[Networker] Oracle RMAN Media Error

HI networkers,

I'll appreciate any help on a very weird situation Im having...

LEGATO SERVER:  Sun E450 / Solaris 7 (32 Bits) / Networker 6.1.1
NETWORKER MODULE FOR ORACLE:  NSRNMO 3.5
DATABASE:  Oracle 8.1.7 (32 Bits)
TAPE UNIT:  Sun L-280 Autoloader - (1) DLT7000 Tape Drive.
ST.CONF:    "SUN  DLT7000", "Sun DLT7000", "DLT7k-data";
             DLT7k-data =  1,0x38,0,0xD639,4,0x82,0x83,0x84,0x85,2;

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When I start a manual backup using an RMAN Script which a describe:

run {
allocate channel t1 type 'sbt_tape';
backup format='backup_full_%d_%s.bak' (database);
release channel t1; }

The backup starts working OK, but after approximately 4GB after I get the
following I/O Error on the writting proccess:

Sep 26 18:02:34 bladex-450 root: NetWorker media: (warning) /dev/rmt/0cbn
writing: I/O error, at file 20 record 981
Sep 26 18:02:34 bladex-450 root: NetWorker media: (notice) dlt7000 tape
bladex_450.008 on /dev/rmt/0cbn is full
Sep 26 18:02:34 bladex-450 root: NetWorker media: (notice) dlt7000 tape
bladex_450.008 used 4669 MB of 35 GB capacity
Sep 26 18:04:43 bladex-450 root: NetWorker media: (notice) Volume
"bladex_450.008" on device "/dev/rmt/0cbn": Block size is 32768 bytes not
131072 bytes. Verify the device configuration. Tape positioning by record is
disabled.

When a execute a normal OS backup on the same Drive, it runs OK. I already
check the media config. on Legato and its OK. The problem only occurs when
executing an RMAN backup.

Will appreciate all your help !!!

Best regards,

Josh

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