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Other Potential Problems
DOS ASPI
CD-ROM drives
under DOS
Physical Drive Errors
Virtual Sizing
BSD Unix
Multiple LUNs
MegaRAID Power
Requirements
SCSI Bus
Requirements
Topic
MEGASPI.SYS, the MegaRAID DOS ASPI manager, uses
6 KB of system memory once it is loaded.
At this time, copied CDs are not accessible from DOS even
after loading MEGASPI.SYS and AMICDROM.SYS.
To display the MegaRAID Manager Media Error and Other
Error options, press <F2> after selecting a physical drive
under the Physical Drive menu, selected from the Objects
menu. 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.
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.
We do not provide a driver for BSDI Unix. MegaRAID
does not support BSDI Unix.
MegaRAID supports one LUN per each target ID. No
multiple LUN devices are supported.
The Maximum MegaRAID power requirements are 15
watts at 5V and 3 Amps.
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.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.
Information
Chapter 8 Troubleshooting
113
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