TSM oracle备份 出错

每天备份归档正常，但是每周全备数据库时报错，数据400多G数据，暂时走的是TCP/IP，
请教各位神人？？


released channel: c1
released channel: c2
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on c1 channel at 12/20/2011 19:32:54
ORA-19502: write error on file "dbfull_770412037_16_1", block number 5025505 (block size=8192)
ORA-27030: skgfwrt: sbtwrite2 returned error
ORA-19511: Error received from media manager layer, error text:
   ANS1017E (RC-50)  Session rejected: TCP/IP connection failure