Merge pull request #43 from tmakatos/master
document how to extract thin pool metadata
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README.md
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README.md
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@ -130,3 +130,28 @@ Once you've done this you can run the tests with a simple:
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Or specific tests with:
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Or specific tests with:
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cucumber features/thin_restore -n 'print help'
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cucumber features/thin_restore -n 'print help'
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Dump Metadata
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=============
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To dump the metadata of a live thin pool, you must first create a snapshot of
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the metadata:
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$ dmsetup message vg001-mythinpool-tpool 0 reserve_metadata_snap
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Extract the metadata:
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$ sudo bin/thin_dump -m /dev/mapper/vg001-mythinpool_tmeta
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<superblock uuid="" time="1" transaction="2" data_block_size="128"nr_data_blocks="0">
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<device dev_id="1" mapped_blocks="1" transaction="0" creation_time="0" snap_time="1">
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<single_mapping origin_block="0" data_block="0" time="0"/>
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</device>
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<device dev_id="2" mapped_blocks="1" transaction="1" creation_time="1" snap_time="1">
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<single_mapping origin_block="0" data_block="0" time="0"/>
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</device>
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</superblock>
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Finally, release the root:
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$ dmsetup message vg001-mythinpool-tpool 0 release_metadata_snap
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