Re: Clarification required about xfs_metadump and xfs_mdrestore

On 9/27/16 12:04 PM, Darrick J. Wong wrote:
> On Tue, Sep 27, 2016 at 09:49:11AM -0400, murali krishna wrote:
>> Hi All,
>>
>> Got your email id from Nathan Scott.
>>
>> Could you please clarify the reasons behind stating below statement in
>> xfs_metadump man page.
>>
>>
>>
>> *xfs_metadump should not be used for any purposes other than for
>>  debugging and reporting filesystem problems*
>> Man page: http://man7.org/linux/man-pages/man8/xfs_metadump.8.html
>>
>> I am trying to encrypt my existing xfs drive (/dev/sda2) and would like to
>> backup metadata using xfs_metadump and restore it back using xfs_mdrestore
>> after encrypting my drive. In order to retain entire contents of my
>> realtime partition (/dev/sda1), I need to perform this step.
>>
>> Can I use xfs_metadump to backup meta-data of xfs  and restore it back
>> successfully ?
>> Why xfs_metadump should be specifically used as debugging tool ? Please
>> clarify ?
> 
> Uh.... if your goal is to back up data, reformat the storage with a crypto
> layer, and then restore the data, why not just use xfsdump/xfsrestore?
> Your data will end up all nicely defragmented, too.

Right, sorry - if you want to migrate to an encrypted block device, use
dump & restore.  Sorry, the metadata-restoration scheme confused me.  :)

-eric

> --D
> 
>>
>> Thanks in Advance,
>> Murali

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