[linux-lvm] Raid1 -> linear conversion = destroyed data

[Jason Warr]

On Thu, 11 Dec 2014 08:17:03 -0600, Phillip Susi <psusi at ubuntu.com> wrote:

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> On 12/10/2014 8:50 PM, Jason Warr wrote:
>> It ignores the name because what it does with "--trackchanges" is
>> rename the mirror leg to a visible & read only version of the meta.
>> Sample:
>
> You mean it changes the flags to visible and read only.  I don't see
> why it can't rename it as well.
>

Yes, visible and ro is what I meant.

>> You can't track changes and rename the "backup" leg at the same
>> time. If you wanted to keep the backup leg after making sure the in
>> use one was good you would need to issue a new "--splitmirror"
>> command with a new volume name and *no* "--trackchanges" option.
>
> Why not?  A name is just a name; it does not *have* to be called
> origin_rimage_0.

I don't disagree but it is the way the tool works.  My best guess is the  
name is ignored because when you issue "--trackchanges" it is not really  
splitting off the leg, more of off lining it from the perspective of the  
mirror.  It was likely a developer decision for lvconvert to do it that  
way when adding in RAID1 from the md stack.

The documentation for lvconvert could be more clear about it.

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