Technical data

______________________ Note _______________________
You cannot use LSM to mirror the member system boot or quorum
disks, but you can use hardware RAID.
Figure 1–5 shows a small cluster configuration with dual SCSI buses using
LSM to mirror the clusterwide root (/), /usr, and /var file systems and
the data disks.
Figure 1–5: Two-Node Configurations with UltraSCSI BA356 Storage Units
and Dual SCSI Buses
Host Bus Adapter (ID 7)
Network
Memory
Channel
Interface
Memory Channel
Memory Channel
Member
System
2
Member
System
1
Tru64
UNIX
Disk
Host Bus Adapter (ID 6)
Host Bus Adapter (ID 6)
Host Bus Adapter (ID 7)
ID 8
ID 9
ID 10
ID 11
ID 12
ID 13
PWR
ID 14 or
PWR
ID 8
ID 9
ID 10
ID 11
ID 12
ID 13
PWR
ID 14 or
PWR
PWR
Clusterwide
/, /usr, /var
Member 1
Boot Disk
Member 2
Boot Disk
Quorum
Disk
ID 5
ID 4
ID 6
ID 3
ID 2
ID 1
ID 0
PWR
Mirrored
/, /usr, /var
ID 5
ID 4
ID 6
ID 3
ID 2
ID 1
ID 0
Redundant
PWR or not
used
Redundant
PWR or not
used
Data Disk
Data Disk
Data Disk
Data Disk
Data Disk
Data Disk
Data Disk
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Mirrored
Data Disk
Not Used
Not Used
Not Used
UltraSCSI
BA356
UltraSCSI
BA356
UltraSCSI
BA356
UltraSCSI
BA356
ZK-1811U-AI
By using LSM to mirror the clusterwide root (/), /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
Introduction 1–13