HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition Setup Guide (403102-005, January 2008)

Chapter 3: Setting Up HP StorageWorks Clustered File System 27
SAN & Fencing Tab
When certain problems occur on a server (for example, hardware
problems or the loss of cluster network communications), and the server
ceases to effectively coordinate and communicate with other servers in
the cluster, HP Clustered File System must remove the server’s access to
filesystems to preserve data integrity. This step is called fencing.
The SAN & Fencing tab allows you to select the method that HP
Clustered File System should use to remove access to the SAN.
There are two fencing methods:
• FibreChannel switch-based fencing. When a server needs to be
fenced, HP Clustered File System will disable the server’s access in the
FibreChannel fabric. The server must be rebooted to regain access to
the SAN.
• Web management-based fencing. HP Clustered File System uses
remote management hardware on the server to remove its access to
PSFS filesystems. (See the HP Clustered File System Quick Specs on
the HP web site for a list of supported HP ProLiant servers. The server
must support the HP iLO remote management functionality.)
Notes Regarding Fencing
Before configuring fencing, you should be aware of the following:
• If you will be using the FibreChannel Virtual Interconnect modules on
the HP C-Class Blade System, you must configure web mangement-
based fencing. Switch-based fencing cannot be used with these
modules.
• If you will be using IPMI interfaces with web mangement-based
fencing, you will need to change the password from the factory
default. The fencing feature will not work correctly if the password is
not changed.
• ISCSI storage must use web management-based fencing.