RMAN backup uses more space than actual DB size

Hi All,
Yesterday, we have configured the RMAN backup for an RAC db in HP-UX. The total DB size is 82GB
but the RMAN took around 250G space for backup and the backup failed. The oracle db is 10.2.0.1.
$ ls -artl
total 520626852
drwxr-xr-x 23 root root 8192 Feb 10 15:49 ..
drwxr-xr-x 2 root root 96 Feb 10 16:09 lost+found
-rw-rw-rw- 1 oracle dba 290 Feb 10 20:35 backup.log
-rw-rw---- 1 oracle dba 22768640000 Feb 10 21:30 bk_4_1_678488912
-rw-rw---- 1 oracle dba 37469036544 Feb 10 21:40 bk_3_1_678488912
-rw-rw---- 1 oracle dba 28807331840 Feb 10 21:52 bk_5_1_678490229
-rw-rw---- 1 oracle dba 22659448832 Feb 10 22:01 bk_6_1_678490845
-rw-rw---- 1 oracle dba 22775595008 Feb 10 22:14 bk_7_1_678491581
-rw-rw---- 1 oracle dba 19507593216 Feb 10 22:15 bk_8_1_678492076
-rw-rw---- 1 oracle dba 18644811776 Feb 10 22:29 bk_9_1_678492883
-rw-rw---- 1 oracle dba 19040927744 Feb 10 22:31 bk_10_1_678492958
-rw-rw---- 1 oracle dba 18791776256 Feb 10 22:44 bk_11_1_678493794
-rw-rw---- 1 oracle dba 15491096576 Feb 10 22:45 bk_12_1_678493889
-rw-rw---- 1 oracle dba 19860652032 Feb 10 23:00 bk_13_1_678494656
-rw-rw---- 1 oracle dba 20742381568 Feb 10 23:01 bk_14_1_678494701
drwxrwxrwx 3 oracle dba 1024 Feb 10 23:01 .
Why this is happening ? Any bug or i am missing out anything. Please help.
Regards,
Anand.

We are using the belwo scripts,
rman target sys/system nocatalog msglog /backup/backup.log
RUN {
ALLOCATE CHANNEL ch00 TYPE DISK;
ALLOCATE CHANNEL ch01 TYPE DISK;
BACKUP
INCREMENTAL LEVEL=0
SKIP INACCESSIBLE
TAG hot_db_bk_level0
FILESPERSET 5
FORMAT '/backup/bk_%s_%p_%t'
DATABASE;
sql 'alter system archive log current';
RELEASE CHANNEL ch00;
RELEASE CHANNEL ch01;
ALLOCATE CHANNEL ch00 TYPE DISK;
ALLOCATE CHANNEL ch01 TYPE DISK;
BACKUP
filesperset 20
FORMAT '/backup/al_%s_%p_%t'
ARCHIVELOG from time 'sysdate - 1' ;]
#For backing up the archive of the second server.
ALLOCATE CHANNEL ch02 TYPE DISK connect 'sys/system@qicdbr2';
BACKUP
filesperset 20
FORMAT 'al2_%s_%p_%t'
ARCHIVELOG from time sysdate - 1 ;
RELEASE CHANNEL ch02;
RELEASE CHANNEL ch00;
RELEASE CHANNEL ch01;
ALLOCATE CHANNEL ch00 TYPE DISK;
BACKUP
FORMAT '/backup/cntrl_%s_%p_%t'
CURRENT CONTROLFILE;
RELEASE CHANNEL ch00;
RMAN> LIST BACKUPSET SUMMARY;
List of Backups
===============
Key TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
1 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
2 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
3 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
4 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
5 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
6 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
7 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
8 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
9 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
10 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
11 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
12 B 0 A DISK 10-FEB-09 1 1 NO HOT_DB_BK_LEVEL0
RMAN> show all;
using target database control file instead of recovery catalog
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/oracle/orahome/OraRAC/dbs/snapcf_QICDB1
.f'; # default

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