here is my df -h commnad

[oraosc:/u10/app/ORACLE/admin/dss]df -h
Filesystem size used avail capacity Mounted on
/ 12G 11G 282M 98% /
/dev 12G 11G 282M 98% /dev
/lib 12G 11G 282M 98% /lib
/opt/emc 12G 11G 282M 98% /opt/emc
/platform 12G 11G 282M 98% /platform
/sbin 12G 11G 282M 98% /sbin
/syshome 3.9G 357M 3.6G 9% /syshome
/u10/app/ORACLE/oradata
25G 1.7G 23G 7% /u10/app/ORACLE/oradata
/u100/app/ORACLE/oradata
9.8G 2.2G 7.5G 23% /u100/app/ORACLE/oradata
/u110/app/ORACLE/oradata
9.8G 1.6G 8.1G 17% /u110/app/ORACLE/oradata
/u120/app/ORACLE/oradata
9.8G 2.6G 7.1G 28% /u120/app/ORACLE/oradata
/u20/app/ORACLE/oradata
9.8G 3.8G 6.0G 39% /u20/app/ORACLE/oradata
/u30/app/ORACLE/oradata
9.8G 2.5G 7.2G 26% /u30/app/ORACLE/oradata
/u40/app/ORACLE/oradata
9.8G 3.0G 6.7G 32% /u40/app/ORACLE/oradata
/u50/app/ORACLE/oradata
9.8G 3.6G 6.1G 38% /u50/app/ORACLE/oradata
/u60/app/ORACLE/oradata
9.8G 3.3G 6.4G 34% /u60/app/ORACLE/oradata
/u70/app/ORACLE/oradata
9.8G 2.5G 7.2G 26% /u70/app/ORACLE/oradata
/u80/app/ORACLE/oradata
9.8G 2.4G 7.3G 25% /u80/app/ORACLE/oradata
/u90/app/ORACLE/oradata
9.8G 3.0G 6.7G 31% /u90/app/ORACLE/oradata

===================================

Obviously, i have allocated 25 GB for '/u10/app/ORACLE/oradata' file system and the dump file is writing at 'u10/app/ORACLE/product/10.2.0.1/rdbms/log/' directory..

So i dont think, space is an issue. As far as Permissions, it has already written like 3 GB of data before it throws this error..so, Permissions are not an issue.

any ideas ?

thanks
Ron