我的 oracle 备份的时候报错，大家帮忙看看：
channel ORA_SBT_TAPE_1: starting piece 1 at 2011-08-05:20:01:49
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup plus archivelog command at 08/05/2011 20:28:15
ORA-19502: write error on file "1vmj8lpd_1_1", blockno 89089 (blocksize=512)
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
Recovery Manager complete.
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