Procedure 5: Verifying Scsi Interface Communications; Resolving Problems Reported By The Server; Fixing Scsi Bus Errors - IBM TotalStorage 3580 L33 Setup, Operator, And Service Manual

Procedure 5: Verifying SCSI Interface Communications

The SCSI Wrap Diagnostic tests SCSI function at the device interface. However, to
thoroughly verify host-to-device communications, it is highly recommended to
exercise activity over the SCSI bus from the host to the drive and back. A
recommended utility to perform this test is the ITDT utility available on the web at
http://www.ibm.com/storage/lto. This utility is especially effective for updating the
drive firmware and for performing the Test Device function. For additional
information about using the ITDT utility, see "Updating Drive Firmware" on page
20. Perform the following steps:
1. If the ITDT utility is not installed on your system, download the appropriate
2. When installation is complete, run the SCAN (s) option to determine if your
3. Select the drive that is to be tested or to have firmware downloaded.
4. For testing, select the Test Device (t) option.
5. If allowed to complete, the test will run for at least 30 minutes. At any time an

Resolving Problems Reported by the Server

The procedure for fixing SCSI bus errors varies, depending on whether the error is
consistent or intermittent, and whether your configuration contains single or
multiple drives. The sections that follow describe how to fix each type of error.

Fixing SCSI Bus Errors

Note: If you are using a Storage Area Network (SAN) Data Gateway to convert a
Fixing a Consistent Error with a Single Drive on a SCSI Bus
1. Ensure that the power is on to the drive.
2. Ensure that the drive's SCSI address is the same as the SCSI address assigned
3. Run the SCSI wrap test (see "Function Code 6: Run SCSI Wrap Test" on page
48
IBM TotalStorage 3580 Tape Drive Setup, Operator, and Service Guide
operating system version from the web into a directory or folder of your choice
on your system.
system can detect all of the Ultrium tape drive devices (including any libraries
or autoloaders that may be on the bus).
Note: This option will perform a series of LOADS, UNLOADS, and
WRITE/READ operations. Both SCSI control and data is sent to the
device over the SCSI bus.
ABORT (a) can be entered to end the device test early if it is determined that
interface communications have been satisfactorily achieved.
drive with a SCSI interface to a Fibre Channel interface, ensure that the
problem is occurring between the SAN Data Gateway and the drive by
running the SCSI wrap test on the drive and running the SCSI loopback test
on the SAN Data Gateway. (To run the SCSI wrap test, see "Function Code
6: Run SCSI Wrap Test" on page 74; to run the SCSI loopback test, refer to
the section about that test in the IBM Storage Area Network Gateway Module
Setup, Operator, and Service Guide.)
by the server.
74).
v If the test fails, replace the SCSI terminator first, then the SCSI cable and the
interposer (if installed). Repeat the operation that caused the error. If you
replaced the SCSI terminator or SCSI cable and the problem persists, the