69 lines
2.4 KiB
Plaintext
69 lines
2.4 KiB
Plaintext
NAME
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thin_check - validates thin provisioning metadata on a device or file
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SYNOPSIS
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thin_check [options] {device|file}
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DESCRIPTION
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thin_check checks thin provisioning metadata created by the device-mapper
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thin provisioning target on a device or file.
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The tool cannot be run on live metadata unless the --metadata-snapshot
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option is used.
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OPTIONS
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-q, --quiet Suppress output messages, return only exit code.
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-h, --help Print help and exit.
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-V, --version Output version information and exit.
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--super-block-only Only check the superblock.
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--skip-mappings Skip checking of the block mappings which make up the bulk of the metadata.
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--ignore-non-fatal-errors Will only return a non-zero exit code if it finds a fatal error.
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An example of a nonfatal error is an incorrect data block reference count
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causing a block to be considered allocated when it in fact isn't. Ignoring
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errors for a long time is not advised, you really should be using
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thin_repair to fix them.
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--clear-needs-check-flag Clears the 'needs_check' flag in the superblock.
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The kernel may set a flag to force the pool to be checked before it's next
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activated. Set this switch to clear the flag if the check is successful.
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If the metadata check failed, the flag is not cleared and a thin_repair run
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is needed to fix any issues. After thin_repair succeeded, you may run
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thin_check again.
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--metadata-snapshot, -m Check the metadata snapshot.
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This will check the devices tree and mappings in a metadata snapshot.
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The snap does not contain space maps, so these will not be checked. This
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may be used on live metadata.
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--auto-repair Automatically repair any trivial issues found with the metadata.
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Currently only fixes metadata leaks.
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--override-mapping-root <block> Specify a mapping root to use.
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Don't use this. This overrides what's specified in the superblock. Only
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use this if you really understand the metadata format and are trying to
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recover damaged metadata.
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EXAMPLE
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Analyses thin provisioning metadata on logical volume /dev/vg/metadata:
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$ thin_check /dev/vg/metadata
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The device must not be actively used by the target when running.
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DIAGNOSTICS
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thin_check returns an exit code of 0 for success or 1 for error.
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SEE ALSO
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thin_dump(8), thin_repair(8), thin_restore(8), thin_rmap(8), thin_metadata_size(8)
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AUTHOR
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Joe Thornber <ejt@redhat.com>, Heinz Mauelshagen <heinzm@redhat.com>
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