Compaq Switch DS DWZZH 05 User Manual

TruCluster Software Products

Hardware Conﬁguration Technical Update for

DS-DWZZH-05 UltraSCSI Hub

December 1998

Product Version:

TruCluster Production Server

Software Software Version 1.4A and

TruCluster Production Server

Software Version 1.5 and TruCluster

Available Server Software 1.4A and

TruCluster Available Server Software

Version 1.5

Operating System and Version: Compaq’s DIGITAL UNIX Version

4.0B and Compaq’s DIGITAL UNIX

Version 4.0D

This technical update describes how to conﬁgure the DS-DWZZH-05

UltraSCSI hub in a TruCluster Software Products environment.

Compaq Computer Corporation

Houston, Texas

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Contents

About This Technical Update

1 DS-DWZZH-05 UltraSCSI Hub

1.1

1.2

General Overview .....................................................

DS-DWZZH Overview ................................................

1–1

1–2

2 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.7.1

2.7.2

2.7.3

DS-DWZZH-05 UltraSCSI Hub Description .....................

DS-DWZZH-05 Conﬁguration Guidelines ........................

DS-DWZZH-05 Fair Arbitration ...................................

DS-DWZZH-05 Address Conﬁgurations ..........................

SCSI Bus Termination Power ......................................

DS-DWZZH-05 Indicators ...........................................

Conﬁguring a Cluster with a DS-DWZZH-05 ....................

Installing the DS-DWZZH-05 UltraSCSI Hub ..............

Checking the Host Adapter and Cabling it to the Hub ...

Cabling the RAID array Storage Subsystem to the

2–1

2–3

2–4

2–6

2–7

DS-DWZZH-05 UltraSCSI Hub ................................

Cabling an HSZ50 to a DS-DWZZH-05 UltraSCSI

2–8

2.7.3.1

2.7.3.2

Hub ............................................................

Cabling an HSZ70 to a DS-DWZZH-05 UltraSCSI

Hub ............................................................

2–10

Figures

2–1

2–2

2–3

DS-DWZZH-05 Front View ..........................................

DS-DWZZH-05 Rear View ...........................................

TruCluster Conﬁguration Using KZPSA SCSI Adapters, a

DS-DWZZH-05 UltraSCSI Hub, and an HSZ50 RAID Array

Controller ..............................................................

2–5

2–6

2–9

Contents iii

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2–4

TruCluster Conﬁguration Using a KZPBA-CB UltraSCSI

Adapter, a DS-DWZZH-05 UltraSCSI Hub, and an HSZ70

RAID Array Controller ..............................................

2–11

Tables

2–1

DS-DWZZH UltraSCSI Hub Maximum Conﬁgurations ........

2–2

2–10

2–12

2–2

2–3

Hardware Components Used in the Conﬁguration Shown in

Figure 2–3 .............................................................

Hardware Components Used in the Conﬁguration Shown in

Figure 2–4 .............................................................

iv Contents

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About This Technical Update

This technical update provides important information about using the

DS-DWZZH-05 UltraSCSI hub with the TruCluster^TMsoftware products.

Audience

If you plan to use a DS-DWZZH-05 UltraSCSI hub in a TruCluster

hardware conﬁguration, read this addendum to the TruCluster Software

Products Hardware Conﬁguration manual.

Organization

This technical update contains an introductory chapter and a chapter

covering the use and conﬁguration of the DS-DWZZH-05 UltraSCSI hub in

a TruCluster conﬁguration.

About This Technical Update

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DS-DWZZH-05 UltraSCSI Hub

This technical update to the TruCluster Software Products Hardware

Conﬁguration manual provides important information about support for

the DS-DWZZH-05 UltraSCSI hub with the TruCluster Production Server

Software Version 1.4A and TruCluster Production Server Software Version

1.5 and TruCluster Available Server Software Version 1.4A and TruCluster

Available Server Software Version 1.5 products.

1.1 General Overview

The DS-DWZZH-05 UltraSCSI hub was recently qualiﬁed for use with the

TruCluster Production Server Software Version 1.4A and TruCluster

Production Server Software Version 1.5 and TruCluster Available Server

Software Version 1.4A and TruCluster Available Server Software Version

1.5 products.

The KZPSA-BB and KZPBA-CB host adpaters are supported for use with

the DS-DWZZH-05 UltraSCSI hub in TruCluster conﬁgurations with an

HSZ50 or HSZ70 RAID array controller.

_______________________ Note _______________________

The KZPBA-CB UltraSCSI host adapter is only supported on

TruCluster Production Server Software Version 1.5 and

TruCluster Available Server Software Version 1.5 with Compaq’s

DIGITAL UNIX Version 4.0D after installation of the following

operating system patch. The DIGITAL UNIX and TruCluster

patches are included in one kit.

Compaq’s DIGITAL UNIX V4.0D/TCR 1.5 Patch Kit 3

DUV40DAS00003-19981208.tar (or later)

The patch may be obtained from the Software Patch (ECO)

Access Web site by selecting Software Patches at the following

URL:

http://www.service.digital.com/patches/

There is no TruCluster Software Products software release that coincides

with the availability of support for the DS-DWZZH-05 UltraSCSI hub, so

DS-DWZZH-05 UltraSCSI Hub 1–1

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this technical update provides the DS-DWZZH-05 conﬁguration information

that would appear in Chapter 4 of the TruCluster Software Products

Hardware Conﬁguration manual.

1.2 DS-DWZZH Overview

The DS-DWZZH series UltraSCSI hubs are SCSI-2 and draft SCSI-3

compliant SCSI 16-bit signal converters capable of data transfer rates of up

to 40 MB per second. Cluster member systems and HSZ50 or HSZ70 RAID

array controllers are radially connected to the hub ports.

A DS-DWZZH UltraSCSI hub:

•

Improves the reliability of the detection of cable faults.

Provides for bus isolation of cluster systems while allowing the

remaining connections to continue to operate.

•

Allows for more separation of systems and storage in a cluster

conﬁguration because each SCSI bus segment can be up to 25 meters in

length. This allows a total separation of nearly 50 meters between a

system and the storage.

For more information on the DS-DWZZH-05 UltraSCSI hub, see the

following documents:

•

DWZZH 16-Bit UltraSCSI Hub User’s Guide (EK-DWZZH-UG)

Shared Storage for DIGITAL UNIX Using UltraSCSI Hubs

(EK-SMA20-AN)

•

StorageWorks Solutions BA356-SB 16-Bit Shelf User’s Guide

(EK-BA356-UG)

1–2 DS-DWZZH-05 UltraSCSI Hub

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Using the DS-DWZZH-05 UltraSCSI Hub

in a Cluster Conﬁguration

2.1 DS-DWZZH-05 UltraSCSI Hub Description

The DS-DWZZH-05 UltraSCSI hub is supported on TruCluster Available

Server Software Version 1.4A and TruCluster Available Server Software

Version 1.5 and TruCluster Production Server Software Version 1.4A and

TruCluster Production Server Software Version 1.5.

The DS-DWZZH-05:

•

Is a 5.25-inch StorageWorks Building Block (SBB)

Has ﬁve VHDCI differential SCSI bus connectors

Uses SCSI ID 7 whether or not fair arbitration mode is enabled.

Therefore, you cannot use SCSI ID 7 for a RAID array controller or for

the member systems’ SCSI bus adapter.

•

Contains internal termination for each port; therefore, it terminates the

hub end of each SCSI bus segment.

_____________________ Note _____________________

Do not put trilinks on the DS-DWZZH-05 as it is not possible

to remove the DS-DWZZH-05 internal termination.

Requires that termination power (termpwr) be provided by the SCSI

bus host adapters on each SCSI bus segment.

_____________________ Note _____________________

The DS-DWZZH-05 is designed to sense loss of termination

power (such as a cable pull or termpwr not enabled on the

host adapter) and shut down the applicable port to prevent

corrupted signals on the remaining SCSI bus segments.

2.2 DS-DWZZH-05 Conﬁguration Guidelines

The DS-DWZZH-05 UltraSCSI hub can be installed in:

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration 2–1

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•

A StorageWorks DS-BA356 shelf (which has the required 180-watt

power supply).

A wide BA356 which has been upgraded to the 180-watt power supply

with the DS-BA35X-HH option.

_____________________ Note _____________________

Dual power supplies are recommended for any BA356 shelf

containing a DS-DWZZH-05 UltraSCSI hub in order to

provide a higher level of availability between cluster member

systems and storage.

•

The lower righthand device slot of the BA370 shelf within the RA7000

or ESA 10000 RAID array subsystems. This position minimizes cable

lengths and interference with disks.

A DS-DWZZH-05 UltraSCSI hub uses the DS-BA356, BA356, or BA370

shelf only to provide its power and mechanical support (it is not connected

to the shelf internal SCSI bus).

Maximum conﬁgurations with combinations of DS-DWZZH-03 (see

technical update TU-DWZZH-03) and DS-DWZZH-05 UltraSCSI hubs, and

disks in the same DS-BA356 or BA356 storage shelf containing dual

180-watt power supplies are shown in Table 2–1.

_______________________ Note _______________________

With dual 180-watt power supplies installed, there are slots

available for six 3.5-inch SBBs or two 5.25-inch SBBs.

Table 2–1: DS-DWZZH UltraSCSI Hub Maximum Conﬁgurations

DS-DWZZH-03

DW-DWZZH-05

Disk Drives^a

Personality

Module^{b c}

Not Installed

Installed

Not Installed

Installed

2–2 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

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Table 2–1: DS-DWZZH UltraSCSI Hub Maximum Conﬁgurations (cont.)

DS-DWZZH-03

DW-DWZZH-05

Disk Drives^a

Personality

Module^{b c}

Installed

DS-DWZZH UltraSCSI hubs and disk drives may coexist in a storage shelf. Installed disk drives are not

associated with the DS-DWZZH UltraSCSI hub SCSI bus segments; they are on the SCSI bus connected to

the personality module.

If the personality module is installed, you can install a maximum of four DS-DWZZH-03 UltraSCSI hubs.

The personality module must be installed to provide a path to any disks installed in the BA356 or

DS-BA356 shelf.

2.3 DS-DWZZH-05 Fair Arbitration

Although each cluster member system and storage controller connected to

an UltraSCSI hub are on separate SCSI bus segments, they all share a

common SCSI bus and its bandwidth. As the number of systems accessing

the storage controllers increases, it is likely that the adapter with the

highest priority SCSI ID will obtain a higher proportion of the UltraSCSI

bandwidth.

The DS-DWZZH-05 UltraSCSI hub provides a fair arbitration feature that

overrides the traditional SCSI bus priority. Fair arbitration applies only to

the member systems, not to the storage controllers (which are assigned

higher priority than the member system host adapters).

You enable fair arbitration by placing the switch on the front of the

DS-DWZZH-05 UltraSCSI hub to the Fair position (see Figure 2–1).

Fair arbitration works as follows. The DS-DWZZH-05 UltraSCSI hub is

assigned the highest SCSI ID, which is 7. During the SCSI arbitration

phase, the hub, because it has the highest priority, captures the SCSI ID of

all host adapters arbitrating for the bus. The hub compares the SCSI IDs of

the host adapters requesting use of the SCSI bus, and then allows the

device with the highest priority SCSI ID to take control of the SCSI bus.

That SCSI ID is removed from the group of captured SCSI IDs prior to the

next comparison.

After the host adapter has been serviced, if there are still SCSI IDs retained

from the previous arbitration cycle, the next highest SCSI ID is serviced.

When all devices in the group have been serviced, the DS-DWZZH-05

repeats the sequence at the next arbitration cycle.

Fair arbitration is disabled by placing the switch on the front of the

DS-DWZZH-05 UltraSCSI hub in the Disable position (see Figure 2–1).

With fair arbitration disabled, the SCSI requests are serviced in the

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration 2–3

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conventional manner; the highest SCSI ID asserted during the arbitration

cycle obtains use of the SCSI bus.

_______________________ Note _______________________

Host port SCSI ID assignments are not linked to the physical

port when fair arbitration is disabled.

The DS-DWZZH-05 retains SCSI ID 7 regardless of whether fair

aarbitrarion is enabled or not.

2.4 DS-DWZZH-05 Address Conﬁgurations

The DS-DWZZH-05 has two addressing modes; wide addressing mode and

narrow addressing mode. With either addressing mode, if fair arbitration is

enabled, each hub port is assigned a speciﬁc SCSI ID. This allows the fair

arbitration logic in the hub to identify the SCSI ID of the device

participating in the arbitration phase of the fair arbitration cycle.

_____________________ Caution _____________________

If fair arbitration is enabled, The SCSI ID of the host adapter

must match the SCSI ID assigned to the hub port. Mismatching

or duplicating SCSI IDs will cause the hub to hang.

SCSI ID 7 is reserved for the DS-DWZZH-05 whether fair

arbitration is enabled or not.

J umper W1, accessible from the rear of the DS-DWZZH-05 (see Figure 2–2)

determines which addressing mode is used. The jumper is installed to

select narrow addressing mode and is presently the only addressing mode

supported with Compaq’s DIGITAL UNIX operating system. If fair

arbitration is enabled, the SCSI IDs for the host adapters are 0, 1, 2, and 3

(see the port numbers not in parentheses in Figure 2–1). The controller

ports are assigned SCSI IDs 4 through 6, and the hub uses SCSI ID 7.

If jumper W1 is removed, the host adapter ports assume SCSI IDs 12, 13,

14, and 15. The controllers are assigned SCSI IDs 0 through 6. The

DS-DWZZH-05 retains the SCSI ID of 7.

2–4 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

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Figure 2–1: DS-DWZZH-05 Front View

Fair Disable

Controller

Port

Host Port

SCSI ID

6 - 4

SCSI ID

(14)

(6 - 0)

Power

Host Port

SCSI ID

Busy

(15)

Host Port

SCSI ID

Host Port

SCSI ID

(12)

(13)

ZK-1447U-AI

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration 2–5

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Figure 2–2: DS-DWZZH-05 Rear View

ZK-1448U-AI

2.5 SCSI Bus Termination Power

Each host adapter connected to a DS-DWZZH-05 UltraSCSI hub port must

supply termination power (termpwr) to enable the termination resistors on

each end of the SCSI bus segment. If the host adapter is disconnected from

the hub, the port is disabled. Only the UltraSCSI bus segment losing

termination power is affected. The remainder of the SCSI bus operates

normally.

2.6 DS-DWZZH-05 Indicators

The DS-DWZZH-05 has two indicators on the front panel (see Figure 2–1).

The green LED indicates that power is applied to the hub. The yellow LED

indicates that the SCSI bus is busy.

2.7 Conﬁguring a Cluster with a DS-DWZZH-05

The following sections discuss how to conﬁgure a DS-DWZZH-05 UltraSCSI

hub in a TruCluster conﬁguration.

2–6 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

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To conﬁgure a TruCluster conﬁguration using a DS-DWZZH-05 UltraSCSI

hub, follow these steps:

1. Conﬁgure and install the DS-DWZZH-05 UltraSCSI hub (Section 2.7.1)

2. Verify that the host adapter termination is installed and cable the host

adapter to the DS-DWZZH-05 UltraSCSI hub (Section 2.7.2)

3. Cable the RAID array controller to the hub:

•

HSZ50 (Section 2.7.3.1)

HSZ70 (Section 2.7.3.2)

2.7.1 Installing the DS-DWZZH-05 UltraSCSI Hub

All existing versions of Compaq’s DIGITAL UNIX operating systems

support only eight devices on a SCSI bus. Therefore, narrow addressing

mode must be used.

Install the DS-DWZZH-05 UltraSCSI hub as follows:

1. Install the W1 jumper to enable narrow addressing mode (see

Figure 2–2).

2. If fair arbitration is to be used, ensure that the switch on the front of

the DS-DWZZH-05 UltraSCSI hub is in the Fair position.

3. Install the DW-DWZZH-05 UltraSCSI hub in a DS-BA356, BA356 (if it

has the required 180-watt power supply), or BA370 storage shelf.

2.7.2 Checking the Host Adapter and Cabling it to the Hub

At the present time only the KZPSA-BB and KZPBA-CB host adpaters are

supported for use with the DS-DWZZH-05 UltraSCSI hub in TruCluster

conﬁgurations with an HSZ50 or HSZ70 RAID array controller.

See the TruCluster Software Products Hardware Conﬁguration manual and

Hardware Conﬁguration Technical Update for DS-KZPBA-CB and verify

the following:

•

Ensure that the KZPSA-BB termination resistor SIPs (Z1 through Z5)

or KZPBA-CB termination resistors (RM1 through RM8) are installed.

•

If fair arbitration is selected on the DS-DWZZH-05 UltraSCSI hub,

ensure that the host adapter SCSI ID matches the controller port SCSI

ID on the DS-DWZZH-05 for the port that the adapter will be cabled to.

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration 2–7

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•

Ensure that no member systems’ host adapter SCSI ID is set at 7

(because the DS-DWZZH-05 uses SCSI ID 7).

Connect a BN38C cable between the host adapter and the appropriate

DS-DWZZH-05 UltraSCSI hub port. Each connection forms a SCSI bus

segment with the host adapter and the hub. The maximum length of a

SCSI bus segment, including cable and internal device bus length, is 25

meters.

2.7.3 Cabling the RAID array Storage Subsystem to the

DS-DWZZH-05 UltraSCSI Hub

To prepare the storage portion of a cluster using HSZ50 or HSZ70 RAID

Array controllers, see Section 2.7.3.1 and Section 2.7.3.2.

_______________________ Note _______________________

Ensure that the SCSI IDs assigned to the RAID array controllers

are not the same as a SCSI ID assigned to a KZPSA-BB or

KZPBA-CB SCSI adapter (0, 1, 2, or 3 if fair arbitration is

enabled) or the SCSI ID assigned to the DS-DWZZH-05 (7).

2.7.3.1 Cabling an HSZ50 to a DS-DWZZH-05 UltraSCSI Hub

To prepare the storage portion of a cluster using HSZ50 RAID Array

controllers, follow these steps while referring to Figure 2–3 and Table 2–2:

1. Attach an H885-AA trilink connector to each HSZ50 controller on the

SCSI bus segment.

2. Attach an H879-AA terminator to the H885-AA trilink connector on

the HSZ50 controller that will be on the end of the SCSI bus segment.

3. If there are two HSZ50 controllers, connect the two H885-AA trilinks

on the controllers with a BN21K (or BN21L) cable.

4. Connect the DS-DWZZH-05 UltraSCSI hub to the open H885-AA

connector on the HSZ50 with a BN38C cable. The length of any SCSI

bus segment must not exceed 25 meters.

_____________________ Note _____________________

One end of the BN38C cable is 68-pin high density. The

other end is 68-pin VHDCI. The DS-DWZZH-05 accepts the

68-pin VHDCI connector.

2–8 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

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Figure 2–3 shows a sample conﬁguration that uses KZPSA-BB SCSI

adapters, a DS-DWZZH-05 UltraSCSI hub, and an HSZ50 RAID array

controller.

Figure 2–3: TruCluster Conﬁguration Using KZPSA SCSI Adapters, a

DS-DWZZH-05 UltraSCSI Hub, and an HSZ50 RAID Array Controller

AlphaServer

Member

System 1

KZPSA-BB

DS-DWZZH-05

AlphaServer

Member

T T

System 2

HSZ50

KZPSA-BB

AlphaServer

Member

System 3

AlphaServer

Member

System 4

ZK-1449U-AI

_______________________ Note _______________________

The systems shown in Figure 2–3 use KZPSA-BB SCSI

adapters. They could be KZPBA-CB UltraSCSI adapters without

changing any cables in the conﬁguration.

Table 2–2 shows the components used to create the cluster shown in

Figure 2–3.

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration 2–9

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Table 2–2: Hardware Components Used in the Conﬁguration Shown in

Figure 2–3

Callout Number

Description

BN38C HD68 to VHDCI cable^{a b}

H885-AA HD68 trilink connector

H879-AA HD68 terminator

BN21K or BN21L HD68 cable^b

The maximum length of the SCSI bus segment, including BN38C cable and internal device length, must

not exceed 25 meters.

The maximum length of the SCSI bus segment, including the combined length of the BN38C and BN21K

(or BN21L) cables, must not exceed 25 meters.

2.7.3.2 Cabling an HSZ70 to a DS-DWZZH-05 UltraSCSI Hub

To prepare the storage portion of a cluster using HSZ70 RAID array

controllers, follow these steps while referring to Figure 2–4 and Table 2–3:

1. Install an H8861-AA trilink connector on each HSZ70 controller port

on the SCSI bus segment.

2. Attach an H8863-AA terminator to the H8861-AA connector on the

HSZ70 controller that will be on the end of the SCSI bus segment.

3. If there are two HSZ70 controllers, connect the two H8861-AA trilink

connectors on the controllers with a BN37A cable.

4. Connect the DS-DWZZH-05 to the HSZ70 H8861-AA trilink with a

BN37A cable.

_____________________ Note _____________________

The maximum length of a SCSI bus segment, including

cable and internal device SCSI bus length must not exceed

25 meters.

Figure 2–4 shows a sample conﬁguration that uses a KZPBA-CB SCSI

adapter, a DS-DWZZH-05 UltraSCSI hub, and an HSZ70 RAID array

controller.

2–10 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

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Figure 2–4: TruCluster Conﬁguration Using a KZPBA-CB UltraSCSI

Adapter, a DS-DWZZH-05 UltraSCSI Hub, and an HSZ70 RAID Array

Controller

AlphaServer

Member

System 1

KZPBA-CB

DS-DWZZH-05

AlphaServer

Member

T T

System 2

HSZ70

KZPBA-CB

AlphaServer

Member

System 3

AlphaServer

Member

System 4

ZK-1460U-AI

_______________________ Note _______________________

The systems shown in Figure 2–4 use KZPBA-CB UltraSCSI

adapters. They could be KZPSA-BB SCSI adapters without

changing any cables in the conﬁguration.

Table 2–3 shows the components used to create the cluster shown in

Figure 2–4.

Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration 2–11

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Table 2–3: Hardware Components Used in the Conﬁguration Shown in

Figure 2–4

Callout Number

Description

BN38C HD68 to VHDCI cable^a

H8861-AA VHDCI trilink connector

H8863-AA VHDCI terminator

BN37A VHDCI cable^b

The maximum length of the SCSI bus segment, including BN38C cable and internal device length, must

not exceed 25 meters.

The maximum length of the SCSI bus segment, including the combined length, of BN37A cables and

internal device length, must not exceed 25 meters.

2–12 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Conﬁguration

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