Block corruption - cant restore from backup

Hi,
we have development database 11.2.0.1. There was problem with storage, and as a result there are two corrupted blocks in data files.
SQL> select * from V$DATABASE_BLOCK_CORRUPTION;
FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
6 2359942 1 0 FRACTURED
25 1855622 1 0 FRACTURED
I have scheduled weekly full backup and daily incremental backup using EM so now I want to use rman to perform media recovery on corrupted blocks. However rman says there is no backup for affected data files (see below)
RMAN> RECOVER CORRUPTION LIST;
Starting recover at 03-NOV-12
using channel ORA_DISK_1
using channel ORA_DISK_2
using channel ORA_DISK_3
using channel ORA_DISK_4
using channel ORA_DISK_5
channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00006
channel ORA_DISK_1: reading from backup piece /opt/oraBackup/rman/i2npb3o9_1_1
channel ORA_DISK_1: piece handle=/opt/oraBackup/rman/i2npb3o9_1_1 tag=BACKUP_FULL_110212103009
channel ORA_DISK_1: restored block(s) from backup piece 1
channel ORA_DISK_1: block restore complete, elapsed time: 00:42:35
channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00025
channel ORA_DISK_1: reading from backup piece /opt/oraBackup/rman/i9npbd5e_1_1
channel ORA_DISK_1: piece handle=/opt/oraBackup/rman/i9npbd5e_1_1 tag=BACKUP_FULL_110212103009
channel ORA_DISK_1: restored block(s) from backup piece 1
channel ORA_DISK_1: block restore complete, elapsed time: 00:16:35
failover to previous backup
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 11/03/2012 11:59:29
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 25 found to restore
RMAN-06023: no backup or copy of datafile 6 found to restore
I dont understand this, because the backups are performed weekly and daily and all files are at their proper location. When I check the EM backup reports, I see COMPLETED for every weekly and daily backup.
Anyone please could suggest how to repair the blocks from backups ?

Hi people, I am back to this issue. I have found this in the database
SQL> select * from v$backup_corruption;
     RECID      STAMP SET_STAMP SET_COUNT     PIECE#      FILE#     BLOCK#     BLOCKS CORRUPTION_CHANGE# MAR CORRUPTIO
         1 796949262 796948233       9293          1          6    2359942          1                  0 NO CORRUPT
         2 796953328 796949174       9300          1         25    1855622          1                  0 NO CORRUPT
         3 797035604 797034635       9318          1          6    2359942          1                  0 NO CORRUPT
         4 797039692 797035556       9325          1         25    1855622          1                  0 NO CORRUPT
         5 797134390 797121030       9343          1          6    2359942          1                  0 NO CORRUPT
         6 797137228 797134397       9368          1         25    1855622          1                  0 NO CORRUPT
         7 797739951 797725854       9590          1          6    2359942          1                  0 NO CORRUPT
         8 797744507 797739957       9597          1         25    1855622          1                  0 NO CORRUPT
         9 798340269 798330633       9794          1          6    2359942          1                  0 NO CORRUPT
        10 798343497 798340270       9801          1         25    1855622          1                  0 NO CORRUPTSo the backup contains corrupted blocks. Right ? Older backups are already gone because of retention policy.
I have set up the backup using Enterprise Manager - Schedule Backup.
What I need to know is how to avoid taking backup with corrupted blocks in future. I need such backup to fail.
Thank you for advices and regards.

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