My backups have started failing intermittently with sbt errors
It will fail on allocating channels, sometimes the first, sometimes the third. Usually, but not always I can start another backup session immediately after one fails and it will run successfully.
Any ideas?


The database in on NT 4.0 version 8.1.7
The omniback client resides on NT 4.0 version 4.1
The omniback cell server is on HP 11.0 version 4.1

Here is the error stack
RMAN-03022: compiling command: allocate
RMAN-03023: executing command: allocate
RMAN-08030: allocated channel: dev_2
RMAN-08500: channel dev_2: sid=15 devtype=SBT_TAPE
RMAN-08526: channel dev_2: MMS Version 65.4.10.176

RMAN-03022: compiling command: allocate
RMAN-03023: executing command: allocate
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03007: retryable error occurred during execution of command: allocate
RMAN-07004: unhandled exception during command execution on channel dev_3
RMAN-10035: exception raised in RPC: ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-19557: device error, device type: SBT_TAPE, device name:
ORA-27000: skgfqsbi: failed to initialize storage subsystem (SBT) layer
ORA-19511: Unknown SBT error code = 704755104, errno = 16
RMAN-10031: ORA-19624 occurred during call to DBMS_BACKUP_RESTORE.DEVICEALLOCATE

Thanks
Margaret