***************************************************************************** WIN2000.TXT ***************************************************************************** Installation Guide for the LSI Logic SDMS Drivers: SYMC8XX.SYS V4.16.00 SYM_HI.SYS V4.16.00 SYM_895A.SYS V 4.16.00 SYM_U3.SYS V5.09.00 This file describes the features and use of the LSI Logic SDMS device drivers for the Windows 2000 operating system environment. SDMS drivers contain the same filename for different Windows operating systems. The driver files are packaged either in separate subdirectories based on the Windows operating system or on different flex disks. To determine the driver file for Windows 2000, note that the filename ends with ".sys". For example, SYMC8XX.SYS. (The same is true for Windows NT 4.0) To determine the operating system version, go into Windows Explorer, display the driver file, right click on the filename, click on Properties, and click on the Version tab. Finally, click on the Internal Filename in the lower section. For Windows 2000, the filename appears as filename (NT 5.0). For example, SYMC8XX.SYS (NT 5.0). This file contains these sections: Introduction for Windows 2000 Features LSI Logic Devices Supported Description Upgrading Windows NT 4.0 Server to Windows 2000 Server Installing the LSI Logic Windows 2000 Driver(s) New System Installation CD-ROM Installation Existing System Installation Windows 2000 Performance Tuning for Windows 2000 Large Block Size Support Maximum Number of Concurrent I/Os Disk Mirroring Troubleshooting Note: Instructions to upgrade a Windows NT 4.0 server to Windows 2000 are in the Troubleshooting section. ******************** Introduction for Windows 2000 ******************** Windows 2000 is an operating system designed to run on Intel-architecture processors using current technology. It provides a graphical user interface environment incorporating many high-level features (refer to the Microsoft Windows 2000 documentation for details). An I/O manager handles I/O requests in Windows 2000. To address a SCSI peripheral, the I/O manager goes through the appropriate drivers. Class drivers for hard disk, floptical, CD-ROM, printer, and scanner peripherals are provided in Windows 2000. Other class drivers, provided by peripheral manufacturers, may be added to support new devices. Tape device support is built into the operating system itself and does not require a class driver. Microsoft provides the port driver and LSI Logic provides the miniport drivers. The LSI Logic miniport drivers, SYMC8XX.SYS and SYM_HI.SYS, are bundled with Windows 2000. The LSI Logic miniport drivers, SYM_895A.SYS and SYM_U3.SYS, are non-bundled drivers. All LSI Logic miniport drivers are used to complete the path to an LSI Logic SCSI controller or processor with an optional SDMS SCSI BIOS. This document describes these drivers and their installation. * * * * * * * * * * * Features * * * * * * * * * * * * The miniport drivers support these features: o Ultra160 Data Transfers (for LSI53C1010, LSI53C1000) o Domain Validation (SYM_U3.SYS only) o Cyclic Redundancy Check (SYM_U3.SYS only) o Parallel Protocol Request (SYM_U3.SYS only) o Synchronous negotiation (including Fast SCSI/Ultra SCSI/Ultra2 SCSI) o Wide negotiation o Tagged command queuing o Multiple host adapters o Multiple Logical Unit Numbers (LUNs) o Disconnect/Reselect o Scatter/Gather o Differential support o SCSI pass-through functionality o Disk array configurations with no LUN 0 o Disk array configurations with non-contiguous LUNs o Target-initiated negotiation o Auto request sense o Maximum block size support: WIN2000 - 1 Mbyte o NVRAM support (wide/sync parameters, SCSI Host ID) * * * * * * * * LSI Logic Devices Supported * * * * * * * * * All LSI Logic devices and host adapters have undergone a name change. They have transitioned from a SYM prefix to an LSI prefix. No name changes have occurred for the SDMS Windows 2000 drivers. The SYMC8XX.SYS driver is named "Symbios 53C8XX PCI SCSI Driver" for driver installation. It supports the following devices and their associated LSI Logic host adapters: o LSI53C810, LSI53C810A, LSI53C810AE (LSI8100S, LSI8100ASP, LSI20810) o LSI53C815 (LSI815XS, LSI8150SP) o LSI53C825, LSI53C825A (LSI8250S, LSI8251S, LSI8251D, LSI8250ASP, LSI8251ASP, LSI8251AD) o LSI53C860, LSI53C860AE (LSI8600SP, LSI20860) o LSI53C875, LSI53C875E (LSI8750SP, LSI8751SP, LSI8751SPE, LSI8751D) o LSI53C876 (LSI22801, LSI22802) o LSI53C885 o LSI53C895, (LSI8951U, LSI8952U) The SYM_HI.SYS driver is named "Symbios PCI High Performance Driver" for driver installation. It supports the following device and its associated LSI Logic host adapters: LSI53C896 (LSI22910, LSI21002, LSI22902) The SYM_895A.SYS driver is named "Symbios 895A/8953U PCI SCSI Driver" for driver installation. It supports the following device and its associated LSI Logic host adapter: LSI53C895A (LSI8953U) The SYM_U3.SYS driver is named "Symbios Ultra3 PCI SCSI Driver" for driver installation. It supports the following device and its associated LSI Logic host adapter: o LSI53C1010 (LSI8955U, LSI21003, LSI21040, LSI22903, LSI22915A) o LSI53C1000 (LSI20160, LSI20160L) * * * * * * * * * * * Description * * * * * * * * * * * The SYMC8XX.SYS, SYM_HI.SYS, SYM_895A.SYS and SYM_U3.SYS drivers meet the Microsoft specification for miniport drivers. These miniport drivers allow connection of SCSI devices including disk drives, CD-ROMs, and tape drives for PCI-based machines. To support a new SCSI device, the Windows 2000 architecture requires that a class driver for that type device be present (usually supplied by Microsoft, or possibly by the peripheral manufacturer). No changes to these drivers are required. The SYMC8XX.SYS, SYM_HI.SYS, SYM_895A.SYS, and SYM_U3.SYS drivers described in this document support Windows 2000 only. There are other versions of the SYMC8XX.SYS, SYM_HI.SYS,and SYM_U3.SYS drivers that are supported under Windows NT 4.0. The SYM_895A.SYS driver is available for Windows 2000 only. Note that the SYM_HI.SYS driver supports the LSI53C895A device and LSI8953U host adapter for the Windows NT 4.0 operating system. A Windows application passes SCSI commands directly to the SCSI devices by using the SCSI pass-through facility (refer to the Microsoft Windows 2000 documentation for details). This facility allows applications to directly control and access SCSI devices by filling in a data structure and calling into the port or class driver. The SYM_U3.SYS driver supports Ultra160 SCSI protocol, providing twice the raw data transfer rate of Ultra2 protocol. Ultra160 includes double transition clocking, cyclic redundancy check, parallel protocol request, and domain validation. The standard Ultra3 SCSI protocol performs 80 megatransfers per second resulting in approximately double the synchronous data transfers rates of Ultra2 SCSI. The SYMC8XX.SYS, SYM_HI.SYS, and SYM_895A.SYS drivers support Ultra SCSI protocol, providing twice the raw data transfer rate of Fast SCSI for disk drives and LSI Logic host adapters that support Ultra SCSI. These drivers also support Ultra2 protocol, providing quadruple the raw data transfer rate of Fast SCSI. The SYM_U3.SYS driver supports Ultra160 SCSI protocol providing speeds up to 160 Mbytes/s data transfer for double transition clocking. CAUTION: Ultra SCSI requires more stringent SCSI bus cabling setups than Fast SCSI. Ultra2 and Ultra160 SCSI require low-voltage differential (LVD) termination. Note: Please keep in mind that the Windows 2000 text-mode setup only displays the driver information, and not every controller found by that driver. **** Installing the SYMC8XX.SYS/SYM_HI.SYS/SYM_895A.SYS/SYM_U3.SYS Driver **** This section provides installation instructions for new and existing systems. * * * * * * * * * * New System Installation * * * * * * * * * This procedure installs the SYMC8XX.SYS, SYM_HI.SYS, SYM_895A.SYS and/or SYM_U3.SYS drivers onto a Windows 2000 system. Use this procedure when installing Windows 2000 onto an unused SCSI drive. Windows 2000 automatically adds the driver to the registry and copies the driver to the appropriate directory. The method for installing Windows 2000 on a new system involves using a CD-ROM. Refer to the Microsoft document for installing Windows 2000 using boot floppy diskettes. CD-ROM Installation The SYMC8XX.SYS and SYM_HI.SYS drivers are bundled with Windows 2000. These drivers support the LSI53C8XX family of LSI Logic controllers, with the exception of the LSI53C895A. The SYM_895A.SYS and SYM_U3.SYS drivers are non -bundled drivers. The SYM_895A.SYS driver supports the LSI53C895A LSI Logic controller. The SYM_U3.SYS driver supports the LSI53C1010 and LSI53C1000. 1. Start the Windows 2000 installation by booting from the Windows 2000 CD-ROM: The system BIOS must support booting from a CD-ROM. SDMS SCSI BIOS settings may need to be changed to allow CD-ROM booting. 2. Press the F6 key to install the SYM_895A.SYS or SYM_U3.SYS drivers when the screen displays "Windows 2000 Setup". This must be done or else these new drivers will not be recognized. If only the SYMC8XX.SYS and/or SYM_HI.SYS drivers are needed, no user action is required as they will be loaded from the CD-ROM automatically. Note: Be sure to press the F6 key as any driver loaded later in the installation process is not recognized by the Windows setup. If F6 is not pressed, all devices controlled by the drivers are not available during Windows 2000 setup. 3. Choose S to specify an additional device when the screen displays "Setup could not determine the type of one or more mass storage devices...". NOTE: If this screen is not displayed as the first user input, then pressing the F6 key was not seen by the setup program. Reboot the system and try again. The system prompts for the manufacturer-supplied hardware support disk. 4. Insert the appropriate SDMS driver diskette containing the Windows 2000 driver required to support your LSI Logic adapter(s) and press Enter. Depending upon the media used to distribute SDMS drivers (web or CDROM), you will create an SDMS driver diskette. NOTE: If both of these SDMS drivers need to be installed, they can be installed one after the other using steps 3 through 5. Installation order is not important. NOTE: Current Windows 2000 drivers can be downloaded from the LSI Logic web site at http://www.lsilogic.com. After you are connected to this web site, place your cursor on the Get Drivers option in the menu bar. Click on the Drivers selection. Choose the Windows 2000 operating system for SCSI and click on the Go button. Follow the instructions on subsequent screens to download the drivers. 5. Press Enter to proceed. Return to the Windows 2000 Setup screen. 6. Press Enter to proceed. The message about setup loading files appears. 7. Follow the Microsoft Windows 2000 installation procedure at this point. * * * * * * * * * Existing System Installation * * * * * * * * This procedure installs or upgrades the SYMC8XX.SYS, SYM_HI.SYS, SYM_895A.SYS and/or SYM_U3.SYS drivers onto an existing Windows 2000 system. NOTE: When a LSI Logic adapter is added to an existing system installation, the new adapter is automatically detected at the next reboot. For adapters controlled by the SYMC8XX.SYS or SYM_HI.SYS drivers, the bundled driver will be loaded automatically with no user intervention. For adapters controlled by the SYM_895A.SYS or SYM_U3.SYS drivers, the Device Driver Wizard will appear at boot. Click on the Next button and continue at step 7 below. 1. Boot Windows 2000 and log on as Administrator. 2. Right click on My Computer and click on the Properties selection. Click on the Hardware tab, and then the Device Manager button. 3. Click the "+" to the left of the SCSI and RAID controllers line. Find the adapter desired for the driver upgrade and double-click the entry. Click on the Driver tab. 4. Information on the currently installed driver is displayed, and additional driver details can be viewed by clicking the "Driver Details" button. 5. To update the existing driver, click the "Update Driver" button. The Upgrade Device Driver Wizard begins. Click on the Next button. 6. Make sure "Search for a suitable driver for my device" is selected, then click Next. 7. Make sure the "Floppy disk drives" location is checked, then insert the appropriate SDMS driver diskette containing the Windows 2000 driver required to support your LSI Logic adapter(s) and press Enter. Depending upon the media used to distribute SDMS drivers (web or CDROM), you will create an SDMS driver diskette. NOTE: Current Windows 2000 drivers can be downloaded from the LSI Logic web site at http://www.lsilogic.com. After you are connected to this web site, place your cursor on the Get Drivers option in the menu bar. Click on the Drivers selection. Choose the Windows 2000 operating system for SCSI and click on the Go button. Follow the instructions on subsequent screens to download the drivers. 8. The system will scan the existing driver database and the floppy disk drive for drivers for the selected adapter. If a driver already exists on the system, and it is newer than the update driver on the driver diskette, a message is displayed giving the user the option to keep or reinstall the existing driver. In this case, if the user desires to use the upgrade driver anyway, click the "Install one of the other drivers" box, then click Next. If no current driver exists, the driver on the driver diskette is displayed. 9. Click on the Next button. A list of suitable drivers appears. The entry for the upgrade driver can be verified by scrolling the display to the right, and viewing the Location field. 10. Highlight the driver for the upgrade installation disk and click on the Next button. In some cases, a message will display saying that this driver is not digitally signed. This message informs the user that a non-signed driver is being installed and provides an opportunity for the user to cancel the installation (by clicking No). Note: Drivers are digitally signed by the Microsoft Windows Hardware Quality Lab (WHQL). Due to the time lag between the general customer release by LSI Logic of Windows drivers and the completion of WHQL testing, some drivers distributed with adapters or downloaded from the www.lsilogic.com web site may not be digitally signed. 11. Click No to cancel the installation if the nonsigned driver is not desired or click Yes to continue the installation. The system loads the driver from the driver diskette. A message box may appear indicating that the target (existing) driver is newer than the source (upgrade) driver. 12. Click No to cancel the driver upgrade at this point or click Yes to continue the installation. The system copies the driver to the system disk. For any adapter other than the boot adapter, the updated driver will become active immediately. For the boot adapter, a message box displays indicating that the system must be rebooted for the new driver to take effect. 13. Click on the Finish button to complete the driver upgrade. Note: When upgrading the driver on a multiple SCSI channel adapter, both channels of the adapter should be upgraded before the system is rebooted. Failure to do this can result in the upgraded driver being replaced by the original existing driver. * * * * * * * * Performance Tuning for Windows 2000 * * * * * * * Windows 2000 has registry entries that can be used to improve the performance of SCSI I/O for certain configurations. The tunable parameters are large transfer block size support and a guaranteed number of concurrent I/Os for a particular SCSI bus. * * * Large Block Size Support * * * The SYMC8XX.SYS, SYM_HI.SYS, SYM_895A.SYS, and SYM_U3.SYS drivers can support up to a 1 Mbyte transfer size in Windows 2000, however the default transfer size is limited to 64 Kbytes. To enable a larger transfer size, an entry must be added to the registry, using the file sym_256K.reg. This file will set a 256 Kbytes maximum, but it can be edited to set other desired maximum transfer sizes. Important: Be sure to read the information in the sym_256K.reg data file before editing it. Choose one of two methods to add this registry setting: 1. Locate the sym_256K.reg data file (supplied with the driver files) using Windows Explorer and double click on the file. -or- 2. Type at the command prompt: regedit sym_256K.reg This inserts an entry in the registry to enable 256K block size support. Editing the SYM_256K.reg file can set any maximum block size between 64 Kbytes and 1 Mbyte (-8 Kbytes). The formula to calculate the proper value for MaximumSGList is: MaximumSGList = (Maximum Block Size)/4K +1 For 256 Kbytes: 256K/4K = 64 Kbytes, add 1 for 65 (decimal) or 0x41(hexadecimal). The maximum value allowed for MaximumSGLIst is 255 or 0xFF. This denotes an absolute maximum transfer size of 1040384, which is 8 Kbytes less than 1 Mbyte (1040384/4K = 0xFE, add 1 for 0xFF or 255). The system must be rebooted for the new registry setting to be effective. To reset the maximum block size to the default of 64 Kbytes, follow the instructions above, except use symdfblk.reg as the data file. * * * Maximum Number of Concurrent I/Os (Guaranteed) * * * Windows 2000 only guarantees a maximum of 32 concurrent I/Os active on a particular SCSI bus. However, due to the method of memory allocation, the actual limit of concurrent I/Os can vary greatly between various drivers or versions of drivers. This can have a huge impact on performance benchmarking between different driver versions or adapter vendors. In effect, one adapter may actually be able to have 70 or 80 I/Os outstanding, while another adapter could only have 32. This can also affect systems with high performance storage subsystems, such as disk arrays. In order to have a guaranteed number of concurrent I/Os, an entry must be added to the registry, using the file sym100io.reg. Important: Be sure to read the information in the sym100io.reg data file before editing it. Choose one of two methods to add this registry setting: 1. Locate the sym100io.reg data file (supplied with the driver files) using Windows Explorer and double click on the file. -or- 2. Type at the command prompt: regedit sym100io.reg This inserts an entry in the registry to guarantee a maximum of 100 concurrent I/Os per adapter. If a maximum other than 100 is desired, the sym100io.reg file can be edited. The system administrator should be aware that increasing the number of concurrent I/Os from the default of 32 will use increasing amounts of non-paged pool memory. High values for this setting can degrade system performance. The system must be rebooted for the new registry setting to be effective. To reset the guaranteed number of concurrent I/Os to the default of 32, follow the instructions above, except use symdefio.reg as the data file. * * * Auto Request Sense * * * Enabling and Disabling Auto Request Sense is found in the section titled "Troubleshooting." * * * * * * * * * * * Disk Mirroring * * * * * * * * * * Note: This section applies only to Intel x86-platforms where the SDMS 4.XX PCI SCSI BIOS is used. The SDMS 4.XX PCI SCSI BIOS loads only one image into the system memory at boot time regardless of how many host adapters are used in the system. All of the disk drives on all host adapters will be recognized through the INT13h function call. Because of this implementation, disk mirroring under Windows 2000 needs to be done by following instructions which might be different from the Microsoft documentation. To create an Windows 2000 Fault Tolerant (FT) floppy diskette so that you can boot from the mirrored partition in case the primary partition fails, follow these steps: 1. Format a floppy diskette in drive A: using Windows 2000 (Windows Explorer or My Computer) for use as a Fault Tolerant boot floppy. 2. From the root directory of the primary partition, copy NTLDR, NTDETECT.COM, and BOOT.INI to this floppy diskette. 3. Temporarily remove the read-only attribute of the BOOT.INI file so that it can be modified and saved. 4. Edit the BOOT.INI file on the FT floppy diskette and modify the following line where you want to boot the mirrored partition: multi(0)disk(0)rdisk(x)partition(y)\ where: multi(0) and disk(0) should always remain same. x = the drive number of the mirrored partition in the INT13 chain minus 80h. The drive number of the mirrored partition can be found during system bootup of the SDMS 4.XX PCI SCSI BIOS when the primary partition does not exist. It should say either BOOT (=80h), 81h, 82h, and higher. Therefore, the value of x would be 0 when BOOT, 1 when 81h, 2 when 82h, etc. y = the partition number on the drive (starts at 1 which equals single partition on the drive) The next example provides a scenario to better illustrate the above information. EXAMPLE: Two LSI Logic 8xx host adapters are in the system. The first HBA, HBA #0 which is the boot path, has two SCSI hard drives on ID 0 and ID 5. The second host adapter,HBA #1, has two SCSI hard drives on ID 2 and ID 4. Assuming that the SCSI bus scan starts from ID 0 and goes up, the drive number of INT13h will look like this: HBA #0, ID 0= BOOT (which is 80h) HBA #0, ID 5= 81h HBA #1, ID 2= 82h HBA #1, ID 4= 83h Now Windows 2000 is installed on the boot drive, HBA #0 ID 0, and a mirrored partition is established on HBA #1 ID 2. If the primary partition fails, for example due to power failure, then the drive number of INT13h will change: HBA #0, ID 5= BOOT (which is 80h) HBA #1, ID 2= 81h HBA #1, ID 4= 82h Therefore, the following line should be used in the BOOT.INI file on the Windows 2000 Fault Tolerant boot floppy to boot from the mirrored partition, HBA #1 ID 2. Note that rdisk(1) was calculated from x=81h minus 80h. multi(0)disk(0)rdisk(1)partition(1)\ 5. Save the BOOT.INI and restore the "read-only" attribute. * * * * * * * * * * Troubleshooting * * * * * * * * * * * Some potential problems and their suggested solutions are: * * * Problem * * * Upgrading Windows NT 4.0 Server to Windows 2000 Server * * * Solution * * * Follow these steps to retain file folders created within Windows NT: 1. Boot your Windows NT 4.0 computer. The system displays your computer's desktop. 2. Insert the Windows 2000 installation CD-ROM. The system prompts to ensure you want to upgrade your server. 3. Reply yes. A window appears and asks if you want to upgrade to Windows 2000. 4. Click on the Next button. The system prompts with a license agreement. 5. Read the license agreement and select the radio button that reads "I accept this Agreement." 6. Click on the Next button The system prompts for the serial number. 7. Type in the serial number assigned to your installation CD-ROM. 8. Click on the Next button The Select Special Options window may appear. If so, make the applicable settings, then click on the Next button. The system copies the files and then prompts to reboot your computer. 9. Reboot your computer and leave the Windows 2000 installation CD-ROM in your CD-ROM drive. The system boots up your computer using the Windows 2000 CD-ROM. 10. Press the F6 key when the screen displays: "Setup is inspecting your computer's hardware configuration." Be sure to press the F6 key to load the nonbundled drivers. For example, the SYM_U3.SYS driver. 11. Choose S to specify an additional device when the screen displays "Setup could not determine the type of one or more mass storage devices...". The system prompts for the manufacturer-supplied hardware support disk. 12. Insert the appropriate SDMS driver diskette containing the Windows 2000 driver required to support your LSI Logic adapter(s) and press Enter. Return to the Windows 2000 Setup screen 13. Press Enter to proceed. The message about setup loading files appears. The system prompts with another license agreement. 14. Click on the agreement selection. The system displays partition table information. 15. Press Enter. The system prompts to continue setup. 16. Press C. 17. Select a new location to install Windows 2000 so that it does not overwrite the information in the Windows NT section of your hard drive. For example, the WINNT location appears. 18. Press Esc to use a different location 19. Type in WIN2K so system creates a new folder 20. Press Enter. 21. Follow the Microsoft Windows 2000 installation procedure at this point. When the installation has completed, you can move the files from the Windows NT (WINNT) folders to appropriate folders within the Windows 2000 folder. * * * Problem * * * During installation, no SCSI devices are found. * * * Solution * * * a. Ensure that the custom setup is chosen on the Setup Method screen. b. Ensure that all devices are powered on and terminated correctly. c. Check that no devices have duplicate SCSI IDs. d. Make sure INT A is assigned for the PCI slot(s) where your SCSI host adapter(s) are installed. e. Ensure that all devices can be seen in the display banner of the SDMS SCSI BIOS at boot time. * * * Problem * * * System crashes during installation with a message indicating inaccessible boot device. * * * Solution * * * a. This error is usually associated with an IRQ, DMA channel, I/O (chip) address, or BIOS address conflict. Set the SCSI host adapter to use a different interrupt. b. A virus sometimes causes this error that infects the Master Boot Record of the boot device. Use a write-protected DOS bootable flex containing virus scanning and cleaning software to check for any viruses on the boot device, and remove if any are found. * * * Problem * * * A disk drive is recognized as seven different devices when only one is physically connected to the SCSI bus. * * * Solution * * * Older SCSI devices that incorrectly indicate to Windows 2000 that they support multiple LUNs usually cause this error. Contact the device manufacturer for a firmware upgrade. * * * Problem * * * Problems with SCSI devices installation or operation * * * Solution * * * If a SCSI device is not operating properly (either the device is not found or a SCSI interface error occurs during scanning), it is possible that the third-party device drivers do not support the auto request sense feature of LSI Logic host adapters. Disable the auto request sense feature as described below and try the device operation again. a. To disable the auto request sense feature, use the symno_ar.reg file (supplied with the SDMS driver installation files), and double click on the file in Windows Explorer; -or- Type at the command prompt: regedit symno_ar.reg This inserts a registry entry that disables the auto request sense feature. The system must be rebooted for this change to take effect. b. To re-enable the auto request sense feature, use the file "sym_auto.reg" and perform one of the update methods described in the preceding paragraph. * * * Problem * * * Problems with certain SCSI devices when using an Ultra SCSI adapter. * * * Solution * * * a. Some SCSI devices do not function properly when the adapter attempts to negotiate Ultra SCSI transfer rates. If a device is not operating properly, check the transfer speed setting using the SDMS 4.XX PCI SCSI BIOS Configuration Utility (press Ctrl-C when the LSI Logic SDMS PCI BIOS banner appears during the system boot process). Devices that do not support Ultra SCSI should be set to a maximum of 10 Mbytes/s for 8-bits, and 20 Mbytes/s for 16-bits. * * * Problem * * * Problems with Ultra160 SCSI devices using Ultra160 SCSI protocol. * * * Solution * * * a. If the system is configured with a LSI Logic host adapter that supports Ultra160 SCSI and an Ultra160 SCSI device is on the SCSI bus, intermittent problems and possible system crashes can occur if the SCSI bus cable and terminators do not conform to the Ultra160 SCSI specification. b. Disable Ultra160 SCSI support for all devices using the SDMS 4.XX PCI SCSI BIOS Configuration Utility (press Ctrl-C when the LSI Logic SDMS PCI BIOS banner appears during the system boot process). c. If the system operates properly without Ultra3 SCSI enabled, it is highly likely that the SCSI bus cable and terminators are not configured correctly for Ultr160 SCSI. See the LSI Logic host adapter user's guide for information on Ultra160 SCSI cabling requirements. * * * Problem * * * The system hangs at boot, has a long boot time, or SCSI device not available. Some older SCSI devices do not tolerate Domain Validation operations. At system boot time, Domain Validation is performed to test the data integrity of the SCSI bus between the host adapter and each target device. With some older SCSI devices, these operations can cause the device to stop responding to SCSI commands. * * * Solution * * * Disable Domain Validation, either for a specific SCSI target or all adapters controlled by a specific driver. a. To disable Domain Validation for a specific SCSI target, use the SDMS 4.XX PCI SCSI BIOS Configuration Utility to set the Sync Rate to 0 (async) and the Data Width to 8. This target will be running in async/narrow mode and no Domain Validation operations will be performed on it. b. To disable Domain Validation for all host adapters controlled by this driver, use the file symno_dv.reg (supplied with the SDMS driver files). Either double click on the file in Windows Explorer or My Computer or type "regedit symno_dv.reg" at the command prompt. This inserts a registry entry that disables Domain Validation operations. The system must be rebooted for this change to take effect. c. To re-enable the Domain Validation feature, use the file "sym_domv.reg" and perform one of the update methods described in the preceding paragraph.