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