OEM issue with RMAN

Question

Hil,
OEM made RMAN work strangely.
In OEM, after I set some configuration in the "Backup Settings", I found that "Tape Drives" filed is automatically filled with the value: "1". I tested the issue on may machines and the result was the same.
Steps to generate the issue:
1. Login to the Database Control EM as SYS
2. Follow the following links:
Maintenace Tab -> Backup Settings -> Backup Set
3. Set "Maximum Backup Piece (File) Size" to 4 GB
4. Click on "Policy" link
5. Mark the checkbox "Automatically Backup Controlfile ..."
6. Set "Retain backups that are necessary for a recovery .." to 2 Days
7. Click on "OK" button
Now the settings should be saved. Click again on "Backup Settings", you will see that "Tape Drives" field is filled with "1". By the way, NO tape is installed on the machine.
On RMAN side, here is what I got:
RMAN> show all;
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 2 DAYS;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE SBT_TAPE TO '%F'; # defa
ult
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DEVICE TYPE SBT_TAPE PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE CHANNEL DEVICE TYPE DISK MAXPIECESIZE 4 G;
CONFIGURE CHANNEL DEVICE TYPE 'SBT_TAPE' MAXPIECESIZE 4 G;
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 'C:\ORACLE\ORADB10G\DATABASE\SNCFORADB.OR
A'; # default
RMAN> restore tablespace users ;
Starting restore at 13/06/07
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=143 devtype=DISK
released channel: ORA_DISK_1
RMAN-00571: ========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===========
RMAN-00571: ========================================================
RMAN-03002: failure of restore command at 06/13/2007 10:41:23
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management LibraryAs you see, although the Disk is the default channel device, RMAN is trying to use SBT_TAPE.
Oracle 10g R2 on Windows XP SP2.

Answer 1

i have seen this issue before , where oracle support suggests use
configure device type sbt clear , if you are not using media manager
or
use like , eg:
backup device type disk current controlfile
backup device type sbt current controlfile