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man: update lvmthin about repair and recovery

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Explain the thin metadata repair might not work.
Clarify that a full thin pool won't require fsck for journaled fs.
This commit is contained in:
David Teigland 2015-02-06 04:24:30 -06:00
parent f80e7bb61b
commit 97e3e84c2c
1 changed files with 10 additions and 3 deletions
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13
man/lvmthin.7.in
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@ -431,8 +431,13 @@ This is not recommended.
controls the command options used for the thin_check command. controls the command options used for the thin_check command.
If the thin_check command finds a problem with the metadata, If the thin_check command finds a problem with the metadata,
the thin pool LV is not activated, and the thin pool metadata should the thin pool LV is not activated, and the thin pool metadata needs
be repaired. to be repaired.
Simple repair commands are not always successful. Advanced repair may
require editing thin pool metadata and lvm metadata. Newer versions of
the kernel and lvm tools may be more successful at repair. Report the
details of damaged thin metadata to get the best advice on recovery.
Command to repair a thin pool: Command to repair a thin pool:
.br .br
@ -785,7 +790,9 @@ return to normal operation.
While waiting to be extended, the thin pool will queue writes for up to 60 While waiting to be extended, the thin pool will queue writes for up to 60
seconds (the default). If data space has not been extended after this seconds (the default). If data space has not been extended after this
time, the queued writes will return an error to the caller, e.g. the file time, the queued writes will return an error to the caller, e.g. the file
system. This can result in file system corruption that may require fsck. system. This can result in file system corruption for non-journaled file
systems that may require fsck. When a thin pool returns errors for writes
to a thin LV, any file system is subject to losing unsynced user data.
The 60 second timeout can be changed or disabled with the dm\-thin\-pool The 60 second timeout can be changed or disabled with the dm\-thin\-pool
kernel module option kernel module option