[linux-lvm] Move an array/volgroup to another machine.

[linux-lvm] Move an array/volgroup to another machine.

[Gerry Reno]

We built a replacement server (x86_64) for an older server (x86).  Now 
we want to move a RAID-5 array intact from the older machine over to the 
new machine.  We know the UUID of the array and of all the PV and VG on 
the array.  So what commands should we perform after plugging in all the 
array drives to the new server to bring up the array and lvm on the new 
machine?

Regards,
Gerry

Re: [linux-lvm] Move an array/volgroup to another machine.

[Eric Brunson]

On 04/16/2009 10:07 AM, Gerry Reno wrote:
> We built a replacement server (x86_64) for an older server (x86).  Now 
> we want to move a RAID-5 array intact from the older machine over to 
> the new machine.  We know the UUID of the array and of all the PV and 
> VG on the array.  So what commands should we perform after plugging in 
> all the array drives to the new server to bring up the array and lvm 
> on the new machine?

"vgscan" and "vgchange -a VGNAME" I believe.

Make sure your VG name doesn't conflict with any already in the machine.

>
> Regards,
> Gerry
>
> _______________________________________________
> 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/

Re: [linux-lvm] Move an array/volgroup to another machine.

[Eric Brunson]

On 04/16/2009 10:12 AM, Eric Brunson wrote:
> On 04/16/2009 10:07 AM, Gerry Reno wrote:
>> We built a replacement server (x86_64) for an older server (x86).  
>> Now we want to move a RAID-5 array intact from the older machine over 
>> to the new machine.  We know the UUID of the array and of all the PV 
>> and VG on the array.  So what commands should we perform after 
>> plugging in all the array drives to the new server to bring up the 
>> array and lvm on the new machine?
>
> "vgscan" and "vgchange -a VGNAME" I believe.


Sorry, doing three things at once:  vgchange -a y VGNAME


>
> Make sure your VG name doesn't conflict with any already in the machine.
>
>>
>> Regards,
>> Gerry
>>
>> _______________________________________________
>> 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/
>
> _______________________________________________
> 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/

Re: [linux-lvm] Move an array/volgroup to another machine.

[Gerry Reno]

Eric Brunson wrote:
> On 04/16/2009 10:12 AM, Eric Brunson wrote:
>> On 04/16/2009 10:07 AM, Gerry Reno wrote:
>>> We built a replacement server (x86_64) for an older server (x86).  
>>> Now we want to move a RAID-5 array intact from the older machine 
>>> over to the new machine.  We know the UUID of the array and of all 
>>> the PV and VG on the array.  So what commands should we perform 
>>> after plugging in all the array drives to the new server to bring up 
>>> the array and lvm on the new machine?
>>
>> "vgscan" and "vgchange -a VGNAME" I believe.
>
>
> Sorry, doing three things at once:  vgchange -a y VGNAME
>
>
>>
>> Make sure your VG name doesn't conflict with any already in the machine.
>>
Will vgchange activate the raid array?

The new server just has a couple raid-1 arrays on it right now.  But we 
need the raid-5 to be activated because there is a volgroup that uses 
the raid-5 device as it's PV.

Regards,
Gerry

Re: [linux-lvm] Move an array/volgroup to another machine.

[Eric Brunson]

On 04/16/2009 10:33 AM, Gerry Reno wrote:
> Eric Brunson wrote:
>> On 04/16/2009 10:12 AM, Eric Brunson wrote:
>>> On 04/16/2009 10:07 AM, Gerry Reno wrote:
>>>> We built a replacement server (x86_64) for an older server (x86).  
>>>> Now we want to move a RAID-5 array intact from the older machine 
>>>> over to the new machine.  We know the UUID of the array and of all 
>>>> the PV and VG on the array.  So what commands should we perform 
>>>> after plugging in all the array drives to the new server to bring 
>>>> up the array and lvm on the new machine?
>>>
>>> "vgscan" and "vgchange -a VGNAME" I believe.
>>
>>
>> Sorry, doing three things at once:  vgchange -a y VGNAME
>>
>>
>>>
>>> Make sure your VG name doesn't conflict with any already in the 
>>> machine.
>>>
> Will vgchange activate the raid array?


Is it an md (software) RAID or a hardware RAID device?

If the former, then I'm not sure.  I'll have to defer to someone with 
more md experience.
If the latter, then it depends of if you have the correct drivers and 
hardware detection.


>
> The new server just has a couple raid-1 arrays on it right now.  But 
> we need the raid-5 to be activated because there is a volgroup that 
> uses the raid-5 device as it's PV.
>
> Regards,
> Gerry
>
> _______________________________________________
> 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/

Re: [linux-lvm] Move an array/volgroup to another machine.

[Gerry Reno]

Eric Brunson wrote:
> On 04/16/2009 10:33 AM, Gerry Reno wrote:
>> Eric Brunson wrote:
>>> On 04/16/2009 10:12 AM, Eric Brunson wrote:
>>>> On 04/16/2009 10:07 AM, Gerry Reno wrote:
>>>>> We built a replacement server (x86_64) for an older server (x86).  
>>>>> Now we want to move a RAID-5 array intact from the older machine 
>>>>> over to the new machine.  We know the UUID of the array and of all 
>>>>> the PV and VG on the array.  So what commands should we perform 
>>>>> after plugging in all the array drives to the new server to bring 
>>>>> up the array and lvm on the new machine?
>>>>
>>>> "vgscan" and "vgchange -a VGNAME" I believe.
>>>
>>>
>>> Sorry, doing three things at once:  vgchange -a y VGNAME
>>>
>>>
>>>>
>>>> Make sure your VG name doesn't conflict with any already in the 
>>>> machine.
>>>>
>> Will vgchange activate the raid array?
>
>
> Is it an md (software) RAID or a hardware RAID device?
>
> If the former, then I'm not sure.  I'll have to defer to someone with 
> more md experience.
> If the latter, then it depends of if you have the correct drivers and 
> hardware detection.
>
>
>>
>> The new server just has a couple raid-1 arrays on it right now.  But 
>> we need the raid-5 to be activated because there is a volgroup that 
>> uses the raid-5 device as it's PV.
>>
It's an 'md' software raid device.  I think we can probably just try to 
assemble the array using the UUID.  Maybe something like:
mdadm -vv -A /dev/md4 --uuid=UUID

Regards,
Gerry

Re: [linux-lvm] Move an array/volgroup to another machine.

[Luca Berra]

On Thu, Apr 16, 2009 at 12:49:52PM -0400, Gerry Reno wrote:
> It's an 'md' software raid device.  I think we can probably just try to 
> assemble the array using the UUID.  Maybe something like:
> mdadm -vv -A /dev/md4 --uuid=UUID
>
the above depende on the device line in your mdadm.conf,
if it is something like 'DEVICE partitions' or 'DEVICE /dev/*' it should
work.
you still would like to have it in mdadm.conf for automatic activation
at boot.
i would run
mdadm -Esc partitions | grep UUID

maybe check the line you added to see if the minor is what you want
and add it to /etc/mdadm.conf

L.

-- 
Luca Berra -- bluca@comedia.it
         Communication Media & Services S.r.l.
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