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Re: copying lvm with the same name



On Thursday 19 March 2009 18:02:26 Frank Cox wrote:
...
>   LV Name                /dev/VolGroup00/LogVol00
>   VG Name                VolGroup00
>   LV UUID                yFemKc-s2bo-zZC0-cc7q-50By-4jQM-G1MsQr
...
>   Block device           253:0
>
>   --- Segments ---
>   Logical extent 0 to 8872:
>     Type		linear
>     Physical volume	/dev/sdb2
>     Physical extents	0 to 8872
...
>   LV Name                /dev/VolGroup00/LogVol01
>   VG Name                VolGroup00
>   LV UUID                6UuO4G-X2dI-LirG-HvVF-zLfz-hrYW-NYZEdN
...
>   Block device           253:1
>
>   --- Segments ---
>   Logical extent 0 to 61:
>     Type		linear
>     Physical volume	/dev/sdb2
>     Physical extents	8873 to 8934

Here's the useful information about what's currently active (the "Block device" 
should correspond to numbers you'll see in the output from "ls -l /dev/mapper") 
and below we can match these details against the physical devices:

>   PV Name               /dev/sdb2
...
>   Allocated PE          8935
>   PV UUID               SW3Qdy-7qcu-0Th1-Rb2Z-ui24-14ab-qRpMoq
>
>   --- Physical Segments ---
>   Physical extent 0 to 8872:
>     Logical volume	/dev/VolGroup00/LogVol00
>     Logical extents	0 to 8872

This matches up with your LogVol00 above ...

>   Physical extent 8873 to 8934:
>     Logical volume	/dev/VolGroup00/LogVol01
>     Logical extents	0 to 61

... and this with your LogVol01 above.

>   PV Name               /dev/sda2
>   VG Name               VolGroup00
...
>   PV UUID               1dl8EY-s2Qe-W50Y-wU8V-nCRJ-5Upz-SEkJgp
...
>   Physical extent 0 to 14834:
>     Logical volume	/dev/VolGroup00/LogVol00
>     Logical extents	0 to 14834
>   Physical extent 14835 to 14896:
>     Logical volume	/dev/VolGroup00/LogVol01
>     Logical extents	0 to 61

This is your "duplicate" volume group, which has likewise two logical volumes, 
but looks like one of them is considerably larger.

You should probably be able to get some sense out of this by doing:


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