Not knowing what platform/version I'm guessing AIX and Oracle 8.

In addition to the suggestions you already have received...... and noting
nothing has changed

1) Check to see if oracle was relinked........ I believe the default oracle stub
     for libobk.a may write to disk by default. You may have to relink the 
correct
    one.
2) Check oracle environmental variables..... identify the location of your logs
3) Check the sbtio.log

Hope this was of some assistance...............

"Jordan, Chris (ELS)" wrote:

> RMAN backups have been working well for 3 months..... but 3 days ago they
> just stopped working. Of course, "nothing has changed". ADSM is calling the
> RMAN script with no problems, sees communication from the RMAN node
> correctly, and records the completion of the RMAN commands correctly with no
> problems.
>
> But the client end shows RMAN failure messages like:
>         RMAN-10035 operation failed
>         ORA-19506 failed to create sequential file
>         ORA-27006 sbtremove returned error
>
> The last two Oracle describe as backup storage operation failures.
>
> Is it a problem at the RMAN end, or at the ADSM end?? ADSM V3.1.2.20
>
> We have tried the backup interactively - same problems.
> We have switched the RMAN backup from allocating an ADSM channel to
> allocating a disk - and the backups completed successfully.
> What should we now do to ADSM??
>
> Cheers, Chris