HP StorageWorks Clustered File System 3.6.1 Windows Storage Server Edition administration guide (AG515 - 96007, August 2008)

Chapter 3: Introduction to HP Clustered File System 14
Event Notifier Services
HP Clustered File System provides event notifier services that can be
configured to respond when certain cluster events occur. The services can
send an SNMP trap to an SNMP trap forwarding target, send email to
certain addresses, or run a script. Each service can be configured with the
specific events that should trigger a response from the service.
SNMP Service
The HP Clustered File System SNMP service provides tools that can be
used to retrieve all cluster-wide state and status information. See “Using
the HP Clustered File System SNMP Service” on page 36 for more
information.
Cluster Design Guidelines
Be sure to consider the following guidelines when planning the physical
configuration of your HP Clustered File System cluster.
Server Memory
Memory resources are consumed on each cluster server to manage the
state necessary to preserve the coherency of shared filesystems. For this
reason, the servers in the cluster should have approximately equal
amounts of physical memory. As a guideline, the ratio of memory
between the smallest and largest servers should not exceed 2. For
example, the smallest server could have 1 GB of memory and the largest
server 2 GB. If this ratio is exceeded (such as a 256 MB server and a 2 GB
server, with a ratio of 8), paging can increase on the smallest server to the
extent that overall cluster performance is significantly reduced.
Supported Configurations
HP Clustered File System supports multiple FibreChannel switches
configured as a single fabric and multiported SAN disks. iSCSI arrays are
also supported. The following diagrams show some sample cluster
configurations using these components.