I'm admnistering a 350 GB Oracle 8 database. During backup datafiles ,control files & redologs are copied from one disk array to another.

Of late during backup DB writer & log writer processess are terminating the instance.

below is a part of my alert log file



Tue Sep 5 19:07:12 2006
alter tablespace MOVIMIENTOS12 begin backup
Completed: alter tablespace MOVIMIENTOS12 begin backup
Tue Sep 5 19:07:14 2006
alter tablespace IMAGENES11 begin backup
Completed: alter tablespace IMAGENES11 begin backup
Tue Sep 5 19:27:49 2006
DBW0: terminating instance due to error 27062
Instance terminated by DBW0, pid = 13928




Completed: alter tablespace INDICES77A begin backup
Mon Sep 18 19:27:08 2006
alter tablespace INDICES88 begin backup
Mon Sep 18 19:27:12 2006
Thread 1 advanced to log sequence 114798
Current log# 2 seq# 114798 mem# 0: /data/sgc/dbics/dbics06/ics.log2A
Current log# 2 seq# 114798 mem# 1: /data/sgc/dbics/admin/safety_mirror/ics.log2B
Mon Sep 18 19:27:13 2006
Completed: alter tablespace INDICES88 begin backup
Mon Sep 18 19:27:13 2006
alter tablespace MOVIMIENTOS12 begin backup
Completed: alter tablespace MOVIMIENTOS12 begin backup
Mon Sep 18 19:27:16 2006
alter tablespace IMAGENES11 begin backup
Completed: alter tablespace IMAGENES11 begin backup
Mon Sep 18 20:49:58 2006
Thread 1 advanced to log sequence 114799
Current log# 3 seq# 114799 mem# 0: /data/sgc/dbics/dbics06/ics.log3A
Current log# 3 seq# 114799 mem# 1: /data/sgc/dbics/admin/safety_mirror/ics.log3B
Mon Sep 18 21:11:28 2006
Thread 1 advanced to log sequence 114800
Current log# 1 seq# 114800 mem# 0: /data/sgc/dbics/dbics06/ics.log1A
Current log# 1 seq# 114800 mem# 1: /data/sgc/dbics/admin/safety_mirror/ics.log1B
Mon Sep 18 21:28:27 2006
Thread 1 advanced to log sequence 114801
Current log# 2 seq# 114801 mem# 0: /data/sgc/dbics/dbics06/ics.log2A
Current log# 2 seq# 114801 mem# 1: /data/sgc/dbics/admin/safety_mirror/ics.log2B
LGWR: terminating instance due to error 27062
Instance terminated by LGWR, pid = 17663



kindly advice how to deal with the problem once & for all


Regards

Msororaji