[linux-lvm] Let's try again with the lvm mirror failure.

[Gary Desrochers]

On Fri, Nov 28, 2008 at 10:20 PM, Gary Desrochers <garybrenda at comcast.net>wrote:

> On Fri, Nov 28, 2008 at 6:20 PM, Jaroslav Stava <jstava at redhat.com> wrote:
>
>> Hi,
>>
>> Gary Desrochers wrote:
>>
>>> I will try one more time. Can someone please tell me if it is possible to
>>> recover a mirrored drive?  If not then why are so many people using mirrors
>>> out there?
>>>
>> Some info:
>> man vgreduce (see --removemissing)
>> man lvm (see --partial activation)
>
>
> I did try that after reading about it.  It removed both the one that was
> missing and the one that was not missing before.  The partition is still
> there and I can get it to be seen but now I have to somehow get back the
> logical volume as well.  It no longer show up.  Well, it got reduced I
> guess?
>
>
>>
>>
>> Btw. it's a good idea to state your lvm version.
>>
> Sorry if I did not in my previous post.   Most of the lvm tools say:
>   LVM version:     2.02.28 (2007-08-24)
>   Library version: 1.02.22 (2007-08-21)
>   Driver version:  4.12.0
>
>
>>
>>  > So how do you fix up from a crashed primary mirror?
>>>
>> To make the VG consistent again you use "vgreduce --removemissing VG".
>> That will remove any LVs that were (even partially) on any missing PV.
>> When mirror legs are lost this way then mirror get downconverted.
>> You may want to use it with --test first, to see what you would loose.
>
>
> I had used --test and it looked like the only loss was that LV.
>
>
>>
>> (And you may try --mirrorsonly, it should fail when anything except mirror
>> legs would be lost. Without guarantee, depends on version.)
>
>
> Oh, so what you explained above that must be why the LV is gone now?  So
> how do I go from the LV that is now gone to an LV with only that one
> partition?  I cannot even see the volume group anymore since that seems to
> be now, "reduced"? :-)
>
>
>>
>>
>>
>>> As a second question, I know the extents and such.  Is there a way to
>>> copy off the data into a non-lvm partition?  At this point I will even take
>>> that.  I just want to get to the data.
>>>
>> Partial activation: "vgchange -ay -P". Doesn't make much sense
>> if you only lost a mirror leg.
>>
>>
>> Btw. when you need realtime response to your problem,
>> there is an irc channel #lvm on freenode (ask question and wait).
>
>
> No thank you, at the moment I don't need real time response.  Any response
> is a help.  I had posted twice before this from last Saturday and this is my
> only response.  I was not even sure I was getting through to the group since
> I did not get any of the messages I posted previously.
>
>
>>
>>
>> Regards,
>> Jaroslav Stava
>>
>> _______________________________________________
>> linux-lvm mailing list
>> linux-lvm at redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-lvm
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
> I do appreciate your response.  Any help you can give me I am grateful for.
> Gary
>
Okay.  I guess that was possibly a little hard for a question.  How about is
there a way to only copy the extent onto another partition?  That way I only
copy the data?
Gary
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