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no need to supply held root, thin_dump -m will look it up

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Thanos Makatos 2016-03-04 18:30:02 +03:00
parent eac05c1b5d
commit f162d59bf6
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README.md
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@ -140,16 +140,9 @@ the metadata:
$ dmsetup message vg001-mythinpool-tpool 0 reserve_metadata_snap
Then, extract the held root from the device mapper's status of the thin pool
(7th field). This value must be passed to ```thin_dump```.
$ sudo dmsetup status vg001-mythinpool-tpool
0 8192 thin-pool 2 11/1024 1/64 10 rw discard_passdown
^
Extract the metadata:
$ sudo bin/thin_dump -m10 /dev/mapper/vg001-mythinpool_tmeta
$ sudo bin/thin_dump -m /dev/mapper/vg001-mythinpool_tmeta
<superblock uuid="" time="1" transaction="2" data_block_size="128"nr_data_blocks="0">
<device dev_id="1" mapped_blocks="1" transaction="0" creation_time="0" snap_time="1">
<single_mapping origin_block="0" data_block="0" time="0"/>