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: Compaqs DIGITAL UNIX Version  
4.0B and Compaqs 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  
 
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  
2–1  
2–3  
2–4  
2–6  
2–6  
2–6  
2–7  
2–7  
DS-DWZZH-05 UltraSCSI Hub ................................  
Cabling an HSZ50 to a DS-DWZZH-05 UltraSCSI  
2–8  
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  
 
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  
 
About This Technical Update  
This technical update provides important information about using the  
DS-DWZZH-05 UltraSCSI hub with the TruClusterTM software 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  
v
 
 
1
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 Compaqs  
DIGITAL UNIX Version 4.0D after installation of the following  
operating system patch. The DIGITAL UNIX and TruCluster  
patches are included in one kit.  
Compaqs 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:  
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  
 
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 Users Guide (EK-DWZZH-UG)  
Shared Storage for DIGITAL UNIX Using UltraSCSI Hubs  
(EK-SMA20-AN)  
StorageWorks Solutions BA356-SB 16-Bit Shelf Users Guide  
(EK-BA356-UG)  
1–2 DS-DWZZH-05 UltraSCSI Hub  
 
2
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  
 
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 Drivesa  
Personality  
Moduleb c  
5
4
3
2
1
0
3
2
0
0
0
0
0
2
1
1
0
0
3
4
5
0
0
1
Not Installed  
Installed  
Installed  
Installed  
Installed  
Not Installed  
Not Installed  
Installed  
2–2 Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Configuration  
 
Table 2–1: DS-DWZZH UltraSCSI Hub Maximum Configurations (cont.)  
DS-DWZZH-03  
DW-DWZZH-05  
Disk Drivesa  
Personality  
Moduleb c  
1
1
1
2
3
Installed  
Installed  
0
a
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  
b
c
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  
 
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 Compaqs 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  
 
Figure 2–1: DS-DWZZH-05 Front View  
Fair Disable  
Controller  
Port  
Host Port  
SCSI ID  
6 - 4  
SCSI ID  
2
(14)  
(6 - 0)  
Power  
Host Port  
SCSI ID  
3
Busy  
(15)  
Host Port  
SCSI ID  
0
Host Port  
SCSI ID  
1
(12)  
(13)  
ZK-1447U-AI  
Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Configuration 2–5  
 
Figure 2–2: DS-DWZZH-05 Rear View  
W1  
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  
 
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 Compaqs 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  
 
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  
 
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  
T
KZPSA-BB  
1
1
KZPSA-BB  
DS-DWZZH-05  
T
T
1
T
AlphaServer  
Member  
T
T T  
System 2  
2
4
2
HSZ50  
HSZ50  
1
1
KZPSA-BB  
KZPSA-BB  
T
T
T
AlphaServer  
Member  
System 3  
AlphaServer  
Member  
System 4  
3
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  
 
Table 2–2: Hardware Components Used in the Configuration Shown in  
Figure 2–3  
Callout Number  
Description  
BN38C HD68 to VHDCI cablea b  
H885-AA HD68 trilink connector  
H879-AA HD68 terminator  
BN21K or BN21L HD68 cableb  
1
2
3
4
a
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  
b
(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  
 
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  
T
KZPBA-CB  
1
1
KZPBA-CB  
DS-DWZZH-05  
T
T
4
T
AlphaServer  
Member  
T
T T  
System 2  
2
4
2
HSZ70  
HSZ70  
1
1
KZPBA-CB  
KZPBA-CB  
T
T
T
AlphaServer  
Member  
System 3  
AlphaServer  
Member  
System 4  
3
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  
 
Table 2–3: Hardware Components Used in the Configuration Shown in  
Figure 2–4  
Callout Number  
Description  
BN38C HD68 to VHDCI cablea  
H8861-AA VHDCI trilink connector  
H8863-AA VHDCI terminator  
BN37A VHDCI cableb  
1
2
3
4
a
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  
b
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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