DAC960PG™ and DAC960PJ™ PCI to Ultra SCSI RAID Controllers Installation Guide Part Number 775012-02 08P4078 © Copyright 2000 Mylex Corporation. All Rights Reserved. All contents of this manual are copyrighted by Mylex Corporation.
Greetings Thank you for purchasing the Mylex DAC960PG™ or DAC960PJ™ controller. This manual describes the installation of the Mylex DAC960PG/PJ controllers. Requests for technical information about this and other Mylex Corporation products should be made to your Mylex authorized reseller or Mylex sales representative. Please Notice IBM, Mylex, RAID EzAssist, Global Array Manager, GAM, DAC960PG, and DAC960PJ are trademarks or registered trademarks of International Business Machines Corp.
About This Manual This installation guide covers hardware set-up and configuration procedures necessary for the installation of Mylex DAC960PG and DAC960PJ PCI to Ultra SCSI RAID controllers. Chapter 1 describes the controllers, standard package contents, and usersupplied items necessary for installation. Chapter 2 describes steps to be performed prior to controller installation. Chapter 3 describes installation of the controller. Chapter 4 describes controller start-up and BIOS options.
Contents Chapter 1 Introduction ........................................................................................ 1-1 Product Description ........................................................................... 1-1 Controller Features and Functions ............................................. 1-2 Operating System Support ......................................................... 1-2 Standard Package Contents ............................................................. 1-3 Hardware ..............
Appendix A Battery Backup Unit Option ........................................................A-1 Product Description ...........................................................................A-1 Features .....................................................................................A-1 Installation .........................................................................................A-2 Operation ...........................................................................................
Appendix E Regulatory Information .................................................................E-1 Class B Compliance ..........................................................................E-1 Declaration of Conformity ..................................................................E-2 Declaration of Conformity ..................................................................E-3 Community of Europe ........................................................................
viii DAC960PG and DAC960PJ Installation
Chapter 1 Introduction This chapter covers: • Product description • Standard package contents • User supplied items Figure 1-1. DAC960PG or DAC960PJ Disk Array Controller Product Description The Mylex DAC960PG™ and DAC960PJ™ controllers are 32-bit PCI to Ultra SCSI RAID controllers designed for high performance file servers.
Product Description Controller Features and Functions Features of the DAC960PG and DAC960PJ controllers include: • Ultra SCSI drive channels that support RAID levels 0, 1, 3, 5, 0+1, 10, 30, and 50 • Single-Ended Wide Ultra SCSI (Fast 20) drive support • High performance RISC processor and EDO ECC DRAM cache (4MB to 128MB) for high speed, fault tolerant I/O transfers • 512KB, 8-bit flash EEPROM for BIOS and code supports future enhancements through firmware upgrades • Built-in configuration utilities in BI
Introduction Standard Package Contents The following items are supplied with the standard shipping package: Hardware • DAC960PG or DAC960PJ Disk Array Controller with documentation • Battery Backup (BBU) port loopback terminator plug, or... • Optional Battery Backup Unit (BBU) ☛ Note A loopback terminator plug must be installed on the DAC960PG or DAC960PJ controller’s BBU connector if the optional BBU is not present.
User-supplied Items User-supplied Items The following user-supplied items are required to perform this installation: • IBM-PC™ compatible host system with an available PCI slot (PCI 2.
Chapter 2 Preinstallation Planning This chapter covers: • SCSI termination • SCSI cabling • SCSI drive preparation • Limitations on mixing Narrow and Wide SCSI drives Mylex Disk Array Controllers are designed to work in a variety of SCSI RAID application environments. Certain configuration steps need to be performed prior to installing the controller into a RAID environment. Manual No.
SCSI Termination SCSI Termination The DAC960PG and DAC960PJ are equipped with automatic SCSI termination circuitry. If the controller is at the end of a SCSI bus, it automatically enables on-board termination. If all the SCSI devices on a channel are connected either to an internal connector of a channel, or to an external connector of a channel, the end of the SCSI bus farthest from the controller must have a terminator installed. In this case, the controller automatically enables on-board termination.
Preinstallation Planning Figure 2-1. DAC960 Controller Termination Examples ☛ Note For this discussion, assume that the illustrated internal and external connectors are both on the same channel. It is better to terminate the ends of the SCSI bus itself than it is to terminate the end devices on the bus. This allows hot swap devices to be added or removed from the SCSI bus without affecting termination. Manual No.
SCSI Cabling SCSI Cabling Each Ultra SCSI channel supports up to 15 drives. The total allowable SCSI bus lengths will be limited to the single-ended bus lengths shown in Table 2-1. Table 2-1. Supported SCSI Formats and Bus Lengths SCSI Drive Type* Bus Speed, Bus Width, Bus Length, Drives** per Max.(MB/Sec) (Bits) Max.(Meters) Channel, Max. SCSI-1 5 8 6 Fast SCSI Fast Wide SCSI 7 10 8 3 7 20 16 3 15 Ultra SCSI 20 8 1.
Preinstallation Planning SCSI Drive Preparation Prepare the drives for installation as follows: • Remove any terminators attached to the drive or set any drive termination jumpers to the disabled position. • Set the SCSI addresses on the drives. ☛ Note Each drive on a channel must have a unique ID chosen from 0 through 6 or 8 through 15. ID 7 cannot be used as a drive ID because it is reserved for the controller. • Enable term power on the drives.
Mixing Narrow and Wide SCSI Devices 2-6 DAC960PG and DAC960PJ Installation
Chapter 3 Installation This chapter covers: • Preparation • Connectors and Jumpers • Safety Considerations • Controller Installation Procedures Before You Begin Installing a Mylex DAC960 PCI to Ultra SCSI RAID controller is no more difficult than installing any PCI adapter. Follow these steps and then follow the installation procedures in this chapter. WARNING Disconnect the system from the electrical wall outlet before opening the system cabinet.
Connectors and Jumpers Connectors and Jumpers Up to three Ultra SCSI channels are supported on the DAC960PG and DAC960PJ. The SCSI connector locations are shown in Figure 3-1. Be sure that the Jumper JP6 has a jumper installed (see Figure 3-1 and Table 3-1). Figure 3-1. Full-length Controller Component Layout Table 3-1.
Installation External SCSI Connectors The external connectors on the controller are female, Very High Density Cable Interconnect (VHDCI) connectors. Figure 3-2 shows the configurations that are available on both the DAC960PG and the DAC960PJ. A DAC960PG 1-Channel B DAC960PG 2-, 3-Channel DAC960PJ 2-, 3-Channel Figure 3-2. Configurations of 1, 2, and 3 External SCSI Connectors Manual No.
Safety Considerations Safety Considerations Be sure to observe the following precautions before beginning the controller installation procedure: Caution Anti-static handling procedures are required. Leave the controller in its anti-static bag until it is time to plug the controller into the PCI slot. The use of a grounded wrist strap and other ESD protective measures are highly recommended. WARNING Disconnect the system from the electrical wall outlet before opening the system cabinet.
Installation Installing the Controller ☛ Note If a Battery Backup Unit (BBU) is to be installed, it should be done before the controller is installed into the host system. Refer to Appendix A for information on installing the BBU. Follow these steps: 1. Power-off all enclosures and the system components and disconnect their power cords. 2. Remove the covers or the cabinet as necessary to access the I/O slots on the system board. 3.
Installing the Controller 3-6 DAC960PG and DAC960PJ Installation
Chapter 4 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 DAC960PG and DAC960PJ 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 Sequence 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 CDROM 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.
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.
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.
Controller Start-up Global Array Manager (GAM) Client The controller can be configured using Global Array Manager Client. GAM Client can also be used from the server or a system client to monitor status and verify data integrity of disks connected to the controller while the system and disks are running. For details on how to install and run GAM Client, refer to the Global Array Manager Client Software Installation Guide and User Manual.
In Case of Problems 4-6 DAC960PG and DAC960PJ Installation
Appendix A Battery Backup Unit Option Product Description The Battery Backup Unit (BBU) option is an add-on module that protects the data in the RAID controller’s cache memory in the event of a power failure. The battery backup module monitors the write back cache on the DAC960PG and DAC960PJ and provides power to the cache if it contains data not yet written to the drives when power is lost. The controller, with the BBU installed, occupies only one PCI slot on the host backplane.
Installation Installation Tools Needed The only tool needed for the installation is a small, flat-blade screwdriver. Procedure 1. If the DAC960PG or DAC960PJ is not already removed from the system, power down the system and then remove the DAC960PG or DAC960PJ. WARNING Disconnect the system from the electrical wall outlet before opening the system cabinet. Working with the system covers off and power applied to the system can result in shock and serious injury. 2.
Battery Backup Unit Option Figure A-2. Removing the Loopback Plug 3. Remove the protective pin cover and peel-off label from J1 on the BBU. 4. Leaving the 4 standoffs attached to the BBU, remove a nylon screw from the free end of each nylon standoff. Manual No.
Installation Figure A-3. Installing the BBU 5. Install the BBU so that J1 on the BBU connects to J5 on the DAC960PG or DAC960PJ. Pin 1 on the BBU’s J1 must connect to hole 1 on the DAC960PG and DAC960PJ’s J5. The mounting holes on the BBU will line up with the mounting holes on the DAC960PG or DAC960PJ if the connectors are plugged in correctly. 6. Be sure the four standoffs line up with the four holes in the DAC960PG or DAC960PJ.
Battery Backup Unit Option Operation Battery Conditioning Prior to Use Battery conditioning is automatic. There are no manual procedures for battery conditioning or preconditioning to be performed by the user. Set-up – Enabling the Write-Back Cache The write-back cache is enabled by toggling the write-back/write-through mode switch. The write-back/write-through mode switch is accessed in the Onboard Configuration Utility, RAID EzAssist, or in GAM.
Maintenance Maintenance No end user maintenance is required on the BBU. It is recommended, however, that the battery charge level be periodically checked using the Gas Gauge function in GAM (see the Global Array Manager Client Software Installation Guide and User Manual). Removing the Battery Backup Module The battery backup module will need to be removed for one of the following reasons: 1. The NiCd battery will no longer accept a charge properly (NiCd battery life expectancy is approximately 5 years).
Battery Backup Unit Option Functional Description General Operational Description Whenever the system is running, the BBU is standing by, monitoring the voltage level of VCC. In the event of a power failure, the VCC voltage level will begin to drop. When the BBU detects this voltage drop, it checks the status of the disk cache. If the cache is empty, the BBU does nothing. If the cache contains data during a power failure, the BBU will maintain cache data integrity until the power is restored.
Functional Description Battery and Charge Circuit Onboard Battery The onboard battery is rated at 3.6 v with a capacity of 650 mAH. The BBU has a DC-DC converter that converts the 3.6 v from the battery to 5 v, which is the nominal voltage needed to replace VCC if a power failure should occur. Battery Charger Battery charging and conditioning are automatically handled by the BBU. No manual preconditioning needs to be performed by the user.
Battery Backup Unit Option BBU Specifications Onboard Battery Electrical Properties 3 NiCd 1.2 V, 650 mAH cells, connected in series for a total of 3.6V at 650mAH Physical Description Nominal pack size (in inches): 1.89(L) X 2.01(W) X 0.33 (H) Battery Charge Life Depends upon memory in use External Battery Not supported Module Dimensions Length: 3.75 inches Width: 2.
BBU Specifications A-10 DAC960PG and DAC960PJ Installation Guide
Appendix B DAC960PG and DAC960PJ Specifications General Hardware Specifications DAC960PG Controller DAC960PG CPU Intel i960 RP® RISC 32-bit microprocessor, 33MHz Memory EDO ECC RAM, 60ns, 72-pin SIMM, n x 40 (Use only Mylex supplied SIMMS) Minimum: 4 MB Optional: 8, 16, 32, 64, or 128 MB Cache Write: Selectable – Write/Through or Write/Back Error Protection: Error Correction Code (ECC) Firmware ROM Type, Flash EEPROM, 512K x 8 PCI I/O Processor: Embedded Intel i960 RP 32-bit bus Transfer Rate: U
General Hardware Specifications DAC960PJ Controller DAC960PJ CPU Intel i960 RD® RISC 32-bit microprocessor, 66MHz Memory EDO ECC RAM, 60ns, 72-pin SIMM, n x 40 (Use only Mylex supplied SIMMS) Minimum: 4 MB Optional: 8, 16, 32, 64, or 128 MB Cache Write: Selectable – Write/Through or Write/Back Error Protection: Error Correction Code (ECC) Firmware ROM Type, Flash EEPROM, 512K x 8 PCI I/O Processor: Embedded Intel i960 RD 32-bit bus Transfer Rate: Up to 133MB/second SCSI Mylex BA-81C15, one per
DAC960PG and DAC960PJ Specifications Physical and Environmental Specifications Controller DAC960PG/PJ Form Factor: Full-length card Length Width 12.283 inches 4.2 inches Component 0.105 inches – solder side Height (max.) 0.
Physical and Environmental Specifications B-4 DAC960PG and DAC960PJ Installation
Appendix C Error Messages Start-up Error Messages The BIOS looks for any initialization message posted by the firmware during the start-up sequence. If a message is found, one of the following errors displays on-screen and the installation process aborts.
Installation Abort During the initialization, if the firmware fails to respond to the BIOS inquiry within two minutes, the following message displays: DAC960Pn not responding--no drives installed. The BIOS then inquires the firmware for its version number and other information, and prints out the following message: DAC960Pn firmware version x.
Error Messages NVRAM Error With Firmware 4.x, if the BIOS displays a mismatch between the NVRAM and the COD, no drives will be installed. Normally this error will not be displayed. If it is, boot and run the on-board Mylex Disk Array Configuration Utility (see Chapter 4) to recover from the error. For more information, refer to the RAID EzAssist Configuration Utility User Reference Guide, available on CD-ROM, or RAID EzAssist Configuration Utility Quick Configuration Guide.
System Reboot or Power Down Messages C-4 DAC960PG and DAC960PJ Installation
Appendix D Enclosure Management Introduction Mylex’s DAC960PG/PJ Disk Array Controllers support the industry standard enclosure management protocol SCSI Accessed Fault-Tolerant Enclosures (SAF-TE). This feature allows the host to monitor drive enclosures and detect certain faults or operating environment conditions. The host can make a decision to shut down the system or issue a warning based on the type of fault detected.
SAF-TE D-2 DAC960PG and DAC960PJ Installation
Appendix E Regulatory Information Class B Compliance THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: 3. THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND 4. THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules.
Declaration of Conformity Declaration of Conformity Manufacturer’s Name: Mylex Corporation Manufacturer’s Address: 34551 Ardenwood Blvd.
Regulatory Information Declaration of Conformity Per 89\336\EEC Responsible Party Name: Mylex Corporation Address: 34551 Ardenwood Boulevard Fremont, CA 94555-3607 USA hereby declares that the product Trade Name: Model Number: High Performance Caching RAID Controller DAC960PG/PJ conforms to the following specifications Standards: EN 50081-1:1992, EMI EN 55022 Class B (Radiated), Class B (Conducted) EN 50082-1:1992, Immunity EN 61000-4-2:1995 Electrostatic Discharge EN 61000-4-3:1996 Radiated Susceptibi
Community of Europe Community of Europe CE mark is rated for the DAC960PG™ and DAC960PJ™ as follows: CISPR 22 Radiated Emission EN55022, EN5082-1 Generic immunity standard for the following: IEC 801-2 ESD, IEC 801-3 Radiated, and IEC 801-4 EFT/Burst Warning! This is a Class B product. In a residential environment this product may cause radio interference, in which case the user may be required to take adequate measures. Achtung! Dieses ist ein Gerät der Funkstörgrenzwertklasse B.
Regulatory Information Underwriters Laboratories Listing and Warning WARNING This controller is furnished with a nonvolatile RAM (NVRAM) chip that uses a sealed lithium battery/crystal module. Replace the module only with the same or equivalent type recommended by the manufacturer. Dispose of the used battery/ crystal module according to the manufacturer's instructions. Never incinerate a battery as it could explode and cause serious injury. Manual No.
Underwriters Laboratories Listing and Warning E-6 DAC960PG and DAC960PJ Installation
Glossary AcceleRAID™ The AcceleRAID family features high performance, cost effective Ultra SCSI/Ultra2 SCSI LVD and Ultra 160 SCSI to PCI RAID controllers and adapters for high-end desktops, workstations, and entry level and mid range servers. AcceleRAID controllers support PCI-based motherboards with embedded SCSI chips and systems that have a PCI expansion slot designated for add-in RAID controllers. The AcceleRAID family consists of the 150, 200, 250, 352, 160, 170, and 170LP controllers.
Automatic Rebuild Mylex controllers provide automatic rebuild capabilities in the event of a physical disk drive failure. The controller performs a rebuild operation automatically when a disk drive fails and both of the following conditions are true: A standby or hot spare disk drive of identical or larger size is found attached to the same controller; All system drives that are dependent on the failed disk drive are configured as a redundant array: RAID 1, RAID 3, RAID 5, or RAID 0+1.
Glossary Bus A set of conductors that connect the functional units in a computer and are the channels through which data is transferred. There are several types of bus channels, including serial, parallel, PCI, ISA, EISA, and MCA. See also I/O Bus. Cables The physical wires (copper or fibre optic) over which electrical signals are transmitted. Cables are used to connect peripherals (such as disk arrays) to computers and servers or to connect peripherals or components to each other.
SCSI bus on a disk array controller. Each disk array controller provides at least one channel. Conservative Cache An operating mode in which system drives configured with the write-back caching policy are treated as though they were configured for write-through operation and the cache is flushed. Consistency Check A process that verifies the integrity of redundant data.
Glossary Disk Array A collection of disks from one or more commonly accessible disk systems. Disk arrays, also known as RAID, allow disk drives to be used together to improve fault tolerance, performance, or both. Disk arrays are commonly used on servers and are becoming more popular on desktops and workstations. See also Array. Disk Drive A device for the electronic digital storage of information. Disk System A storage system capable of supporting only disks.
ECC Error Correcting Code, a method of generating redundant information which can be used to detect and correct errors in stored or transmitted data. EDO Extended Data Output, a type of random access memory (RAM) chip designed to improve the time to read from memory on faster microprocessors such as the Intel® Pentium. EEPROM Electrically Erasable PROM, see EPROM.
Glossary Failback Restoring a failed system component’s share of a load to a replacement component. Failover A mode of operation for failure tolerant systems in which a component has failed and a redundant component has assumed its functions. Failover Port A fibre channel port capable of assuming I/O requests for another, failed port on the loop. During normal operation, a failover port may be active or inactive. Failover ports assume the same loop ID and, optionally, the same node from the failed port.
Gigabyte 230 (1,073,741,824) bytes. Abbreviated as G or GB. Global Array Manager (GAM) A Mylex RAID management utility that allows a system administrator to configure, monitor, and manage network RAID storage from anywhere in the world. GAM can communicate critical notification via e-mail, fax, pager, SNMP or the launching of an application. GAM is everything needed to manage Mylex PCI RAID Controllers, SCSI Host Adapters, and External RAID Controllers.
Glossary controller to “rebuild” the data on the new drive, all without interrupting system operations. Once the rebuild is complete, the controller will be brought back into a fault tolerant state. See also Hot Swap. Hot Spare A physical disk drive not part of a system drive that the controller can use to automatically rebuild a critical system drive. The hot spare drive must have at least as much capacity as the largest disk drive in the array or the rebuild may not start. See also Hot Standby.
I/O Input/Output, the transmission of information between an external source and the computer. I/O Bus Any path used for the transfer of data and control information between I/O adapters and storage controllers or storage devices. See also Bus. I2O Intelligent Input/Output, a driver that uses special I/O processes to eliminate I/O bottlenecks. The processes deal with interrupt handling, buffering, and data transfer.
Glossary Logical Drive States A logical (system) drive can be Online, Critical, or Offline. Notice that the term “online” is used for both physical and logical drives. LVD Low Voltage Differential, a form of SCSI signaling introduced with Ultra2 SCSI (Fast40 SCSI) uses data high and data low signal lines to increase transmission distances over those of single-ended (conventional SCSI signaling) lines. LVD allows for cable lengths of up to 12 meters (approximately 39 feet) with up to 15 devices.
Mirroring Refers to the complete duplication of data on one disk drive to another disk drive, this duplication occurs simultaneously with each write operation: each disk will be the mirror image of the other (also known as RAID Level 1, see RAID levels). All Mylex RAID controllers support mirroring. M.O.R.E. Mylex Online RAID Expansion, an advanced configuration mode that allows expansion of any unconfigured or hot spare drive into the expandable drive group while the controller is online with the host.
Glossary Offline A Logical Drive is in an “offline” state if no data can be read from it or written to it. Offline does not apply to physical disk drives. System commands issued to offline logical drives are returned with an error status; no operations can be performed on offline logical drives. See also Logical Drive States, Online, and Critical. Online A Logical Drive is in an “online” state if all of its participating SCSI drives have power and are operational.
Physical Device Any device connected to some kind of hardware. For example, SCSI disk, fibre disk, network disk, RAM disk, etc. Physical Disk Drive A single hard disk drive. Each physical disk drive is assigned a unique identification address. PROM Programmable Read-Only Memory, memory that users with appropriate instructions can reprogram. Protocol A special set of rules for transmitting data between two devices in a telecommunication connection.
Glossary RAID Levels Mylex disk array controllers support four RAID Advisory Board approved (RAID 0, RAID 1, RAID 3, and RAID 5), two special (RAID 0+1, and JBOD), and three spanned (RAID 10, 30, and 50) RAID levels. All DAC960, AcceleRAID, and eXtremeRAID series controllers support these RAID levels. Level 0: Provides block “striping” across multiple drives, yielding higher performance than is possible with individual drives. This level does not provide any redundancy.
RAID Migration A feature in RAID subsystems that allows for changing a RAID level to another level without powering down the system. RAM Random Access Memory, the "built-in" readable and writable data storage that comes with (or can be added to) a computer. RISC Reduced Instruction Set Computing, architecture for an application-specific processor. RJ-11, RJ-45 Registered Jacks (sometimes described as RJ-XX), a series of telephone connection interfaces (receptacle and plug) that are registered with the U.
Glossary enclosure itself is treated as simply another device on the SCSI bus. Many other leading server, storage, and RAID controller manufacturers worldwide have endorsed the SAF-TE specification. Products compliant with the SAF-TE specification will reduce the cost of managing storage enclosures, making it easier for a LAN administrator to obtain base-level fault-tolerant alert notification and status information. All Mylex RAID controllers feature SAF-TE.
Offline: A SCSI disk drive is in a “offline” state if it is not present, if it is present but not powered on, or if it failed to operate properly and was “offline” by the controller. When the controller detects a failure on a disk, it “kills” that disk by changing its state to “offline.” An “offline” SCSI drive can also be present and powered on, but a SCSI drive in a “offline” state does not participate in any I/O activity; no commands are issued to dead drives.
Glossary reported, conservative cache is enabled and all system drives are switched to write-through cache. Primarily used in fibre enclosures. SIMM Single In-line Memory Module, RAM packed on a small circuit board with a defined edge connector. Two SIMMs are required for a 64-bit memory path on a Pentium processor. See also DIMM. SISL See SCSI Interrupt Steering Logic (SISL).
To use the standby rebuild feature, you should always maintain a standby SCSI disk in your system. When a disk fails, the standby disk will automatically replace the failed drive and the data will be rebuilt. The system administrator can disconnect and remove the bad disk and replace it with a new disk. The administrator can then make this new disk a standby. The standby replacement table has a limit of 8 automatic replacements in any session (from power-on/reset to the next power-off/reset).
Glossary drive 1, block 2 on SCSI drive 2, block 3 on SCSI drive 3, block 4 on SCSI drive 1, block 5 on SCSI drive 2, and so on. This storage method increases the disk system throughput by ensuring a balanced load among all drives. Sustained Data Transfer Rate A rate of data transfer defined for continuous operation at a maximum speed level.
Ultra SCSI (Fast 20 SCSI) A high performance SCSI protocol that has a bus speed of 20 Megabytes per second in the Narrow SCSI configuration and 40 MB in the Wide SCSI (Fast 20 Wide SCSI) configuration. Ultra Wide SCSI 16-bit wide Ultra SCSI (IS devices), double the speed of narrow SCSI. Ultra2 SCSI (Fast 40 SCSI) A higher performance SCSI protocol than Ultra SCSI.
DAC960 Problem Report Customer Identification Name: ___________________________________ Company: ________________________________ Address: _________________________________ ________________________________________ ________________________________________ Country: _________________________________ Phone Number:____________________________ Fax Number:______________________________ DAC960 Identification Date: Purchase Date: Model Invoice Number: Serial Number: # Chnls: Cache: Firmware Ver: BIOS Ver: Make/Mode
Mylex Warranty - Customer Policy Thank you for purchasing this Mylex product for your computer system. In addition to this high-quality product, your purchase entitles you to the warranty coverage set forth herein. In order to provide this warranty coverage, and to indicate your acceptance of this warranty, we must have the attached Warranty Registration Card completed and returned to us within 15 days of your purchase.
Returned Merchandise Procedures If you suspect that there is a defect in the material or workmanship of this PRODUCT, you should contact the person or company from which you purchased it. That person or company may be able to solve the problem and if not, will be able to contact us for technical assistance or repair. If it is determined that the PRODUCT must be returned to MYLEX for repair or replacement, contact MYLEX’s Technical Support Department at 510-608-2400 before it is returned.
