Compaq AA-RHGWC-TE manual 12Introduction

Figure 1–5: Two-Node Configurations with UltraSCSI BA356 Storage Units and Dual SCSI Buses

Network

Tru64

UNIX

DiskMember

System

1

Memory Channel

Host Bus Adapter (ID 6)

Host Bus Adapter (ID 6)

Memory	Member
	System
Channel	2
Interface
	Memory Channel
	Host Bus Adapter (ID 7)
	Host Bus Adapter (ID 7)

ID 0

ID 1

ID 2

ID 3

ID 4

ID 5

ID 6

UltraSCSI

BA356

Clusterwide /, /usr, /var

Member 1 Boot Disk

Member 2 Boot Disk

Quorum

Disk

Data Disk

Data Disk

Redundant PWR or not used

PWR

UltraSCSI

BA356

ID 8

Data Disk

ID 9

Data Disk

ID 10

Data Disk

ID 11

Data Disk

ID 12

Data Disk

ID 13

Data Disk

ID 14 or

PWR

PWR

	UltraSCSI	UltraSCSI
	BA356	BA356
ID 0	Mirrored	Mirrored
	/usr, /var	Data Disk
ID 1	Not Used	Mirrored
		Data Disk
ID 2	Not Used	Mirrored
		Data Disk
ID 3	Not Used	Mirrored
		Data Disk
ID 4	Mirrored	Mirrored
	Data Disk	Data Disk
ID 5	Mirrored	Mirrored
	Data Disk	Data Disk
	Redundant	ID 14 or
ID 6	PWR or not	PWR
	used
	PWR	PWR

ID 8

ID 9

ID 10

ID 11

ID 12

ID 13

ZK-1593U-AI

By using LSM to mirror the /usr and /var file systems and the data disks, we have achieved higher availability. But, even if you have a second Memory Channel and redundant networks, because we cannot use LSM to mirror the clusterwide root (/), quorum, or the member boot disks, we do not have a no-single-point-of-failure (NSPOF) cluster.

1.5.4Using Hardware RAID to Mirror the Clusterwide Root File System and Member System Boot Disks

You can use hardware RAID with any of the supported RAID array controllers to mirror the clusterwide root (/), quorum, and member boot disks. Figure 1–6 shows a cluster configuration using an HSZ70 RAID array controller. An HSZ40, HSZ50, HSZ80, HSG60, or HSG80 could be used

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