Compaq DWZZH manual

DWZZH 16-Bit UltraSCSI Hub User’s Guide EK–DWZZH–UG. D01 Compaq Computer Corporation[...]

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. Compaq makes no representations that the interconnection of its products in the manner described in this document will not infringe existing or future pate[...]

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 interf[...]

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EK–DWZZH–UG. D01 v Contents Revision Record ……………………………………………………………….. vii About This Guide ………………………………………………………….….. .ix 1 Introducing the DWZZH UltraSCSI Hub 1.1 UltraSCSI Hub Functions ...............................................................[...]

DWZZH 16-Bit UltraSCSI Hub vi EK–DWZZH–UG. D01 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 Storage[...]

EK–DWZZH–UG. D01 vii Revision Record The Revisi on Record provides a concise publi cation history of t his guide. It lists t he 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 Revi[...]

DWZZH 16-Bit UltraSCSI Hub viii EK – DWZZH–UG. D01 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.[...]

EK–DWZZH–UG. D01 ix About This Guide This chapter tells you what this User’s Guide does, identifies the audience, describes the struct ure and contents (chapter- by-chapter) briefly, and tell s you how to get suppor t and services from Compaq. This User’s Guide describes the purpose, function, operation, and use of the DWZZH UltraSCSI Hub ([...]

DWZZH 16–Bit UltraSCSI Hub x EK–DWZZH–UG. D01 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[...]

About This Guide EK–DWZZH–UG. D01 xi Who to contact in Europe Information and Product Questions , Contact the Compaq Distributor or reseller Installation Support, and Installation: from whom the Storage Solution was purchased. For Warranty Service See the Warranty Card packaged with the product. For Remedial Service Contact the Compaq Distribut[...]

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EK–DWZZH–UG. D01 1–1 1 Introducing the DWZZH UltraSCSI Hub This chapter descr ibes the DWZZH Hub functions and availabl e 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 secon[...]

DWZZH 16-Bit UltraSCSI Hub 1–2 EK–DWZZH–UG. D01 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[...]

Chapter 1. Introducing the DWZZH UltraSCSI Hub EK–DWZZH–UG. D01 1–3 Figure 1–2 DWZZH–21 Front Panel NOTE The si ngle–ended s ymbol wit h the downwar d– point ing di amond in Fi gure 1- 2 i ndic ates t hat the lower two connec tors are singl e–ended Ult raSCSI connec tions , whil e the dif ferent ial sy mbol wi th the ri ght–poi nt[...]

DWZZH 16-Bit UltraSCSI Hub 1–4 EK–DWZZH–UG. D01 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 Connect ing a si ngle- ended bus c able t o any differential connector causes the SCSI bus to fail. Figure 1–4 DWZZH–05 5.25&[...]

Chapter 1. Introducing the DWZZH UltraSCSI Hub EK–DWZZH–UG. D01 1–5 1.3 Product Specifications Table 1-1 lists the functional specifications for the DWZZH Hub. Table 1–1 DWZZH Hub Functional Specifications Feature Specification SCSI ID SCSI Addresses The small UltraSCSI HUB does not use a SCSI ID. The large UltraSCSI HUB uses SCSI ID 7 for [...]

DWZZH 16-Bit UltraSCSI Hub 1–6 EK–DWZZH–UG. D01 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 lin[...]

EK–DWZZH–UG. D01 2–1 2 Using the DWZZH UltraSCSI Hub This chapter discusses fair ar bitrat ion of the SCSI bus by t he 5.25" SBB Hub, describes addressing configurations, tells you how to use the large Hub fr ont panel, and gives guidelines for selecting the SCSI cables. UltraSCSI Configuration guidelines are documented in EK-ULTRA-CG. T[...]

DWZZH 16–Bit UltraSCSI Hub 2–2 EK–DWZZH–UG. D01 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 Mos t m anufac tu[...]

Chapter 2. Using the DWZZH UltraSCSI Hub EK–DWZZH–UG. D01 2–3 Figure 2–1 DWZZH–05 SCSI ID Assignments C o n tro ll e r P o rt S C S I ID 6 -0 Hos t Por t S C S I ID 1 5 Hos t P or t SCS I I D 1 4 Ho s t Po r t SCSI I D 13 Ho st Po r t SCSI I D 12 S HR- 1 0 6 9 2.3 Narrow Addressing Setting The large Hub can be used with SCSI bus architect[...]

DWZZH 16–Bit UltraSCSI Hub 2–4 EK–DWZZH–UG. D01 Figure 2–2 DWZZH–05 SCSI Narrow ID Assignments C o n tro ll e r P o rt S C S I ID 6 -4 Ho st Po r t S C S I ID 3 Ho st P o rt SCS I I D 2 Hos t Por t SCSI I D 1 Hos t Por t SCSI I D 0 S HR- 1 0 71[...]

Chapter 2. Using the DWZZH UltraSCSI Hub EK–DWZZH–UG. D01 2–5 Figure 2–3 DWZZH–05 SCSI Narrow Addressing Jumper W1 (To enable narrow addressing mode, install a jumper at W1)[...]

DWZZH 16–Bit UltraSCSI Hub 2–6 EK–DWZZH–UG. D01 2.4 Front Panel Figure 2-4 shows the location of the front panel controls and indicators. Figure 2–4 DWZZH–05 Front Panel Busy Power S HR- 1 0 7 0 Fai r D i sabl e NOTE The black part of the s wit ch i n the di agram indicates the position of the switch. 2.4.1 Fair Arb Disable The large Hu[...]

Chapter 2. Using the DWZZH UltraSCSI Hub EK–DWZZH–UG. D01 2–7 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[...]

DWZZH 16–Bit UltraSCSI Hub 2–8 EK–DWZZH–UG. D01 Table 2-1 Combinations of UltraSCSI Hubs and Devices in StorageWorks Shelves Number of Small Hubs (DWZZH–03/–21) Number of Large Hubs (DWZZH–05) Number of Disk Drives Personality Module 5 0 0 Not installed 4 0 0 Installed 3 0 3 Installed 2 0 4 Installed 1 0 5 Installed 0 2 0 Not installe[...]

EK–DWZZH–UG. D01 3–1 3 SWCC and UltraSCSI Hubs This chapter is intended to provide you with import ant inform ation regarding t he use of StorageWor ks Command Console on SCS I buses t hat have an UltraSCSI Hub. While the informat ion provided here is important , it is essential that you have read the SWCC Manual and Release Notes. 3.1 Agents[...]

DWZZH 16-Bit UltraSCSI HUB 3–2 EK–DWZZH–UG. D01 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 y[...]

Chapter3. SWCC and UltraSCSI Hubs EK–DWZZH–UG. D01 3-3 Figure 3-1 Running One SWCC Agent for a Particular Storage Subsystem BA 370 Cabine t wi t h HS Z 70 C o nt rollers Host S y st em Host S y st em Agent Host S y st em Host S y st em DWZ Z H –05[...]

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EK–DWZZH–UG. D01 Glossary–1 Glossary This Glossary includes an alphabetized listing and brief definition of the abbreviations, acronyms, Compaq-specific refer ences, and other technical terms t hat 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[...]

DWZZH 16–UltraSCSI Hub Glossary–2 EK–DWZZH–UG. D01 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[...]

Glossay EK–DWZZH–UG. D01 Glossary–3 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[...]

DWZZH 16–UltraSCSI Hub Glossary–4 EK–DWZZH–UG. D01 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 tr[...]