Table 8.4

Other Potential Problems (Cont.)

 

 

 

Topic

 

Information

 

 

CD drives under

At this time, copied CDs are not accessible from DOS even after loading

DOS

 

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

The maximum MegaRAID SCSI 320-2 power requirements are 15 W at 5 V

requirements

 

and 3 A.

 

 

 

SCSI bus

 

The ANSI specification dictates the following:

requirements

 

• 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.

 

 

 

8-6Troubleshooting

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