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Date: Tue, 13 Apr 2010 10:32:02 -0400
From: Phillip Susi <psusi@cfl.rr.com>
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Subject: Re: [linux-lvm] How do I properly backup and restore / on LVM2
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To: LVM general discussion and development <linux-lvm@redhat.com>
Cc: Alan Pek <alan.pek@db.com>

On 4/13/2010 6:03 AM, Alan Pek wrote:
> 
> Hi Folks,
> 
> Read through the doc and tried to create a snapshot lv for rootlv by
> doing, but failed.
> 
> singmrecfp1001:~ # lvcreate -L 2.5g -s -n rsnap rootvg
>   Path required for Logical Volume "rootvg"
>   The origin name should include the volume group.
>   lvcreate: Create a logical volume

You need to specify the name of the logical volume you are trying to
snapshot but you only gave the volume group name.  Try rootvg/rootlv,
assuming your root lv is named "rootlv".