rman error

Experts,

i got this problem with rman. it is saying that dev4 is faild. how to resolve this problem

name=/opt/mis1/oracle/data/BBQISPRD/db15/data/BBQISPRD/BBQISPRD_bbtxn_fq200704_1e.dbf
channel dev2: starting piece 1 at 08-MAY-08
RMAN-03009: failure of backup command on dev2 channel at 05/08/2008 20:31:04
RMAN-10038: database session for channel dev2 terminated unexpectedly channel dev2 disabled, job failed on it will be run on another channel
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on dev4 channel at 05/08/2008 20:31:04
RMAN-10038: database session for channel dev4 terminated unexpectedly

Recovery Manager complete.
05/08/08 20:31:05: Job failed: notification sent
05/08/08 20:31:05: paged dba.qis.monitor@pager with message netbackup:rman:hotbackup:BBQISPRD:apollo:gold:QIS:Job failed

it there any logs to check what could be the exact problem. and why this problem comes.
what is the solution to fix the problem.
Start Free Trial