URGENT MY server is down:::: Local disk is full

Hi my local proxmox disk is full and I am trying to add size on it but I am not able to add the size....

I do not find my disk under sys folder but I find it under the mapper folder...

so when I try to use the command.. lvresize -L-10G/dev/mapper/vg0-root


but I am not able to increase the size..

what should I do to be able to re-size it..

(I know that I can re-size the size of the VM disk in the webadmin but that dosent help mutch if the local disk is smaller)

Thx

Ole