[linux-lvm] How to 'copy' a volume?

Stuart D. Gathman stuart at bmsi.com
Fri Jan 4 16:30:07 UTC 2008

On Fri, 4 Jan 2008, Erich Weiler wrote:

> # lvcreate -L 500G -n clone volgroup00
> # dd if=/dev/volgroup00/original of=/dev/volgroup00/clone
> The machine then had a kernel panic (I think).  I'm remote so I'm not 
> sure, but I'll be going in soon to check on it.  Not a critical system 
> so no big deal.  I'll let everyone one what I see at the console.

Could be very slow.  On one of my systems, a blocksize of 300k is optimal.
The default block size is usually 512 bytes.

# dd if=/dev/volgroup00/original of=/dev/volgroup00/clone bs=300k

	      Stuart D. Gathman <stuart at bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
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