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† This length can be extended to 25 meters if there are only 2 devices (e.g., the controller and one drive) on the bus in a point-to-point configuration. Manual No. 775051 Limitations on Mixing SCSI Drives Limitations on Mixing SCSI Drives Do Not Mix Narrow and Wide SCSI Drives . Note Do not mix narrow and wide SCSI devices on any of your SCSI channels. In some cases, this may cause signal degradation. Mixing LVD with Single-ended Drives If LVD capable drives are installed on a channel with single-ended devices, all drives on the channel will operate as if they were single-ended devices. This will also limit the bus length to the single-ended bus length specified in Table 2-5. AcceleRAID 352 Installation Guide Chapter 3 Controller Start-up This chapter describes: • BIOS Options • BIOS Configuration Utility (RAID EzAssist) • Operating System, Device Drivers, GAM • What to Check in Case of Problems This chapter describes the AcceleRAID 352 RAID controller start-up procedures and messages produced by the BIOS during start-up or re-boot. This chapter also explains three BIOS options that are available for configuring controller operation. BIOS Options After physically installing the controller and connecting the cabling, do the following steps if you need to set or modify the BIOS options (see “Setting BIOS Options” on page 3-2 for details): 1. Power on the computer. 2. Watch the messages on the screen for the following prompt to be displayed: Press for BIOS options 3. Press Alt–M to get into the BIOS Options menu. 4. The BIOS Options menu provides the following items to choose from: 5. To select any of the items in the menu, highlight the selection with the Up Arrow or Down Arrow. Press Enter to toggle any of the 3 items. . Note BIOS must be enabled to toggle the CD-ROM boot and the Drive geometry parameters. Manual No. 775051 BIOS Options Setting BIOS Options The available BIOS options are: • BIOS disabled / enabled • CD-ROM boot disabled / disabled • 2GB / 8GB drive geometry BIOS Disable or Enable This option must be enabled in order to toggle the CD-ROM boot and the drive geometry parameters shown in the BIOS Options menu. The BIOS must also be enabled in order to boot from any device (e.g., CD-ROM) or system drive configured on the controller, or to access any DOS partition on any drive configured on the controller. When BIOS Disable or Enable is selected, the following message will be displayed. Pressing any key will restart the system. CD-ROM Boot Disable or Enable The default for this option is for the CD-ROM boot to be disabled (e.g., the system will boot from a hard drive, even if there is a bootable CD installed. If the CD-ROM boot option is enabled, and if a bootable CD is installed in the CD-ROM drive, the system can boot from the CD, you will also get an option to bypass the CD-ROM boot feature. If the CD-ROM boot option is enabled, the CD-ROM will take priority over the disk drives. For example, under MS-DOS, the disk drive that is normally Drive C will become Drive D. All subsequent drive IDs will similarly be moved down. AcceleRAID 352 Installation Guide Controller Start-up Enable 8GByte or 2GByte Drives This setting affects how the BIOS reads the disk drives for the boot partition. Drive geometries can be toggled between 8 GB and 2 GB. The default is 2 GB. When the drive geometry is changed, the drive should be formatted at the operating system level. Caution Changing this setting after data has been stored will make the data unreadable. If you have already configured your array and have stored data, you should not change this setting. The default BIOS geometry of the controller is set to 2 GB. This means that the BIOS can only access the first 2 GB of any drive that has been configured on the controller. This is adequate in most applications, since BIOS is only used to boot the operating system. However, it does mean the operating system must be installed in the first 2 GB of the capacity of the configured drive. If this is not adequate, the BIOS geometry can be changed to 8 GB, allowing the BIOS to access the first 8 GB of capacity. As a rule of thumb, select 8 GB geometry if the following two cases apply: 1. You have a system (RAID) drive that is greater than 2.145 GB in capacity. 2. The DOS/Windows compatible partitions could be located in an area above the first 2.145 GB. Otherwise the 2 GB option is fine. Manual No. 775051 BIOS Configuration Utility (RAID EzAssist) . Note In the event that the RAID controller needs to be replaced, the current drive geometry will be restored from the configuration on disk (COD). BIOS Configuration Utility (RAID EzAssist) RAID EzAssist is the on-board BIOS Configuration Utility used to build several types of RAID configurations. Refer to the RAID EzAssist Configuration Utility User Reference Guide or RAID EzAssist Configuration Utility Quick Configuration Guide for instructions on starting and using this utility. Operating System If an operating s...

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