HP StorageWorks Clustered File System 3.2.1 Windows Storage Server Edition Setup Guide (February 2006)

Chapter 3: Setting Up HP StorageWorks Clustered File System 11
• FibreChannel Switch-based fencing (also called “fabric fencing”).
When a server needs to be fenced, HP Clustered File System disables
the server’s access in the FibreChannel fabric.
• Web Management-Based Fencing via Server Reset/Shutdown (also
called “flexible fencing” or “iLO fencing”). HP Clustered File System
uses remote management hardware on the server to remove its access
to PSFS filesystems.
For sites using fabric fencing, the FibreChannel switches must be
configured as described below to enable cluster operations across the
SAN.
Configuring the FibreChannel switches is not required for sites using
flexible fencing. However, if the switches are configured as described
here, certain HP Clustered File System commands can return more
information.
To configure FibreChannel switches:
• Enable server access to the SAN. Each server in the cluster must be
able to access the disks in the SAN. You may need to enable server
ports on the FC switches or change the zoning configuration to give
servers the necessary access to the SAN.
• Modify the SNMP setup. Make the following changes:
– Enable access to the SNMP agent from each server that will be in
the cluster.
– If you use fabric fencing, configure the switch with read/write
access to the private community string. If you use flexible fencing,
read access to the private community string is adequate. (If you
need to use a community string other than private, contact HP
Technical Support.)
– For QLogic switches only, sites using fabric fencing should change
the WriteCommunity attribute to Private. Sites using flexible
fencing should change the ReadCommunity attribute to Private.
For both fencing methods, set the ProxyEnabled attribute to False.