Re: rbd volume upgrades

[Alex Elder <elder@inktank.com>]

On 11/09/2012 01:08 PM, Yehuda Sadeh wrote:
> On Fri, Nov 9, 2012 at 11:04 AM, Josh Durgin <josh.durgin@inktank.com> wrote:
>> On 11/09/2012 11:01 AM, Gregory Farnum wrote:
>>>
>>> I was asked today if there's a way to upgrade RBD volumes from v1 to
>>> v2. I didn't think so, but wanted
>>> 1) to make sure I'm right,
>>> 2) to ask how hard it would be,
>>> 3) to ask if we haven't done it because it didn't occur to us or
>>> because it's too hard.
>>> -Greg
>>>
>>
>> This was addressed in the original discussions about format 2.
>>
>> You need to export and then import the volume as format 2. Format 2 uses
>> different names for objects, so providing an 'upgrade' path would still
>> require copying all the data around.
>>
> Couldn't we just set a flag in the header specifying the object naming
> version, which would then only require updating the header?

That's an interesting thought.  A bit confusing, but only
to the code...

I think it's worth considering.

					-Alex


> Yehuda
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