Does anyone have any experience troubleshooting an error 24  with backup
Oracle  RMAN

        RMAN-08504: input archivelog thread=1 sequence=78372 recid=87221
stamp=510913205
RMAN-00569: ================error message stack follows================
RMAN-03007: retryable error occurred during execution of command: backup
RMAN-07004: unhandled exception during command execution on channel t1
RMAN-10032: unhandled exception during execution of job step 1: ORA-06512:
at line 85
RMAN-10035: exception raised in RPC: ORA-19624: operation failed, retry
possible
ORA-19506: failed to create sequential file, name="al_29254_1_510916330",
parms=""
ORA-27007: failed to open file
SVR4 Error: 17255796: Unknown system error
Additional information: 7009
Additional information: 1
ORA-06512: at "SYS.DBMS_BACKUP_RESTORE", line 408
RMAN-10031: ORA-19624 occurred during call to
DBMS_BACKUP_RESTORE.BACKUPPIECECREATE


Renato B. Fabene
renato.fabene AT primesys.com DOT br
Tel: 00 55 19 3272-9377 r: 200
Fax: 00 55 19 3272-9377 r: 211
Rua: Romualdo Andreazzi,545 - Campinas - SP