LVM problem

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Hi all.
I've installed etch on a file server with a raid array of 3,5 TB.
With the raid system i've created two virtual disk, sda for the OS and
sdb for the user datas shared via samba.
I've installed lvm for the second disk and i created two logical volumes
data (2TB) and admin (200GB).
I mounted them and everything is ok.
I wanted to extend the data volume to the fill all the free space
(962GB) but when i make:

lvextend -L+962G /dev/mapper/uservg-data

It respond me:

Volume group mapper doesn't exist

But:

root@srv-file:~# ls -l /dev/mapper/uservg-data
brw-rw---- 1 root disk 254, 0 2006-12-29 10:40 /dev/mapper/uservg-data

I searched a bit but nothing found.

Pier
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