CentOS - Oct 2005 - HowTo copy a Logical Volume to another LV

hello all,

Hoping for some help on copying Logical Volumes.

I would like to copy an existing LV to a newly formed LV.

I don't want to do a snapshot of an existing LV.

Only way I've seen is to mount the to LV and:
mount /dev/vg00/lv00 /mnt/orig
mount /dev/vg00/lv01 /mnt/copy

cd /mnt/orig
tar cf - ./ |(cd /mnt/copy; tar xf - )

Is there a LV tool to do this?
Or an option used with lvcreate, such as --autobackup?
Or maybe pvmove, but that seems more for moving To LV from PV or vesa versa?

Thanks in advance,

Jesse Waters

Haven't actually tried it, but how about just a

dd if=/dev/vg00/lv00 of=/dev/vg00/lv01

Assuming both are unmounted/unchanging while you do it.

-jim

Jesse Waters wrote:
> hello all,
> 
> Hoping for some help on copying Logical Volumes.
> 
> I would like to copy an existing LV to a newly formed LV.
> 
> I don't want to do a snapshot of an existing LV.
> 
> Only way I've seen is to mount the to LV and:
> mount /dev/vg00/lv00 /mnt/orig
> mount /dev/vg00/lv01 /mnt/copy
> 
> cd /mnt/orig
> tar cf - ./ |(cd /mnt/copy; tar xf - )
> 
> Is there a LV tool to do this?
> Or an option used with lvcreate, such as --autobackup?
> Or maybe pvmove, but that seems more for moving To LV from PV or vesa
versa?
> 
> Thanks in advance,
> 
> Jesse Waters
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

On Fri, 2005-10-14 at 12:23 -0400, Jesse Waters wrote:
> hello all,
> 
> Hoping for some help on copying Logical Volumes.
> <snip>
> cd /mnt/orig
> tar cf - ./ |(cd /mnt/copy; tar xf - )
> 
> Is there a LV tool to do this?
> Or an option used with lvcreate, such as --autobackup?
> Or maybe pvmove, but that seems more for moving To LV from PV or vesa
versa?
To my knowledge, a comparable (better, faster, more/less * who knows)
way is

    find . | cpio -pduma /mnt/copy

There are other newer params to cpio, some of which *may* be needed for
some devices, etc. Since I haven[t read a cpio man page in about 20+
years, I suggest you give it a browse.

Cpio has/was/is always been preferred by many admins for many reasons.
But tar got all the GNU press so bias ruled over reason, as normal. Try
cpio and you might like it.

It does have a tar compatibility mode, which is relatively new to me.
Shows how long I've been involved with *(IX and how far I fall behind
when I stop reading stuff.
> <snip>
Bill
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Quoting Jesse Waters <jesse.waters at gmail.com>:
> hello all,
>
> Hoping for some help on copying Logical Volumes.
>
> I would like to copy an existing LV to a newly formed LV.
>
> I don't want to do a snapshot of an existing LV.
>
> Only way I've seen is to mount the to LV and:
> mount /dev/vg00/lv00 /mnt/orig
> mount /dev/vg00/lv01 /mnt/copy
>
> cd /mnt/orig
> tar cf - ./ |(cd /mnt/copy; tar xf - )
>
> Is there a LV tool to do this?
> Or an option used with lvcreate, such as --autobackup?
> Or maybe pvmove, but that seems more for moving To LV from PV or vesa
versa?
Hm, maybe using that new mirroring feature in LVM.  Mirror the thing, let it
sync, and than break the mirror.  You can have the thing online and available
while syncing, and just unmount it for the short period of time when breaking
the mirror (to avoid data corruption).  Just an idea to investigate, 
don't know
if it is actually doable (haven't yet had time to play with LVM 
mirroring, just
saw it in list of new features).

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Just wanted to thank everyone that replyed,

I will take a closer look at xfs and its features.


Regards,

Jesse Waters