rbd create --size 2M img
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$ DEV=$(sudo rbd map img)
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$ xfs_io -c 'pwrite 0 1M' $DEV >/dev/null
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$ 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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$ rbd clone img@snap cloneimg
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$ rbd resize --no-progress --size 8M cloneimg
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$ DEV=$(sudo rbd map cloneimg)
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$ xfs_io -c 'pwrite -S 0xef 3M 1M' $DEV >/dev/null
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0100000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0300000 efef efef efef efef efef efef efef efef
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*
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0400000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0800000
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$ sudo rbd unmap $DEV
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$ DEV=$(sudo rbd map cloneimg)
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0100000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0300000 efef efef efef efef efef efef efef efef
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*
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0400000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0800000
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress cloneimg
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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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