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8-6 Troubleshooting
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
CD drives under
DOS
At this time, copied CDs are not accessible from DOS even after loading
MEGASPI.SYS and MEGACDR.SYS.
Physical drive errors To display the MegaRAID Manager Media Error and Other Error options, select
the Objects menu, then Physical Drive. Select a physical drive and press <F2>.
The windows displays the number of errors.
A Media Error is an error that occurred while actually transferring data. An
Other Error is an error that occurs at the hardware level because of a device
failure, poor cabling, bad termination, signal loss, etc.
Virtual sizing The FlexRAID virtual sizing option enables RAID expansion. FlexRAID virtual
sizing must be enabled to increase the size of a logical drive or add a physical
drive to an existing logical drive. Run MegaRAID Manager by pressing <Ctrl>
<M> to enable FlexRAID virtual sizing. Select the Objects menu, then select
the Logical Drive menu. Select View/Update Parameters. Set FlexRAID Virtual
Sizing to Enabled.
BSD Unix We do not provide a driver for BSDI Unix. MegaRAID SCSI 320-2 does not
support BSDI Unix.
Multiple LUNs MegaRAID SCSI 320-2 supports one logical unit number (LUN) per each target
ID. No multiple LUN devices are supported.
MegaRAID power
requirements
The maximum MegaRAID SCSI 320-2 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.
Table 8.4 Other Potential Problems (Cont.)
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