我这边的用的是570的小机、IBM fast 600、一台光纤交换机，应用和数据库在同一个小机上面。IBM3582+TSM进行备份，但是现在总是出现这样的问题的，是不是共用一个SCSI设备的问题？
channel ch00: starting piece 1 at 18-JAN-07
released channel: ch00
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch00 channel at 01/18/2007 21:10:23
ORA-19502: write error on file "ORA_612219606_3369_1.bak", blockno 18945 (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

ANS1017E Session rejected: TCP/IP connection failure
Explanation: An attempt to connect to the server using TCP/IP communications failed. This error can occur if the LAN connection went down or if your system administrator canceled a backup operation.
System action: Session rejected. Processing stopped.
User response: Retry the operation, or wait until the server comes back up and retry the operation. If the problem continues, see your system administrator for further help.

我这边的LAN没问题，且没有人工去停止!

我之前也遇到过这样的问题。
你是不是用TSM的调度来做呢？如果是，那么你是不是dsmc schedule进程没有起啊？
尝试下直接执行备份脚本？

把操作系统重新启动一次，肯定就可以备份，我前几天才遇到这个问题，整了几天都不知道什么原因引起的，整个系统CPU和内存，系统性能都是正常的，

是用调度做的，但看调度进程在呀？