User's Manual

hp StorageWorks File System Extender User Guide 197
SCSI problems
Description On a consolidated FSE implementation or an FSE server, major problems with FSE drives are
experienced (Windows-system specific).
Explanation See Workaround.
Workaround Check the FSE error log for the following message:
Access to SCSI device is prevented. Make sure that the device
driver is disabled.
If this error message is logged, the cause of the problem with the FSE drive is the operating
system driver for the tape drive, which has not been disabled.
For information on disabling the device drivers for tape drives, see the FSE Installation Guide.
Description Random failures with tape drives or tape library.
Explanation On highly loaded systems, SCSI resets may happen on the SCSI bus. This may lead to some
low-level problems with the attached devices (tape library or drives).
Workaround Consider using dedicated SCSI bus (card) for connecting the tape library to your system (and
use other SCSI buses/cards for drives). In case of repeated failures, check the cabling (shielded
cable is recommended), SCSI terminators (active terminators are recommended) and the power
supply.
Description A device connected to the SCSI or Fibre Channel HBA does not work correctly. Some operations
are faulty or do not work.
Explanation The root cause of the problem may be that your HBA does not support direct SCSI pass-through
mode, the default mode for SCSI operation used in the FSE implementation.
Workaround Verify that you have the latest driver version for your HBA installed on the system. If not, update
the driver.
If the problem persists, use the HSM_PT_DIRECT variable to enable buffered SCSI
pass-through mode. For instructions on how to do this, see ”HSM_BEA_VERIFY_POSITION” on
page 228.