Rocket Servergraph gives this information too.

On Mon, Mar 31, 2014 at 10:35:05PM +0530, Ashish Sharma wrote:
> Hi,
>
> use Tsm manager
>
>
> On Mon, Mar 31, 2014 at 10:20 PM, Saravanan <evergreen.sarav AT gmail DOT 
> com>wrote:
>
> > Hi,
> >
> > Is there any GUI based tool or script available to find out drive
> > utilization during the backup window(eg: 6 pm to 7 am )?
> >
> >
> >
> >
> > Thanks in advance
> >
> > By Sarav
> > +65-82284384
> >
>
>
>
> --
> Best Regards
> Ashish Sharma
> Consultant
> HCL Technologies
> 919717003853

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