IBM System Storage TS3310, Maintenance Information

Page: 481 / 531

v If the test is successful, go to step 6.
6.
Check the Fibre Channel cable connection at the server.
7. Using a device driver utility such as ntutil or tapeutil , verify that the drive is
properly configured and available at the server.
8. If the problem persists, the fault may be with the server's hardware or software.
Refer to your server's service manual.
9. When the problem is corrected (or determined to be a server problem), restore
all of the fiber cables to their correct position.
Fixing Intermittent Fibre Channel Errors
1. Determine the type of Fibre Channel topology that you are using.
2.
Ensure that the configuration and software levels are supported.
a. Determine the current software levels by selecting Reports->Library
Configuration .
b. Download the latest levels of software by visiting http://www.ibm.com/
storage/lto .
3. Check that each Fibre Channel cable does not exceed 500 m (1640 ft).
4. Ensure that all Fibre Channel cables are installed correctly.
5. Using this guide or the service guides of associated switch, hub, or fiber
products, determine that a problem exists between the drive, drive cable, and
the device to which they attach. Try to isolate which part of the Storage Area
Network (SAN) is experiencing problems.
6. Using this guide or the service guides of associated switch, hub, or fiber
products, verify that the SAN configurations are correct (such as switch zoning
for drive sharing).
7.
Obtain all errors reported by the drive to the server (see “Using Host Sense
Data” on page D-50), then contact your OEM Product Application Engineer
(PAE) for error analysis.
Fixing SAS Interface Problems
If your drive is attached to the host through a SAS cable to a host bus adapter
(HBA), the following procedures will assist you isolation and correction of any
interface problems. SAS attachment requires no topology changes as is found in
fibre channel attachment, and requires no external termination as is required in
SCSI attachment. In addition, SAS drives are attached individually to the HBA,
either through a one-to-one connection or through an interposer. You need not
worry about another drive causing this drive to fail. As such, SAS attachment is by
far the easiest interface to understand and to correct problems.
Currently, the SAS interface provides 3 Gb/s maximum speed over the interface. In
the future, the ability to perform a diagnostic wrap of the signal will be provided.
In the meantime, isolation will depend upon whether the problem is solid or
intermittent. If the problem you are having is solid, refer to “Fixing a Solid Error
with One Drive on a SAS Connection”. If the problem you are having is
intermittent, refer to “Fixing an Intermittent Error with One Drive on a SAS
Connection”.
The LTO-4 SAS drives use an SFF-8088 type connector. Each SAS tape drive should
be connected directly to a SAS host bus adapter (HBA) using one SAS cable. The
library does not support the use of SAS expander devices or cables at this time.
Appendix D. Using Ultrium Drives
D-57