[linux-lvm] Migrating LVM

Ray Morris support at bettercgi.com
Wed Apr 21 14:18:08 UTC 2010

    pvmove is good for when you have to keep the machine
live during the copy.  dd is about 10 times as fast if you
can be down during the copy.  This specific dd invocation
is the fastest I've found for the purpose, running 2-3 times
faster than a simple dd without arguments:

dd if=/dev/old_vg/$1 bs=64M iflag=direct | dd of=/dev/new_vg/$1 bs=64M  
Ray Morris
support at bettercgi.com

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On 04/20/2010 11:06:13 PM, M.Lewis wrote:
> I'm building a new machine with RAID1+LVM2. I plan to migrate the  
> data from the old machine HD to the new machine.
> Is it better to make the new VG the same name as the existing VG on  
> the old box? Or should I make it different.
> Is there an easy way to do this that I've not yet found? I was  
> thinking to make the new VG the same name as the old, add the old  
> drives to the machine then pvmove the data.
> Thanks for any pointers!
> Mike
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