VERITAS备份ORACLE存在的问题？

通讯出错，在作业日志里面写到连接目标系统失败。
  <?xml version="1.0" encoding="UTF-16" ?>;
- <joblog>;
  <job_log_version version="1.0" />;
+ <header>;
  <filler>;======================================================================</filler>;
  <server>;作业服务器：CHUANG</server>;
  <name>;作业名称：备份 0011</name>;
  <start_time>;作业开始于：2003年12月19日，9:43:10</start_time>;
  <type>;作业类型：备份</type>;
  <log_name>;作业日志：BEX00005.xml</log_name>;
  <filler>;======================================================================</filler>;
  </header>;
- <media_drive_and_media_info>;
  来自介质装入的驱动器和介质信息：
  <drive_name>;驱动器名称：“备份到磁盘”文件夹 1</drive_name>;
  <media_label>;介质标签： B2D000002</media_label>;
  <media_guid>;介质 GUID：{C4FE0426-9EEC-498A-AE30-6912383877D1}</media_guid>;
  <media_overwrite_date>;覆盖保护直至下列时间: 9999-12-31 0:00:00</media_overwrite_date>;
  <media_append_date>;可附加直至下列时间: 9999-12-31 0:00:00</media_append_date>;
  <media_set_target>;目标介质集名称：介质集 1</media_set_target>;
  </media_drive_and_media_info>;
- <backup>;
  <filler>;======================================================================</filler>;
  <title>;作业操作 - 备份</title>;
  <append_or_overwrite>;介质操作 - 附加。</append_or_overwrite>;
  <compression>;硬件压缩已启用。</compression>;
  <filler>;======================================================================</filler>;
- <set>;
  <set_resource_name>;ORACLE_CHUANG/BOOK</set_resource_name>;
  <tape_name>;系列名称: "介质创建于 2003-12-18 16:22:25"</tape_name>;
- <volume>;
  <display_volume>;"ORACLE_CHUANG/BOOK " 的备份</display_volume>;
  </volume>;
  <description>;备份集 #4 在存储介质 #2 上备份集描述： "备份 0011"</description>;
  <backup_type>;备份类型：完全 - 备份文件- 重置归档位</backup_type>;
  <start_time>;备份已于 2003-12-19，9:43:21 开始。</start_time>;
- <directory>;
  <directory_name>;目录 \</directory_name>;
- <directory>;
- <directory>;
  <directory_name>;目录 \CWMLITE</directory_name>;
  </directory>;
  </directory>;
- <directory>;
  <directory_name>;目录 \DRSYS</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \EXAMPLE</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \INDX</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \SYSTEM</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \TOOLS</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \USERS</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \XT</directory_name>;
  <comm_failure>;连接到目标系统失败。备份集取消。</comm_failure>;
  </directory>;
  </directory>;
  <end_time>;备份已于 2003-12-19，9:52:00 完成。</end_time>;
- <summary>;
  <misc>;已备份 8 个文件来自于 9 个目录。</misc>;
  <new_processed_bytes>;已处理 610,829,008 字节，用了 8 分钟和 39 秒。</new_processed_bytes>;
  <vlm_hist_rateformat2>;吞吐量：67.3 MB/分钟</vlm_hist_rateformat2>;
  </summary>;
  <filler>;----------------------------------------------------------------------</filler>;
  </set>;
  </backup>;
- <verify>;
  <filler>;======================================================================</filler>;
  <title>;作业操作 - 检验</title>;
  <filler>;======================================================================</filler>;
- <set>;
  <set_resource_name>;ORACLE_CHUANG/BOOK</set_resource_name>;
  <description>;检验 "ORACLE_CHUANG/BOOK " 备份集 #4，在存储介质 #2 上备份集描述："备份 0011"</description>;
  <start_time>;检验已于 2003-12-19，9:52:00 开始。</start_time>;
- <directory>;
  <directory_name>;目录 \</directory_name>;
- <directory>;
- <directory>;
  <directory_name>;目录 \CWMLITE</directory_name>;
  </directory>;
  </directory>;
- <directory>;
  <directory_name>;目录 \DRSYS</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \EXAMPLE</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \INDX</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \SYSTEM</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \TOOLS</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \USERS</directory_name>;
  </directory>;
- <directory>;
  <directory_name>;目录 \XT</directory_name>;
  </directory>;
  </directory>;
  <end_time>;检验已于 2003-12-19，9:52:17 完成。</end_time>;
- <summary>;
  <misc>;已检验 8 个文件来自于 9 个目录。</misc>;
  <files_different>;0 个文件不相同。</files_different>;
  <new_processed_bytes>;已处理 610,829,008 字节，用了 17 秒。</new_processed_bytes>;
  <vlm_hist_rateformat2>;吞吐量：2056 MB/分钟</vlm_hist_rateformat2>;
  </summary>;
  <filler>;----------------------------------------------------------------------</filler>;
  </set>;
  </verify>;
+ <footer>;
  <filler>;======================================================================</filler>;
  <end_time>;作业结束于：2003年12月19日，9:52:17</end_time>;
  <engine_completion_status>;作业完成状态：失败</engine_completion_status>;
  <filler>;======================================================================</filler>;
  <completeStatus>;6</completeStatus>;
  <errorCode>;最终出错码: a000fe30 HEX</errorCode>;
  <errorDescription>;最终出错描述: 发生通讯故障。</errorDescription>;
  <errorCategory>;最终出错类别: 服务器出错</errorCategory>;
  </footer>;
  </joblog>;