HP A5150A manual Scsi Bus Termination, Auto Termination Information

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NOTE

Installing the A5150A Adapter

SCSI Bus Termination

SCSI Bus Termination

The devices that make up the SCSI bus are connected serially (chained together) with SCSI cables. The first and last physical SCSI devices connected on the ends of the SCSI bus must have a set of resistors called terminators. All other SCSI devices on the bus must have their terminators removed or disabled.

The A5150A host bus adapter is also on the SCSI bus. Termination of the host bus adapter is automatically enabled when it is connected to the end of the bus.

Low-voltage differential peripheral devices are usually terminated with external terminators; however, they are sometimes terminated with jumpers or with a switch on the peripheral. Refer to the peripheral device manual to identify the termination setting of each device and how to change it.

Auto Termination Information

Two versions of the A5150A SCSI PCI Host Bus Adapter (HBA) will be in the field beginning approximately January 2001, with the release of a new version of the HBA. The older HBA has part number A5150-60001 and the new HBA has part number A5150-60101. The new HBA (also known as the jumperless A5150A) does not contain pins and jumpers used for manually configuring auto termination. On the jumperless A5150A, the default power-on setting has auto termination enabled. If you have the older adapter (A5150-60001), do not change the position of the jumpers; leave them as they were when you received the HBA from Hewlett-Packard (open - not jumpered). Auto termination in both A5150A HBAs—the A5150-60001 and the A5150-60101—is now controlled through commands at the Boot Console Handler (BCH) prompt. To use the auto termination feature of both A5150A HBAs, you must have the correct version of the Processor Dependent Code (PDC) on your system. The correct PDC versions are shown in Table 2-3.

Chapter 2

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Contents Manufacturing Part Number A5150-96002 E0201 EditionLegal Notices Page Page Contents Glossary HP A5150A Adapter Overview HP A5150A Adapter Overview A5150A PCI Ultra2 Scsi Host Bus Adapter About the A5150A AdapterFeatures Scsi Interface Interface DescriptionsPCI Interface Wide Ultra2 Scsi Interface A5150A Supported HP 9000 and HP e3000 Servers Supported HP 9000 and HP e3000 ServersAdapter Description Product Option Number Cables for Connecting External Scsi Devices to the A5150ACable Specifications Installing the A5150A Adapter Installing the A5150A Adapter Preparing for Installation Handling the A5150A Adapter Before You Start Looking at Adapter InstallationImportant Terms and Concepts Install Using Olar HP-UXOlar Important Terms MeaningCard Compatibility Planning and PreparationLooking at Adapter Installation OLA/R Restrictions for the A5150A A5150-60001 Default Scsi Attribute ValuesAttribute Default Value Install/Replace With System Powered Down Step Scsi Cable Connecting the Scsi PeripheralsMaking External Scsi Bus Connections Making Internal Scsi Bus Connections Auto Termination Information Scsi Bus TerminationHP 9000 System PDC Version Bus TerminationAuto Termination PDC Versions When To Turn Off Auto Termination When and How to Turn Off Auto TerminationScsi Bus Termination How to Turn Off Auto Termination PCI Device Information Scsi term 0/2/0/0 on Setting Scsi IDsScsi Device Channel a Scsi Device Channel B Record of Scsi IDsVerifying Installation Verifying Installation HP e3000 Troubleshooting Troubleshooting General Procedure Clearpim Checking Scsi Bus CompatibilityDisplaying Transfer Rates Scsi CommandSetting Transfer Rates Displaying Scsi IDs Setting Scsi IDs Using Support Tools Manager STM Contacting Your Hewlett-Packard Representative Contacting Your Hewlett-Packard Representative Contacting Your Hewlett-Packard Representative Chapter Scsi Sense Codes Scsi Sense Codes Status Code Table A-1 Scsi Status CodesSense Key Table A-2 Scsi Sense KeysAddition Qualifier Al Sense Code Table A-3 Scsi Additional Sense Code/Qualifier Code PairsLogical unit not ready, cause not Meaning Addition Qualifier Al Sense Code Recorded entity not found Recovered data with error correction Applied Logical block address out of range Commands cleared by another initiator Sequential positioning error Target operation conditions have Changed Write append error Log exception 0x69 0x00 Regulatory Information FCC Statement For U.S.A. Only Regulatory StatementsIEC Statement Worldwide DOC Statement CanadaVcci Statement Japan Spécification ATI Classe a FranceDeclaration of Conformity CPU central processing unit GlossaryAsynchronous Data Transfer Nvram For each Scsi host adapter ROM Read-Only Memory RAM Random Access

A5150A specifications

The HP A5150A is a notable addition to HP's extensive line of desktop computers, designed to cater to both home and office users looking for a balance of performance and value. This model is characterized by its robust build and a range of features that enhance versatility and usability.

One of the standout features of the HP A5150A is its processor options. It typically comes equipped with a dual-core AMD Athlon processor, which provides ample power for everyday tasks such as web browsing, document editing, and multimedia playback. For users needing a little more performance, the system supports upgrades, allowing for future enhancements as demands change.

In terms of memory, the A5150A generally includes 1GB of DDR2 RAM, with options to expand depending on user needs. This flexibility ensures that users can manage multiple applications simultaneously without experiencing significant slowdowns, making it suitable for light multitasking.

Storage is another critical characteristic of the A5150A. The desktop commonly features a 160GB hard drive, offering enough space for essential files, programs, and media. However, users can benefit from additional storage options, as the unit typically supports multiple hard drive configurations, allowing for increased capacity or redundancy with RAID setups.

Graphics capabilities are addressed by an integrated ATI Radeon graphics processor, enabling decent performance for casual gaming and media playback. While it may not meet the demands of high-end gaming, the graphics hardware is sufficient for most users' everyday needs.

Connectivity features on the HP A5150A are comprehensive. It often includes multiple USB 2.0 ports for peripherals, audio jacks for headphones and microphones, and Ethernet connectivity for network access. Furthermore, connectivity options like VGA outputs provide compatibility with a variety of displays, enhancing the desktop's functionality.

The HP A5150A also places an emphasis on ease of use and manageability. With HP's user-friendly design, tasks such as upgrading components or performing maintenance can generally be completed without extensive technical knowledge. This focus on user accessibility is a significant advantage, especially for small business environments.

In summary, the HP A5150A stands out for its reliable performance, versatility, and user-friendly design. With features catering to both casual users and business applications, this desktop remains a solid choice for those in search of value without compromising essential functionalities. Its upgrade potential ensures that it can evolve alongside user needs, making it a lasting investment in the realm of personal computing.