Re: Moving logical volumes from one disk to another

[christian gugliucci <christian gugliucci infocamere it>]

Ed Wilts wrote:

> I should know this, but I need to know what steps I need to do to move a
> logical volume group from one disk to another.  The newer disk is bigger
> (they're actually both Compaq SmartArray raidsets) and I'd like to
> extend vg00 to include the full disk space on the target disk.  I'll
> then be pulling the original disks out of the system (actually, the new
> disks will be moving to a new system where they'll be the only disks in
> that system).  To make matters a little more complex, / is on that disk.
> /boot is a separate partition so that's easy.  
>
> The source is /dev/ida/c0d0p<1-3> and the target is /dev/ida/c0d1p<1-3>
>
> I would hope that an vgextend to the new physical volume followed by an
> vgreduce but I'm not convinced that the used blocks would migrate in the
> process.
>
> Is it as easy as dropping to single user mode and doing a dd of the
> lvm partition?  An lvm expert I'm not...
>
> It would be nice if the lvm did software mirroring the way it does on
> HP-UX...
>
> Thanks,
>        .../Ed
>  
I usually do it on HP_UX without mirroring with pvmove command;
and i have tested also with redhat taroon;

the limit is you cannot move a logical volume from different volume group;
so under vg01:
pvmove -n /dev/vg01/mylv /dev/ida/c0d0p1  <- source  /dev/ida/c0d1p1 <- 
target
bye
Chris