networker 备份出错

数据库全备。错误如下，偶尔也会有成功，多数是失败。显示成功的时候，持续了6个多小时，但是显示已取消输出字节。那这个算是成功全备了吗？失败的几次，也都是持续好几个然后失败。

RMAN-03009: failure of backup command on t1 channel at 11/14/2016 02:35:12

ORA-19502: write error on file "fwskfullbak1_94rkrvvb_68900_927858667", blockno 10900481 (blocksize=512)

ORA-27030: skgfwrt: sbtwrite2 returned error

ORA-19511: Error received from media manager layer, error text:

   asdf_output_section1() failed

xdr=0x110716150: bp=0x1107162b0: send_len=262144: type=12800: fhand=0x1107164d0: wrapper=0x1107164f0: directp=0x110716550 (1:4:32)

Recovery Manager complete.

The backup process failed:

RMAN exited with return code '1'.

Exiting with error:

RMAN exited with return code '1'.

这个   error text：asdf_output_section1() failed 有什么作用？可以根据这个了解原因？该怎样对这个错误文本入手呢？EMC有错误代码查询支持什么的吗？

软件分析对比备份集时间过长？set limit channel 可以限制备份集大小？