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7-6 Troubleshooting
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
MegaRAID power
requirements
The maximum MegaRAID SCSI 320-0 power requirements are 15 W at 5 V
and 3 A.
SCSI bus
requirements
The ANSI specification dictates the following:
· The maximum signal path length between terminators is 3 meters when
using up to 4 maximum capacitance (25 pF) devices and 1.5 meters when
using more than 4 devices.
· SCSI devices should be uniformly spaced between terminators, with the end
devices located as close as possible to the terminators.
· The characteristic impedance of the cable should be 90 +/- 6 ohms for the
/REQ and /ACK signals and 90 +/- 10 ohms for all other signals.
· The stub length (the distance from the controller's external connector to the
mainline SCSI bus) shall not exceed 0.1m (approximately 4 inches).
· The spacing of devices on the mainline SCSI bus should be at least three
times the stub length.
· All signal lines shall be terminated once at both ends of the bus powered
by the TERMPWR line.
Windows NT
Installation
When Windows NT is installed using a bootable CD, the devices on the
MegaRAID SCSI 320-0 will not be recognized until after the initial reboot. The
Microsoft documented workaround is in SETUP.TXT. SETUP.TXT is on the CD.
To install drivers when Setup recognizes one of the supported SCSI host
adapters without making the devices attached to it available for use:
1. Restart Windows NT Setup.
2. Press <F6> to prevent Windows NT Setup from performing disk controller
detection when Windows NT Setup displays the following:
Setup is inspecting your computer's hardware configuration...,
This allows you to install the driver from the drivers disk you created. All
SCSI adapters must be installed manually.
3. Press <S> to display a list of supported SCSI host adapters when Windows
NT Setup displays the following:
Setup could not determine the type of one or more mass storage devices
installed in your system, or you have chosen to manually specify an
adapter,
4. Select Other from the bottom of the list.
5. Insert the drivers disk you made when prompted to do so and select Mega-
RAID SCSI 320-0 from this list.
In some cases, Windows NT Setup repeatedly prompts to swap disks.
Windows NT will recognize any devices attached to this adapter.
6. Repeat this step for each host adapter not already recognized by Windows
NT Setup.
Table 7.4 Other Potential Problems (Cont.)
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