[gentoo-user] [OT] Merging lvm partitions

[gentoo-user] [OT] Merging lvm partitions

[Peper]

Hello,
are you aware of any app (even for windows - don't kill me :D) that could 
merge partitions of 'Linux LVM' type?

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Peper
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Re: [gentoo-user] [OT] Merging lvm partitions

[Richard Fish]

On 12/12/05, Peper <peper@aster.pl> wrote:
> Hello,
> are you aware of any app (even for windows - don't kill me :D) that could
> merge partitions of 'Linux LVM' type?

Why?  If they really are LVM physical volumes, you can create a single
(or modify an existing) volume group span both, and create or grow
logical volumes without regards to the size of the individual
partitions.

-Richard

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[gentoo-user] Re: [OT] Merging lvm partitions

[Peper]

> Why?  If they really are LVM physical volumes, you can create a single
> (or modify an existing) volume group span both, and create or grow
> logical volumes without regards to the size of the individual
> partitions.
Just for order. I have 3 LVM partitions only beacause i've cleaned my disk off 
winshit in stages. 
And maybe one more thing: wouldn't it minimize logical volumes fragmentation?

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Peper
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Re: [gentoo-user] Re: [OT] Merging lvm partitions

[Stroller]

On Dec 12, 2005, at 6:27 pm, Peper wrote:

>> Why?  If they really are LVM physical volumes, you can create a single
>> (or modify an existing) volume group span both, and create or grow
>> logical volumes without regards to the size of the individual
>> partitions.
> Just for order. I have 3 LVM partitions only beacause i've cleaned my 
> disk off
> winshit in stages.

I think the only way to do this is to add a second hard-drive to the 
volume group, move data off the physical volumes of the 3 partitions, 
use `parted` or `cfdisk` to delete the 3 partitions & create a new one, 
then add it back to the volume group & migrate all the data off the new 
disk.... but it would be unusual for anyone to bother to do so (if 
you're not worried about uptime you could prolly just copy the data off 
& back on again). The whole point of LVM is to have the sort of 
convenience that you've experienced during your removal of Windows from 
those partitions

> And maybe one more thing: wouldn't it minimize logical volumes 
> fragmentation?

Interesting question. I would think that the abstraction layer of LVM 
in itself introduces a performance hit, but would guess it's quite 
small. I think the most people using LVM are prepared to sacrifice a 
little performance for its convenience.

Stroller.

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Re: [gentoo-user] Re: [OT] Merging lvm partitions

[Stroller]

On Dec 12, 2005, at 6:27 pm, Peper wrote:

>> Why?  If they really are LVM physical volumes, you can create a single
>> (or modify an existing) volume group span both, and create or grow
>> logical volumes without regards to the size of the individual
>> partitions.
> Just for order. I have 3 LVM partitions only beacause i've cleaned my 
> disk off
> winshit in stages.

I think the only way to do this is to add a second hard-drive to the 
volume group, move data off the physical volumes of the 3 partitions, 
use `parted` or `cfdisk` to delete the 3 partitions & create a new one, 
then add it back to the volume group & migrate all the data off the new 
disk.... but it would be unusual for anyone to bother to do so (if 
you're not worried about uptime you could prolly just copy the data off 
& back on again). The whole point of LVM is to have the sort of 
convenience that you've experienced during your removal of Windows from 
those partitions

I forgot  the link when I just sent this message before - I think this 
is the right section of the HOWTO:
http://www.tldp.org/HOWTO/LVM-HOWTO/removeadisk.html

> And maybe one more thing: wouldn't it minimize logical volumes 
> fragmentation?

Interesting question. I would think that the abstraction layer of LVM 
in itself introduces a performance hit, but would guess it's quite 
small. I think the most people using LVM are prepared to sacrifice a 
little performance for its convenience.

Stroller.

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