AcceleRAID™ 352 PCI to Ultra 160 SCSI RAID Controller Installation Guide Part Number 775051-01 08P4089 © Copyright 2000 Mylex Corporation. All Rights Reserved. All contents of this manual are copyrighted by Mylex Corporation.
Greetings Thank you for purchasing the Mylex AcceleRAID™ 352 disk array controller. Requests for technical information about this and other Mylex Corporation products should be made to your Mylex authorized reseller or Mylex marketing representative. Please Notice IBM, Mylex, AcceleRAID, RAID EzAssist, Global Array Manager, and GAM are trademarks or registered trademarks of International Business Machines Corp. and its subsidiaries.
About This Manual This installation guide covers hardware set-up and configuration procedures necessary for the installation of a Mylex AcceleRAID 352 dual channel RAID controller. Chapter 1 describes the controller, standard package contents, and usersupplied items necessary for installation. Chapter 2 describes the steps to be performed prior to controller installation and the physical installation of the AcceleRAID 352 dual channel RAID controller.
Conventions Throughout the manual, the following conventions are used to describe user interaction with the product: prompt This style of type indicates screen display messages Enter Press the key labeled “Enter” (or “Delete,” etc.) ☛ Note Supplementary information that can have an effect on system performance. Caution Notification that a proscribed action has the potential to adversely affect equipment operation, system performance, or data integrity.
Contents Chapter 1 Introduction Product Description ........................................................................... 1-1 Controller Features .................................................................... 1-2 Channel Capabilities .................................................................. 1-2 Controller Capabilities ................................................................ 1-2 Operating System Support .........................................................
Chapter 3 Controller Start-up BIOS Options ..................................................................................... 3-1 Setting BIOS Options ................................................................. 3-2 BIOS Configuration Utility (RAID EzAssist) ....................................... 3-4 Operating System .............................................................................. 3-4 Operating System Device Drivers ......................................................
Appendix D PCI Hot Plug Introduction ........................................................................................D-1 Implementation ..................................................................................D-1 NetWare .....................................................................................D-1 Windows NT ...............................................................................D-3 Windows 2000 ............................................................................
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Chapter 1 Introduction This chapter describes: • The AcceleRAID™ 352 controller • Standard package contents • User supplied items Figure 1-1. AcceleRAID 352 Controller Product Description The Mylex AcceleRAID 352 controller is an Ultra 160 SCSI to a PCI dual channel RAID controller with 64-bit, 33MHz PCI capability. The AcceleRAID 352 supports two external Ultra 160 SCSI connectors, two internal Ultra 160 SCSI connectors, and an optional battery backup module (BBM).
Product Description Controller Features Features of the AcceleRAID 352 controller include: • One Q-Logic ISP 12160A chip to support two Ultra 160 SCSI LVD channels • Intel i960RN at 100MHz RISC processor • BBM (Battery Backup Module), optional • 32MB, 64MB, or 128MB ECC cache DIMM module • PCI 2.1 and 2.2 compliant (PCI 2.2 required to use hotplug feature) • 1MB, 8-bit flash EEPROM for BIOS and code • Built-in configuration utilities (in BIOS) • Write-through and write-back cache support.
Introduction Operating System Support MS-DOS 5.x, 6.x, and above are supported using drivers that reside in the AcceleRAID BIOS. Many other popular operating systems are supported using software drivers in the Disk Array Controller Software Kit that is included with the AcceleRAID 352 controller (see the PCI Disk Array Controller Drivers Installation Guide and User Manual). Manual No.
Standard Package Contents Standard Package Contents The following items are supplied with the standard shipping package: Hardware • AcceleRAID 352 Disk Array Controller with documentation included on the CD-ROM and a printed Quick Installation Guide.
Introduction User-supplied Items The following user-supplied items are required to perform this installation: • IBM-PC™ compatible host system with PCI slot (PCI 2.1 and 2.2 compliant; you must be PCI 2.2 compliant to use PCI Hot Plug) • Network operating system software (as required) • SCSI cables to connect the controller and disk arrays • Static grounding strap or electrostatic discharge (ESD) safe work area • Disk array enclosure (or equivalent) with SCSI disk drives Manual No.
User-supplied Items 1-6 AcceleRAID 352 Installation Guide
Chapter 2 Installation This chapter describes: • Before you begin • Safety considerations • Installation checklist • Connectors, Jumpers, LED’s • Controller installation • SCSI cabling and termination • SCSI IDs • Limitations on mixing SCSI drive types 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.
Before You Begin Before You Begin Installing the AcceleRAID 352 Dual Channel RAID controller is no more difficult than installing any 32-bit or 64-bit PCI adapter. The AcceleRAID 352 dual channel controller connects into any PCI slot (PCI 2.1 or 2.2 compliant) on the motherboard. Follow these steps and the installation procedures in this chapter. WARNING Working with the system covers off and power applied to the system can result in shock and serious injury.
Installation 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 Checklist Installation Checklist GET READY ☛ Note It is recommended that you wear a grounded wrist strap when working with hardware installation procedures. 1. ____ Power off your computer system. 2. ____ Decide which available PCI slot will be used. 3. ____ Remove the plate from the I/O access port to the PCI slot. 4. ____ Remove the AcceleRAID 352 controller from the anti-static bag. GET SET 5. ____ Plug the AcceleRAID 352 controller into a standard PCI slot (PCI 2.1 or 2.
Installation Connectors, Jumpers and LEDs There are two external Ultra 160 SCSI channels (connectors) supported on the controller as shown in Figure 2-1. SCSI jumpers should normally be set to their default settings, no adjustments are needed. Default jumper locations are shown in Figure 2-2 and are described in Table 2-1. The AcceleRAID 352 controller has one LED on the front side as shown in Figure 2-3 and described in Table 2-2.
Connectors, Jumpers and LEDs CH0 CH1 CH0 CH1 Figure 2-1. AcceleRAID 352 Controller with Connectors JP1 JP2 JP3 Figure 2-2. AcceleRAID 352 Default Jumper Identification Table 2-1.
Installation FAIL LED U1 Figure 2-3. AcceleRAID 352 Controller with LED (front) Table 2-2. LED Description (front) U1 FAIL LED Manual No.
Connectors, Jumpers and LEDs SE 1 SE 0 LVD 0 LVD 1 PIN Nos. 654321 Figure 2-4. AcceleRAID 352 Controller with LEDs and Pin Numbers (back) Table 2-3. LED Descriptions (back) SE 1 Single-ended LED, Channel 1 SE 0 Single-ended LED, Channel 0 LVD 0 LVD LED, Channel 0 LVD 1 LVD LED, Channel 1 Table 2-4. Six-Pin Header Identification (JP3) Pin 1 3.
Installation Installation Process Installing the Controller Follow these installation steps: 1. Choose any available 32-bit or 64-bit PCI slot as shown in Figure 2-5. Figure 2-5. Choose an Available PCI Slot 2. Remove the metal cover plate from the slot’s access port (usually at the back of the cabinet) by releasing the black clip as illustrated below shown in Figure 2-6. Figure 2-6. Remove the Metal Plate Manual No.
Installation Process 3. Remove the AcceleRAID 352 controller from the anti-static bag as shown in Figure 2-7. Always handle the controller by the edges and wear a ground wrist strap. Ground Wrist Strap Figure 2-7. Remove the controller from the Anti-static Bag 4. Plug (install) the controller firmly into any 32-bit or 64-bit PCI slot as shown in Figure 2-8. Figure 2-8.
Installation Preparing the SCSI Drives To prepare the drives for installation, follow these steps: • Remove any terminators attached to the drive or set any drive termination jumpers to the disabled position. • Set the SCSI IDs on the drives. • Enable term power on the drives. Refer to the drive manual for specific information about drive configuration settings. Installing Cables and Setting Termination Please refer to Table 2-5 for SCSI Formats and Bus Length requirements. 5.
Installation Process ☛ Note In order to ensure an error free environment, the proper cable type designed for a certain SCSI speed must be used, please refer to Table 2-5 on page 2-17. ☛ Note It is recommended that non-RAID SCSI devices be connected to a separate SCSI channel, either on the system board or furnished by a SCSI host bus adapter. ☛ Note To avoid problems caused by mixing drive types, please refer to “Limitations on Mixing SCSI Drives” on page 2-18.
Installation SCSI Termination Each end of a SCSI bus must be terminated to maintain proper voltage levels for SCSI control and data signals. The device used for this purpose is called a terminator. Termination devices can be built into a controller, a SCSI device, or attached to the end of a SCSI bus. The AcceleRAID 352 controller is equipped with automatic SCSI bus termination circuitry. If the controller is at the end of a SCSI bus, it automatically enables on-board termination.
Installation Process 6. Termination - Only Internal or Only External Devices Check that the drive channel is properly terminated according to drawings below. The AcceleRAID 352 controller is equipped with automatic SCSI termination circuitry which handles automatic enabling and disabling of on-board termination. For example, if the controller is at the end of the SCSI bus, it automatically enables on-board termination.
Installation 7. Termination - Both Internal and External Devices Check that the drive channel is properly terminated according to the drawing below. If the controller is in the middle of the SCSI bus, it automatically disables on-board termination. If some SCSI devices on the channel are connected to the internal connector, and some are connected to the external connector, on the same channel, the two ends of the SCSI bus farthest from the controller must each be terminated.
Installation Process Setting SCSI Device IDs 9. Set the SCSI ID on the disk drives: ID 7 is reserved for the controller. ☛ Note Each drive must have a unique ID chosen from 0 through 6 or 8 through 15. Be careful not to duplicate a drive address on the same channel. Remember: ID 7 is reserved for the controller; therefore, it cannot be used as a disk drive ID. ID’s from 0 through 6 are usually for Narrow, 8-bit devices.
Installation SCSI Cabling The controller supports two Ultra 160 SCSI channels which can support up to 30 SCSI devices, (15 per channel). LVD Mode The controller supports Ultra 160 SCSI with LVD. If all drives attached to a controller drive channel support Ultra 160 SCSI with LVD, then that channel will operate at a maximum of 160MB/s burst speed. This setup allows a maximum SCSI bus length of up to 12 meters.
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.
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 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.
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 GAM. GAM 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, refer to the Global Array Manager Client Software Installation Guide and User Manual.
In Case of Problems 3-6 AcceleRAID 352 Installation Guide
Appendix A BBM-Battery Backup Module Figure A-1. BBM Module Product Description The Battery Backup Module (BBM) is a battery unit that maintains data integrity in the event of a power failure. The battery backup on this module monitors the write back cache on the AcceleRAID 352 controller, and provides power to the cache if it contains data not yet written to the drives when power is lost. The controller, with the BBM installed, occupies only one PCI slot on the host backplane.
BBM Operation BBM Operation This BBM consists of a Lithium-Ion battery, a charging circuit, and power monitoring circuitry. The controller is shipped with an optional BBM installed or with standard DIMM memory (without a BBM). Set-up – Enabling the Write-Back Cache Maximum RAID performance is achieved when the cache is in write-back mode. The write-back cache is enabled by toggling the write-back/writethrough mode switch.
BBM-Battery Backup Module Maintenance No maintenance is required. It is recommended that the BBM 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 BBM The BBM only needs to be removed if the Lithium-Ion battery no longer accepts a charge properly (Lithium-Ion battery life expectancy is approximately 1-1/2 years), or if the BBM is being salvaged from a controller that has failed.
BBM Functional Description Status Indication Battery status can be checked, and the battery can be reconditioned, or charged using the Intelligent Battery Backup Unit dialog box in Global Array manager Client. This is accessed by selecting the Intelligent BBU option on the Administration menu. Please refer to the Global Array Manager Client Software Installation Guide and User Manual. Battery and Charge Circuit On-board Battery The on-board battery is rated at 4.1 V with a capacity of 900 mAH.
BBM-Battery Backup Module BBM Specifications On-board Battery Electrical Properties • One Lithium-Ion cell, 4.1 V @ 900mAH Physical Description • Nominal pack size (in inches): 1.55(L) x 1.55(W) x 0.
BBM Specifications A-6 AcceleRAID 352 Installation Guide
Appendix B AcceleRAID 352 Specifications General Hardware Specifications AcceleRAID 352 Controller AcceleRAID 352 CPU i960RN microprocessor, 100MHz Cache Memory 32MB, 64MB, or 128MB installed on a DIMM module. Write: Selectable, Write-Through or Write-Back Error Protection: ECC (Error Correction Code) Firmware ROM Type, Flash EEPROM, 1MB x 8 PCI 32 bit, 64 bit, 33MHz - Host 32 bit, 64 bit, 33MHz - Internal PCI SCSI Supports a two channel Ultra 160 SCSI LVD ISP12160A Manual No.
General Hardware Specifications Environmental Specifications Controller AcceleRAID 352 Temperature Operating 0°C to +50°C (+32°F to +122°F) Storage -20°C to +70°C (-4°F to +158°F) Operating 10% to 90% relative humidity (non-condensing) Storage 10% to 90% relative humidity (non-condensing) Operating Up to 3,048m (10,000 ft ) Storage Up to 15,240m (50,000 ft) Length: 12.280 inches Width: 4.750 inches Humidity Altitude Form Factor Maximum. Component 0.
Appendix C AcceleRAID 352 Error Messages ☛ Note The firmware you are using may have these messages turned off. However, they are listed here for your reference. 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 If the firmware detects that during the last power cycle the system was turned off abruptly leaving some incomplete write operations, the following message appears: Recovery from mirror race in progress WARNING: Dead SCSI devices (Channel Target) : x:y The following messages may also appear: AcceleRAID 352 cannot recover from Mirror Race! Some system drives are inconsistent! During the initialization, if the firmware fails to respond to the BIOS inquiry within two minutes, the followin
AcceleRAID 352 Error Messages persists, it most likely indicates a genuine failure and needs to be corrected. To correct it, boot and run the on-board BIOS Configuration Utility, RAID EzAssist (see Chapter 3). For more information, refer to the RAID EzAssist Configuration Utility User Reference Guide or RAID EzAssist Configuration Utility Quick Configuration Guide. With Firmware 6.
System Reboot or Power Down C-4 AcceleRAID 352 Installation Guide
Appendix D PCI Hot Plug Introduction PCI Hot Plug is a feature that allows a PCI card to be replaced while the host system is still running. The term “Hot Plug” is somewhat misleading; the PCI card cannot simply be pulled out of the host system while the card is operating without risk to the card, the system, and the data on the system. In order to replace a Hot Plug PCI card, a software command must be invoked to power off the card slot before the card can be removed.
Implementation • odineb.nlm - This is a module combining the Open Data-link interface and the Novell Event Bus (NEB). The NEB controls the device drivers through the Open Data-link. If the NetWare installation process determines that the server supports PCI Hot Plug and detects the appropriate driver, the installation process adds the following two LOAD commands to the autoexec.ncf file: • LOAD sys:\system\driver_name This command loads the bus driver (for Compaq, this is cpqsbd.nlm).
PCI Hot Plug Windows NT Windows NT requires additional software from the vendor who makes the system. Since this software is not a part of NT, the software needs to be installed after the operating system is loaded. Refer to your system or server vendor's PCI Hot Plug documentation. Caution GAM drivers can stop PCI Hot Plug Boards from unloading. If this problem occurs, stop GAM and unload the GAM drivers before attempting to unload the PCI Hot Plug controller.
Implementation Windows 64 The released version of Windows 64 is intended to support the PCI Hot Plug capability. No additional software is required. Please refer to the Windows 64 documentation for instructions on how to use the PCI Hot Plug feature.
Appendix E Enclosure Management Introduction Mylex’s AcceleRAID 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.
SES SES The AcceleRAID 352 supports SES (SCSI Enclosure System) cabinets. Please refer to the documentation supplied with your SES enclosure cabinet for details on how to take advantage of this feature.
Appendix F Regulatory Information Class B Compliance THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: 4. THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND 5. THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. All external connections should be made using shielded cables.
Declaration of Conformity Declaration of Conformity Per FCC Part 2, Section 2.1077(a) Manufacturer’s Name: Mylex Corporation Manufacturer’s Address: 34551 Ardenwood Blvd. Fremont, CA 94555-3607 USA Declares that the product: Product Name: High Performance RAID Controller Model Number(s): AcceleRAID 352 Year of Manufacture: 2000 Conforms to the following Product Specification(s): FCC:CFR 47 Part 15, Subpart B, Section 15.107(e) and Section 15.109(g) Class B Digital Device tested per ANSI C63.
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 AcceleRAID 352 Fab. 550157-00 Rev.
Community of Europe Community of Europe CE mark is rated for the AcceleRAID™ 352 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 Statement 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 Statement and Warning F-6 AcceleRAID 352 Installation Guide
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.
AcceleRAID 352 Problem Report Customer Identification AcceleRAID 352 Identification Name: _____________________________________ Date: Purchase Date: Company: __________________________________ Model: Address: ___________________________________ Invoice Number: __________________________________________ Serial Number: __________________________________________ # Chnls: Cache: Country: ___________________________________ Firmware Ver: BIOS Ver: Make/Model/Size/Type of Phone Number:___________________________
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.
