Technical data

executing in a cluster. They can access their disk data from any member
in the cluster.
• Like the TruCluster Production Server Software product, TruCluster
Server lets you run components of distributed applications in parallel,
providing high availability while taking advantage of cluster-specific
synchronization mechanisms and performance optimizations.
TruCluster Server augments the feature set of its predecessors by allowing
all cluster members access to all file systems and all storage in the cluster,
regardless of where they reside. From the viewpoint of clients, a TruCluster
Server cluster appears to be a single system; from the viewpoint of a system
administrator, a TruCluster Server cluster is managed as if it were a single
system. Because TruCluster Server has no built-in dependencies on the
architectures or protocols of its private cluster interconnect or shared storage
interconnect, you can more easily alter or expand your cluster’s hardware
configuration as newer and faster technologies become available.
1.2 Memory Requirements
The base operation system sets a minimum requirement for the amount of
memory required to install Tru64 UNIX. In a cluster, each member must
have at least 64 MB more than this minimum requirement. For example, if
the base operating system requires 128 MB of memory, each system used in
a cluster must have at least 192 MB of memory.
1.3 Minimum Disk Requirements
This section provides an overview of the minimum file system or disk
requirements for a two-node cluster. For more information on the amount
of space required for each required cluster file system, see the Cluster
Installation manual.
1.3.1 Disks Needed for Installation
You need to allocate disks for the following uses:
• One or more disks to hold the Tru64 UNIX operating system. The disks
are either private disks on the system that will become the first cluster
member, or disks on a shared bus that the system can access.
• One or more disks on a shared SCSI bus to hold the clusterwide root (/),
/usr, and /var Advanced File System (AdvFS) file systems.
• One disk per member, normally on a shared SCSI bus, to hold member
boot partitions.
1–2 Introduction