Troubleshooting - IBM Ultrastar 36LP Installation And Reference Manual

IBM storage products
ServerRAID2 & 3
Operating Systems
AIX 4.3.2
HP Unix 10.10 & 10.20
IRIX 6.3 & IRIX64 6.5.4f
Linux - RedHat 6.1 & SuSE 6.1 (See Note)
Mac OS 8.0 8.5, 8.6 & 9
Novell Netware v5
MS DOS 6.22
OS/2 Warp4
Note: Linux Kernel requires the aic7xxx (Adaptec) driver to be at level 5.1.22 or greater (all compatibility
testing performed at 5.1.28). Some Linux Kernels may not contain drivers to support OEM SCSI cards.
Check with your Linux supplier for SCSI card hardware compatibility.
D. Troubleshooting
Following is a useful checklist to assist in rectifying common SCSI problems:
ü SCSI ID (device address):
Ÿ
Each device must have a unique SCSI ID.
Ÿ
Recommended SCSI ID for the boot device is 0.
ü Interface type:
Ÿ
If you have more than one SCSI device on the cable, make sure that all devices are of the same
type.
Ÿ
High Voltage Differential (HVD) SCSI devices are not compatible with single-ended (standard) or
Low Voltage Differential (LVD) SCSI devices.
ü Termination:
Ÿ
SCSI systems should have termination at both ends of the cable. Make sure that the controller
terminates one end of the cable and that a drive supplies termination at the other end. If a drive
doesn't have onboard termination, a terminator should be placed on the last connector of the
cable.
Ÿ
Make sure that there is no extra cable after the terminator at the end.
Ÿ
Any device attached that is not at the end of the cable must have internal termination disabled.
Ÿ
For adapters with multiple SCSI ports with differing performance, ALL ports must be correctly
terminated.
Ÿ
For adapters with a common port with both internal and external connections in use, DO NOT
enable termination on the controller.
Ÿ
Narrow (50 pin) devices SHOULD NOT be connected at the end of a wide (68 pin) SCSI cable.
A terminator in a 50 pin SCSI device cannot provide the correct termination for the unused data
lines.
Ÿ
Using a 68-50 pin cable converter to connect a 68 pin drive to a 50 pin SCSI adapter could cause
problems because the 68-50 pin cable converter leaves 18 of the 68 pins on the drive without
termination.
IBM Technology Group Support Center
SCO Unixware 7 & 7.1.1
SCO OpenServer Desktop 5.0.0 & 5.0.2
Solaris 2.6 & 7
Windows NT v4.0 (with Service Pak 5&6a)
Windows 95
Windows 95 (OSR2 OSR2.1)
Windows 98 & Windows 98 (SE)
Windows 2000 x86 Professional (Build 2195)
Windows 2000 x86 Prof Checked (Build 2195)
Windows 2000 x86 Server (Build 2195)
Windows 2000 x86 Adva. Server (Build 2195)
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