Backup Problem in both offline+redo and online+redo

Dear Experts,

When i am taking online+redolog backup to my tape i am getting the error.

BR0203I to /dev/rmt0.1 ...

BR0278E Command output of 'LANG=C dd obs=64k bs=64k if=/oracle/XP3/sapdata1/sr3_1/sr3.data1 of=/dev/rmt0.1':

dd: /oracle/XP3/sapdata1/sr3_1/sr3.data1: Invalid argument

BR0280I BRBACKUP time stamp: 2008-09-15 12.02.16

BR0279E Return code from 'LANG=C dd obs=64k bs=64k if=/oracle/XP3/sapdata1/sr3_1/sr3.data1 of=/dev/rmt0.1': 2

BR0222E Copying /oracle/XP3/sapdata1/sr3_1/sr3.data1 to/from /dev/rmt0.1 failed due to previous errors

please help me

Regards

Santosh

Edited by: santosh gaikwad on Sep 15, 2008 10:15 AM