I am using the TSM oracle backup the following error is usually reported.   
  channel t1: starting piece 1 at 19-JUL-07
  released channel: t1
  released channel: t2
  RMAN-00571: ===========================================================
  RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
  RMAN-00571: ===========================================================
  RMAN-03009: failure of backup command on t2 channel at 07/19/2007 05:56:47
  ORA-19502: write error on file "df_FCMFIN_1118_1", blockno 9217 
(blocksize=512)
  ORA-27030: skgfwrt: sbtwrite2 returned error
  ORA-19511: Error received from media manager layer, error text:
     ANS1312E (RC12)   Server media mount not possible
   
   
  Does anybody have idea of this issue

       
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