Compaq AA-RHGWB-TE - Manual (Page 34)

1.6.3 Two-Node Configurations with UltraSCSI BA356 Storage Units
and Dual SCSI Buses
By adding a second shared SCSI bus, you now have the capability to use the
Logical Storage Manager (LSM) to mirror data disks, and the clusterwide
/usr
and /var file systems across SCSI buses.
______________________ Note _______________________
You cannot use LSM to mirror the clusterwide root (/), member
system boot, swap, 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 /usr and /var file systems and the data
disks.
1–12 Introduction