tsm备份oracle报错

最近备份数据库报错（有时候又能成功）

网上找了一些资料说是修改时间相关参数，我也修改了，可是还是报错。不知道哪儿的问题。

请各位大神帮忙看看怎么解决这个问题？谢谢各位大哥

错如下：

RMAN-03009: failure of backup command on t6 channel at 12/12/2015 15:19:59

ORA-19502: write error on file "level1_REP_db_upqokvfp_1_1_20151212_3033_1", block number 289 (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.

released channel: t1

released channel: t2

released channel: t3

released channel: t4

released channel: t5

released channel: t6

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of release command at 12/11/2015 18:23:51

RMAN-06012: channel: t1 not allocated