Facing Error (dsmserv.dsk) while preparing TSM 5.5.6 for DB upgrade

Hi,
I am facing the error of "ANR0212E Unable to read disk definition file dsmserv.dsk." while in the preparation phase of DB upgrade of TSM 5.5.6 to TSM 6.3.4.
I have checked the file, its present and even copied it at Instance directory. Can anybody kindly help me on this.


thanks.
shoaib.


root@itsmapppsv01:/ #/usr/tivoli/tsm/upgrade/bin/dsmupgrd preparedb > prepare.out
root@itsmapppsv01:/ #tail -f prepare.out
(C) Copyright IBM Corporation 1990, 2009.
All rights reserved.
U.S. Government Users Restricted Rights - Use, duplication or disclosure
restricted by GSA ADP Schedule Contract with IBM Corporation.


ANR0900I Processing options file /tsm_filedev/tsmcfg/dsmserv.opt.
ANR7811I Using instance directory /.
ANR4726I The ICC support module has been loaded.
ANR0990I Server restart-recovery in progress.
ANR0212E Unable to read disk definition file dsmserv.dsk.
root@itsmapppsv01:/ #