I ran into that a while ago.  It just plain doesn't work like it should.
Got some responses from this list, but lost my test server and never got
around to trying it again:

http://www.mail-archive.com/adsm-l AT vm.marist DOT edu/msg76823.html


On Thu, Jan 14, 2010 at 4:24 PM, Christian Svensson <
Christian.Svensson AT cristie DOT se> wrote:

> Hi Everyone,
> I'm doing a TSM Server Database recovery on a server right now where I have
> multiple Server Instance.
> When I run dsmserv.exe restore db from the directory where I have the
> correct dsmserv.opt and dsmserv.dsk, then some how does TSM try to restore
> my other instance that is also instance server1 in my tsm environment.
>
> When I normally start TSM I will type dsmserv.exe -k server2 but somehow
> doesn't dsmserv restore db working with the switch -k
>
> Does anyone have any other ideas how to restore on a dedicated server
> instance?
>
> TSM Server 5.5.2 on Windows Server 2003 x64
>
>
> Best Regards
> Christian Svensson
>
> Cell: +46-70-325 1577
> E-mail: Christian.Svensson AT cristie DOT se
> Skype: cristie.christian.svensson
> Supported Platform for CPU2TSM::
> http://www.cristie.se/cpu2tsm-supported-platforms
>