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

[Gary Desrochers]

On Thu, Dec 11, 2008 at 8:18 PM, Gary Desrochers <garybrenda at comcast.net>wrote:

>
>
> 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
>
Please.  Can anyone understand what I am asking in any of this or is there
another group I should be asking this?
Gary
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