Oracle 10gR2 and Solaris10.

Iam trying to take a datapump back up of a schema 'DSS', and i get this error message..here are the details..I have about 25GB space left on that file system.

====================================
SQL> SELECT * FROM dba_directories;

OWNER DIRECTORY_NAME DIRECTORY_PATH
----------------------------------------------------------
SYS DPUMP_DIR1 /tmp/dump_dir
SYS WORK_DIR /ade/aime_ship_10gR2_050630/oracle/work
SYS DATA_PUMP_DIR /u10/app/ORACLE/product/10.2.0.1/rdbms/log/
SYS ADMIN_DIR /ade/aime_ship_10gR2_050630/oracle/md/admin


$expdp system/password@dss DIRECTORY=DATA_PUMP_DIR dumpfile=dssdp.dmp schema=dss

Export: Release 10.2.0.1.0 - 64bit Production on Thursday, 19 April, 2007 11:02:34

Copyright (c) 2003, 2005, Oracle. All rights reserved.
;;;
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_02": system/********@dss DIRECTORY=DATA_PUMP_DIR dumpfile=dssdp.dmp schemas=dss
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 9.202 GB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
....
....
ORA-31694: master table "SYSTEM"."SYS_EXPORT_SCHEMA_02" failed to load/unload
ORA-31644: unable to position to block number 1 in dump file "/u10/app/ORACLE/product/10.2.0.1/rdbms/log/dssdp.dmp"
ORA-19502: write error on file "/u10/app/ORACLE/product/10.2.0.1/rdbms/log/dssdp.dmp", blockno 892675 (blocksize=4096)
ORA-27063: number of bytes read/written is incorrect
SVR4 Error: 28: No space left on device
Additional information: -1
Additional information: 262144
ORA-19502: write error on file "/u10/app/ORACLE/product/10.2.0.1/rdbms/log/dssdp.dmp", blockno 892483 (blocksize=4096)
ORA-27063: number of bytes read/written is incorrect
SVR4 Error: 28: No space left on device
Additional information: -1
Additional information: 262144

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

I am trying to export DSS schema using System account, and the DIRECTORY _NAME is DATA_PUMP_DIR


any help is appreciated..

Thanks
Ron