DWZZH 16-Bit UltraSCSI Hub User’s Guide EK–DWZZH–UG.
Fourth Edition, November 1998 While Compaq Computer Corporation believes the information included in this manual is correct as of the date of publication, it is subject to change without notice.
Achtung! Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen der Benutzer für entsprechende Gegenmaßnahmen verantwortlich ist. Attention! Ceci est un produit de Classe A. Dans un environnement domestique, ce produit risque de créer des interférences radioélectriques, il appartiendra alors à l’utilisateur de prendre les mesures spécifiques appropriées.
Contents Revision Record………………………………………………………………..vii About This Guide………………………………………………………….…...ix 1 Introducing the DWZZH UltraSCSI Hub 1.1 UltraSCSI Hub Functions ...................................................................................... 1–1 1.2 Product Descriptions............................................................................................... 1–2 1.2.1 DWZZH 3.5" SBB Hubs................................................................................... 1–2 1.2.2 DWZZH 5.
DWZZH 16-Bit UltraSCSI Hub Figures (Cont’d) 3–1 Running One SWCC Agent for a Particular Storage Subsystem ............................. 3–3 Tables 1–1 DWZZH Hub Functional Specifications.................................................................. 1–5 2–1 vi Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves ............... 2–8 EK–DWZZH–UG.
Revision Record The Revision Record provides a concise publication history of this guide. It lists the guide revision levels and release dates, and summarizes the changes. The following revision history lists all revisions of this publication and their effective dates. The publication part number is included in the Revision Level column, with the last entry denoting the latest revision. This publication supports the DWZZH 16-Bit UltraSCSI Hub. Revision Level Date Summary of Changes EK–DWZZH–UG.
DWZZH 16-Bit UltraSCSI Hub EK–DWZZH–UG. D01 viii October 1998 Change Section 2.1, add CAUTION after Section 2.1. Make minor changes to Section 2.3.3; renumber Section 2.3.3 as Section 2.3. Renumber Sections 2.3, 2.4, 2.5, and 2.6 as 2.4, 2.5, 2.6, and 2.7, respectively. EK–DWZZH–UG.
About This Guide This chapter tells you what this User’s Guide does, identifies the audience, describes the structure and contents (chapter-by-chapter) briefly, and tells you how to get support and services from Compaq. This User’s Guide describes the purpose, function, operation, and use of the DWZZH UltraSCSI Hub (the DWZZH Hub or the Hub). The DWZZH Hub allows the connection of up to five ports on one logical SCSI bus.
DWZZH 16–Bit UltraSCSI Hub Document Structure This guide contains the following chapters: Chapter 1. Introducing the DWZZH UltraSCSI Hub This chapter gives brief functional and physical descriptions of the DWZZH Hub and lists significant product specifications. Chapter 2. Using the DWZZH UltraSCSI Hub This chapter gives the procedures for configuring a StorageWorks SCSI bus using a DWZZH Hub. Chapter 3.
About This Guide Who to contact in Europe Information and Product Questions, Installation Support, and Installation: For Warranty Service For Remedial Service Contact the Compaq Distributor or reseller from whom the Storage Solution was purchased. See the Warranty Card packaged with the product. Contact the Compaq Distributor or reseller from whom the Storage Solution was purchased. Note: A Service Contract is recommended when the equipment is out of warranty.
1 Introducing the DWZZH UltraSCSI Hub This chapter describes the DWZZH Hub functions and available versions, and list the Hub functional specifications. The series of DWZZH Hubs are SCSI–2 and draft SCSI–3 (ANSI X379.2/91–10R3) compliant 16-bit converters capable of data transfer rates of up to 40 Mbytes per second. The series of Hubs consists of the following: 1.1 • DWZZH–21 and DWZZH–03 are 3.
DWZZH 16-Bit UltraSCSI Hub 1.2 Product Descriptions There are two classes of DWZZH Hubs: 3.5" SBB Hubs, and 5.25" SBB Hubs. 1.2.1 DWZZH 3.5" SBB Hubs The DWZZH small UltraSCSI Hub (Figure 1-1) comes in two versions. • DWZZH-21 contains two single–ended UltraSCSI connectors and one differential UltraSCSI connector; Figure 1-2 illustrates the front panel. • DWZZH-03 contains three differential UltraSCSI connectors; Figure 1-3 illustrates the front panel.
Chapter 1. Introducing the DWZZH UltraSCSI Hub Figure 1–2 DWZZH–21 Front Panel NOTE The single–ended symbol with the downward– pointing diamond in Figure 1-2 indicates that the lower two connectors are single–ended UltraSCSI connections, while the differential symbol with the right–pointing diamond indicates that the top connector is a differential UltraSCSI connector.
DWZZH 16-Bit UltraSCSI Hub 1.2.2 DWZZH 5.25" SBB Hubs The DWZZH large UltraSCSI Hub (Figure 1-4) comes in a single version that contains five differential UltraSCSI bus connectors. CAUTION Connecting a single-ended bus cable to any differential connector causes the SCSI bus to fail. Figure 1–4 DWZZH–05 5.25" SBB Hub 1.2.3 SCSI Bus Components To install a DWZZH UltraSCSI Hub you will need BN37A and BN38C series SCSI cables.
Chapter 1. Introducing the DWZZH UltraSCSI Hub 1.3 Product Specifications Table 1-1 lists the functional specifications for the DWZZH Hub. Table 1–1 DWZZH Hub Functional Specifications Feature SCSI ID SCSI Addresses Overload Protection DTERMPOWER STERMPOWER Shielding Enclosure & Connectors Power-Up Reset SCSI Bus Reset Single-Ended SCSI Bus Length Ultra (20 megatransfers per second or 40 MB/s) Differential SCSI Bus Length Data Timing Design EK–DWZZH–UG.
DWZZH 16-Bit UltraSCSI Hub Table 1–1 DWZZH Hub Functional Specifications (Cont’d) Feature Cable Fault Glitch Elimination Specification DIFFSENSE support and port disable on cable fault 100% glitch free operation during power-up BUSY GLITCH trap eliminates cable length constraint due to wired-OR glitches on the BSY line Termination Singled-ended Active termination for 16bit operation. Differential Termination for 16bit operation. Service There are no user servicable functions on these products.
2 Using the DWZZH UltraSCSI Hub This chapter discusses fair arbitration of the SCSI bus by the 5.25" SBB Hub, describes addressing configurations, tells you how to use the large Hub front panel, and gives guidelines for selecting the SCSI cables. UltraSCSI Configuration guidelines are documented in EK-ULTRA-CG. These guidelines include a list of all UltraSCSI components and the last few example configurations include an UltraSCSI Hub.
DWZZH 16–Bit UltraSCSI Hub removed from the group and at the next arbitration phase, the remaining highest ID will be serviced. This will continue until all of the IDs in the group have been serviced once. All requests from IDs not contained in the register will be “backed off ” using ID 7. CAUTION Most manufacturers ship host bus adapters with a default SCSI ID of 7. Ensure that the ID is changed BEFORE you establish a connection between the adapter and the Hub.
Chapter 2. Using the DWZZH UltraSCSI Hub Figure 2–1 DWZZH–05 SCSI ID Assignments C on tro lle r P ort S C S I ID 6-0 H ost P ort S C S I ID 1 3 H o st P o rt S C S I ID 15 H o st P o rt S C S I ID 1 4 H ost P ort S C S I ID 1 2 S H R -1 0 6 9 2.3 Narrow Addressing Setting The large Hub can be used with SCSI bus architectures that are limited to eight ID assignments, such as DIGITAL UNIX 4.x and earlier versions. (Figure 2-2 shows narrow ID assignments).
DWZZH 16–Bit UltraSCSI Hub Figure 2–2 DWZZH–05 SCSI Narrow ID Assignments C on tro lle r P o rt S C S I ID 6-4 H o st P o rt S C S I ID 1 2–4 H ost P ort S C S I ID 3 H ost P ort S C S I ID 2 H o st P o rt S C S I ID 0 S H R -1 0 7 1 EK–DWZZH–UG.
Chapter 2. Using the DWZZH UltraSCSI Hub Figure 2–3 DWZZH–05 SCSI Narrow Addressing Jumper W1 (To enable narrow addressing mode, install a jumper at W1) EK–DWZZH–UG.
DWZZH 16–Bit UltraSCSI Hub 2.4 Front Panel Figure 2-4 shows the location of the front panel controls and indicators. Figure 2–4 DWZZH–05 Front Panel Fa ir D isa ble P o w er B u sy S H R -10 7 0 NOTE The black part of the switch in the diagram indicates the position of the switch. 2.4.1 Fair Arb Disable The large Hub contains a switch on the front panel that allows the user to disable the FAIR ARB feature of the Hub.
Chapter 2. Using the DWZZH UltraSCSI Hub 2.4.2 Indicators The large Hub has two indicators on the front panel. The green LED indicates that POWER is applied to the Hub, while the yellow LED indicates that the SCSI bus is BUSY. 2.5 Determining the Configuration The UltraSCSI Hub is used in end–bus SCSI bus configurations only. The SCSI bus segments require TERMPOWER supplied from the remote connection to enable the UltraSCSI Hub port for that segment.
DWZZH 16–Bit UltraSCSI Hub Table 2-1 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves Number of Small Hubs (DWZZH–03/–21) 2–8 Number of Large Hubs (DWZZH–05) Number of Disk Drives Personality Module Not installed 5 0 0 4 0 0 Installed 3 0 3 Installed 2 0 4 Installed 1 0 5 Installed 0 2 0 Not installed 3 1 0 Not installed 2 1 1 Installed 1 1 2 Installed 0 1 3 Installed EK–DWZZH–UG.
3 SWCC and UltraSCSI Hubs This chapter is intended to provide you with important information regarding the use of StorageWorks Command Console on SCSI buses that have an UltraSCSI Hub. While the information provided here is important, it is essential that you have read the SWCC Manual and Release Notes. 3.1 Agents and Storage It is highly recommended that you only run one SWCC agent on one of the servers that can access a particular storage subsystem behind the DS-DWZZH-05 UltraSCSI Hub.
DWZZH 16-Bit UltraSCSI HUB This type of configuration would prevent systems with different SCSI IDs from accessing disks ‘belonging to’ a particular SCSI ID, which promotes data security between servers on a shared SCSI bus; however, it does not prevent SWCC from performing tasks on those disks. In other words, if you set up the SWCC client to have configuration capability (see SWCC documentation) then you can access everything in the storage subsystem, regardless of HSZ70 access ID restrictions.
Chapter3. SWCC and UltraSCSI Hubs Figure 3-1 Running One SWCC Agent for a Particular Storage Subsystem BA370 Cabinet with HSZ70 Controllers Host System Host System Agent Host System EK–DWZZH–UG.
Glossary This Glossary includes an alphabetized listing and brief definition of the abbreviations, acronyms, Compaq-specific references, and other technical terms that are used in this manual and that may be unfamiliar to the reader. adapter See SCSI bus converter. building block shelf See SBB shelf. controller A hardware/firmware device that manages communications on behalf of host systems over the SCSI bus to devices, such as the HSC-series, HSJ-series, and HSZ-series controllers.
DWZZH 16–UltraSCSI Hub host adapter A device that connects the host system I/O bus (for example, a PCI bus) to the storage SCSI bus. A host adapter performs the lower layers of the SCSI protocol and normally operates in the initiator role. initiator A SCSI device that requests another device on the bus to perform an operation. Any device on the bus can be an initiator or a target. logical bus A single-ended, or differential, physical bus connected to a differential, physical bus by a SCSI bus converter.
Glossay SCSI end-bus position The physical location of a controller or a device that contains the SCSI bus termination. SCSI mid-bus position The physical location of a controller or a device that the SCSI bus passes through enroute to the controller or device that contains the SCSI bus termination. SCSI cable A 68-conductor (34 twisted pairs) cable used for differential bus connections.
DWZZH 16–UltraSCSI Hub UltraSCSI An improvement in SCSI technology invented in 1993 by the Compaq Computer Corporation StorageWorks Engineering Group. Subsequently the ANSI SCSI Standards Committee issued standard X3T10 for UltraSCSI. The UltraSCSI improvements over Fast SCSI include the following: • Maximum transfer rate increases from 10 MHz to 20 MHz. VHDCI Very High Density Cable Interconnect Glossary–4 EK–DWZZH–UG.
