RMAN error (ORA-19502)

Hello,
 
There is a problem with one of backups for 9.2.0.6 (64-bit) database on AIX 5.3 
- 01. The RMAN backup script sends the following error:
 
released channel: ch00
released channel: ch01
released channel: ch02
released channel: ch03
released channel: ch04
released channel: ch05
released channel: ch06
released channel: ch07
released channel: ch08
released channel: ch09
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch04 channel at 05/29/2007 04:51:58
ORA-19502: write error on file "blmerq01.daily_hot_appl.0705290106_s5923", 
blockno 6864385 (blocksize=512)
ORA-27030: skgfwrt: sbtwrite2 returned error
ORA-19511: Error received from media manager layer, error text:
   VxBSASendData: Failed with error:
   Server Status:  Communication with the server has not been iniatated or the 
server status has not been retrieved from the server.
 
RMAN>
 
Recovery Manager complete.
 
 
The script backups datafiles to tapes using VERITAS NetBackup for Oracle - 
Release 5.1
The channels are allocated using the command:
ALLOCATE CHANNEL ch<n> TYPE 'SBT_TAPE' trace=2;
trace=2 was added to get additional info
 
The tracing generates trace files with the error:
 
entering sbterror on line 2692
return from sbterror on line 2703
SKGFQ OSD: Error in function sbtwrite2 on line 1034
entering sbterror on line 2692
return from sbterror on line 2703
SKGFQ OSD: Error in function sbtclose2 on line 1304
 
 
Does anybody know something about the problem or how to reveal it?
 
Thank you very much,
Andrey Goryunov
 
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