Using Hardware Raid To Mirror The Clusterwide Root File System And Member System Boot Disks - Compaq TruCluster Server AA-RHGWB-TE Manual

Figure 1–5: Two-Node Configurations with UltraSCSI BA356 Storage Units
and Dual SCSI Buses
Tru64
UNIX
Disk
Memory Channel
Host Bus Adapter (ID 6)
Host Bus Adapter (ID 6)
UltraSCSI
BA356
Clusterwide
ID 0
/, /usr, /var
Member 1
ID 1
Boot Disk
Member 2
ID 2
Boot Disk
Quorum
ID 3
Disk
Data Disk
ID 4
Data Disk
ID 5
Redundant
PWR or not
ID 6
used
PWR
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.
1.6.4 Using 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, or HSG80 could be used instead of the
Network
Member
Memory
System
Channel
1
Interface
UltraSCSI
BA356
ID 8
ID 0
Data Disk
ID 9
ID 1
Data Disk
ID 10
ID 2
Data Disk
ID 11
ID 3
Data Disk
ID 12
ID 4
Data Disk
ID 13
ID 5
Data Disk
Redundant
ID 14 or
PWR or not
ID 6
PWR
PWR
Member
System
2
Memory Channel
Host Bus Adapter (ID 7)
Host Bus Adapter (ID 7)
UltraSCSI UltraSCSI
BA356 BA356
Mirrored Mirrored
/usr, /var Data Disk
Mirrored
Not Used
Data Disk
Mirrored
Not Used
Data Disk
Mirrored
Not Used
Data Disk
Mirrored
Mirrored
Data Disk
Data Disk
Mirrored
Mirrored
Data Disk
Data Disk
ID 14 or
PWR
used
PWR
PWR
ZK-1593U-AI
Introduction 1–13
ID 8
ID 9
ID 10
ID 11
ID 12
ID 13