3.7.0 HP StorageWorks HP Scalable NAS File Serving Software installation guide HP Scalable NAS for Linux (AG513-96004, October 2009)

Configure Fibre Channel switches for the cluster
NOTE:
For all Fibre Channel switches, it is best practice to place each HBA port and its
storage ports in a separate zone. No other initiator HBA port should be present in
this zone.
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 Scalable NAS must remove
the server’s access to filesystems to preserve data integrity. This step is called fencing.
When you configure the cluster later in this procedure, you can select the fencing
method that you want to use:
• Fibre Channel switch-based fencing (also called “fabric fencing”). When a server
needs to be fenced, HP Scalable NAS disables the server’s access in the Fibre
Channel fabric.
• Web management-based fencing (also called “ server-based fencing”). HP Scalable
NAS uses remote management hardware on the server to reset or power off the
server. (HP ProLiant servers (except the 1xx series) support this kind of fencing
using iLO remote management functionality.)
For sites using fabric fencing, the Fibre Channel switches must be configured as
described below to enable cluster operations across the SAN. Configuring the Fibre
Channel switches is not required for sites using server-based fencing. However, if
the switches are configured as described here, certain HP Scalable NAS commands
can return more information.
To configure Fibre Channel switches, complete the following tasks:
• Enable server access to the SAN. Each server that will be in the cluster must be
able to see the disks in the SAN. You may need to enable server ports on the FC
switches or to 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.
• Set the SNMP community string to the desired value. The community string
must be the same for all Fibre Channel switches. If you are using fabric fencing,
ensure that the community string has write privileges. For server-based fencing,
you can optionally configure a read-only community string.
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