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
收起