Related Manuals for Compaq DWZZH
Summary of Contents for Compaq DWZZH
- Page 1 DWZZH 16-Bit UltraSCSI Hub User’s Guide EK–DWZZH–UG. D01 Compaq Computer Corporation...
- Page 2 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. Compaq makes no representations that the interconnection of its products in the manner described in this document...
- Page 3 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...
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Page 5: Table Of Contents
Placement of UltlraSCSI Hubs................2–7 3 SWCC and UltraSCSI Hubs..............3–1 Glossary Figures 1–1 DWZZH–21 or DWZZH-03 3.5" SBB Hub............. 1–2 1–2 DWZZH–21 Front Panel..................1–3 1–3 DWZZH–03 Front Panel..................1–3 1–4 DWZZH–05 5.25" SBB Hub.................. 1–4 2–1 DWZZH–05 SCSI ID Assignments................. 2–3 2–2 DWZZH–05 SCSI Narrow ID Assignments ............ - Page 6 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 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves ....2–8 EK–DWZZH–UG. D01...
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Page 7: Revision Record
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. - Page 8 DWZZH 16-Bit UltraSCSI Hub EK–DWZZH–UG. D01 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.
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Page 9: About This Guide
(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. - Page 10 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.
- Page 11 Storage Solution was purchased. Note: A Service Contract is recommended when the equipment is out of warranty. Who to contact in Asia Pacific For all services, contact the Compaq Distributor or reseller from whom the equipment was purchased. EK–DWZZH–UG. D01...
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Page 13: Introducing The Dwzzh Ultrascsi Hub
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. -
Page 14: Product Descriptions
DWZZH 16-Bit UltraSCSI 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;... -
Page 15: Dwzzh–21 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... -
Page 16: Dwzzh 5.25" Sbb Hubs
DWZZH 16-Bit UltraSCSI 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. -
Page 17: Product Specifications
Chapter 1. Introducing the DWZZH UltraSCSI Hub Product Specifications Table 1-1 lists the functional specifications for the DWZZH Hub. Table 1–1 DWZZH Hub Functional Specifications Feature Specification SCSI ID The small UltraSCSI HUB does not use a SCSI ID. SCSI Addresses The large UltraSCSI HUB uses SCSI ID 7 for arbitration. - Page 18 DWZZH 16-Bit UltraSCSI Table 1–1 DWZZH Hub Functional Specifications (Cont’d) Feature Specification Cable Fault DIFFSENSE support and port disable on cable fault Glitch Elimination 100% glitch free operation during power-up BUSY GLITCH trap eliminates cable length constraint due to wired-OR glitches on the BSY line...
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Page 19: Using The Dwzzh Ultrascsi Hub
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. -
Page 20: Large Hub Addressing Configurations
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 ”... -
Page 21: Narrow Addressing Setting
Chapter 2. Using the DWZZH UltraSCSI Hub Figure 2–1 DWZZH–05 SCSI ID Assignments C on tro lle r P ort H o st P o rt H o st P o rt S C S I ID 6-0 S C S I ID 15... - Page 22 DWZZH 16–Bit UltraSCSI Hub Figure 2–2 DWZZH–05 SCSI Narrow ID Assignments C on tro lle r P o rt H ost P ort H ost P ort S C S I ID 6-4 S C S I ID 3 S C S I ID 2...
- Page 23 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. D01 2–5...
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Page 24: Front Panel
DWZZH 16–Bit UltraSCSI Hub 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... -
Page 25: Indicators
All SCSI buses are terminated at the physical ends of the bus. This is true even when using a DWZZH UltraSCSI Hub. DWZZH UltraSCSI Hubs are factory set to terminate the SCSI bus. No user configuration of the SCSI terminators is required. - Page 26 DWZZH 16–Bit UltraSCSI Hub Table 2-1 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves Number of Number of Small Hubs Large Hubs Number of Personality (DWZZH–03/–21) (DWZZH–05) Disk Drives Module Not installed Installed Installed Installed Installed Not installed Not installed...
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Page 27: Swcc And Ultrascsi Hubs
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. Using SWCC through the client-agent model is very similar to using a serial terminal to access the HSZ70 controller;... - Page 28 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.
- Page 29 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 Host System DWZZH–05 EK–DWZZH–UG. D01...
- Page 31 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.
- Page 32 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.
- Page 33 Differential bus segments use passive (linear totem pole) terminators. except for special cases where the electrical transmission lines are very short and only one termination or pull-up is required. termpower An electrical current that is limited by self-resetting fuses. EK–DWZZH–UG. D01 Glossary–3...
- Page 34 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.