[linux-lvm] merge two lvms on same VG

[linux-lvm] merge two lvms on same VG

[tariq wali]

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Hi, I had a situation to combine two LVM's on the same VG , other than
wiping the existing ones and recreating a new one is there a way to merge
the two on same VG ?

-- 
*Tariq Wali.*

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Re: [linux-lvm] merge two lvms on same VG

[Fran Garcia]

On Wed, Sep 5, 2012 at 1:16 PM, tariq wali <ganaiwali@gmail.com> wrote:
> Hi, I had a situation to combine two LVM's on the same VG , other than
> wiping the existing ones and recreating a new one is there a way to merge
> the two on same VG ?

vgmerge.  You need to have the source VG with all your LVs inactive
and the PE size must be the same in both VGs.


Basically this would be:

lvchange -a n /dev/vg02/lv01
lvchange -a n /dev/vg02/lv02
lvchange -a n /dev/vg02/lv03
...
vgmerge vg01 vg02
vgchange -ay


this would put all the LVs from vg02 into the vg01 VG.

HTH

Re: [linux-lvm] merge two lvms on same VG

[tariq wali]

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thanks for the reply , but wouldn't that merge LV's from two different
volume groups and for some weird requirement I wanted to merge LV's from
the same VG , say

merge /dev/vg0/data and /dev/vg0/data1 into a  merged volume without any
data loss .

On Mon, Sep 10, 2012 at 4:02 PM, Fran Garcia <franchu.garcia@gmail.com>wrote:

> On Wed, Sep 5, 2012 at 1:16 PM, tariq wali <ganaiwali@gmail.com> wrote:
> > Hi, I had a situation to combine two LVM's on the same VG , other than
> > wiping the existing ones and recreating a new one is there a way to merge
> > the two on same VG ?
>
> vgmerge.  You need to have the source VG with all your LVs inactive
> and the PE size must be the same in both VGs.
>
>
> Basically this would be:
>
> lvchange -a n /dev/vg02/lv01
> lvchange -a n /dev/vg02/lv02
> lvchange -a n /dev/vg02/lv03
> ...
> vgmerge vg01 vg02
> vgchange -ay
>
>
> this would put all the LVs from vg02 into the vg01 VG.
>
> HTH
>
> _______________________________________________
> 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/
>



-- 
*Tariq Wali.*

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Re: [linux-lvm] merge two lvms on same VG

[flavio-redhat]

On 09/05/2012 02:16 PM, tariq wali wrote:
> Hi, I had a situation to combine two LVM's on the same VG , other than
> wiping the existing ones and recreating a new one is there a way to
> merge the two on same VG ? 

No. You must delete one of the 2 and extend the remaining one.
If you don't have enough space to save all the data in the LV that you
want to delete, you can manually shrink the filesystem on it, shrink the
LV, extend the other LV, extend the filesystem and move data. Then
restart shrinking and extending until all the data is moved.


-- 
Flavio Visentin

A computer is like an air conditioner,
it stops working when you open Windows

Re: [linux-lvm] merge two lvms on same VG

[Scott Merrilees]

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Use vgcfgbackup then edit the backup, then restore the edited backup. You
might have to create a test lv with similar geometry to see how the lv is
represented in the config file.
On Sep 10, 2012 11:40 PM, "tariq wali" <ganaiwali@gmail.com> wrote:

> thanks for the reply , but wouldn't that merge LV's from two different
> volume groups and for some weird requirement I wanted to merge LV's from
> the same VG , say
>
> merge /dev/vg0/data and /dev/vg0/data1 into a  merged volume without any
> data loss .
>
> On Mon, Sep 10, 2012 at 4:02 PM, Fran Garcia <franchu.garcia@gmail.com>wrote:
>
>> On Wed, Sep 5, 2012 at 1:16 PM, tariq wali <ganaiwali@gmail.com> wrote:
>> > Hi, I had a situation to combine two LVM's on the same VG , other than
>> > wiping the existing ones and recreating a new one is there a way to
>> merge
>> > the two on same VG ?
>>
>> vgmerge.  You need to have the source VG with all your LVs inactive
>> and the PE size must be the same in both VGs.
>>
>>
>> Basically this would be:
>>
>> lvchange -a n /dev/vg02/lv01
>> lvchange -a n /dev/vg02/lv02
>> lvchange -a n /dev/vg02/lv03
>> ...
>> vgmerge vg01 vg02
>> vgchange -ay
>>
>>
>> this would put all the LVs from vg02 into the vg01 VG.
>>
>> HTH
>>
>> _______________________________________________
>> 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/
>>
>
>
>
> --
> *Tariq Wali.*
>
>
> _______________________________________________
> 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/
>

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