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

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

[Gary Desrochers]

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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?

In a previous message posted to the forums I said:

> I had a disk failure for my lvm mirror.  It was between two disks.  This
was a failure of the primary.
>
> I have been trying to recover the mirror but I cannot find directions as
to what to do.
>
> Seems like if I create a new partition, give it the old uuid and then try
to load everything I get superblock errors.
>
> So how do you fix up from a crashed primary mirror?

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.

Gary

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

[Jaroslav Stava]

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)

Btw. it's a good idea to state your lvm version.

> > 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.
(And you may try --mirrorsonly, it should fail when anything except mirror
legs would be lost. Without guarantee, depends on version.)

>
> 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).

Regards,
Jaroslav Stava

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

[Gary Desrochers]

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On Fri, Nov 28, 2008 at 6:20 PM, Jaroslav Stava <jstava@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@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

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

[Gary Desrochers]

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

> On Fri, Nov 28, 2008 at 6:20 PM, Jaroslav Stava <jstava@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@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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Re: [linux-lvm] Let's try again with the lvm mirror failure.

[Gary Desrochers]

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

>
>
> On Fri, Nov 28, 2008 at 10:20 PM, Gary Desrochers <garybrenda@comcast.net>wrote:
>
>> On Fri, Nov 28, 2008 at 6:20 PM, Jaroslav Stava <jstava@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@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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