Veritas Storage Foundation 5.1 SP1 Cluster File System Installation Guide (5900-1510, April 2011)

Table 7-2

I/O fencing configuration files (continued)

DescriptionFile

When I/O fencing starts, the vxfen startup script creates this /etc/vxfentab file on each

node. The startup script uses the contents of the /etc/vxfendg and /etc/vxfenmode files.

Any time a system is rebooted, the fencing driver reinitializes the vxfentab file with the

current list of all the coordinator points.

Note: The /etc/vxfentab file is a generated file; do not modify this file.

An example of the /etc/vxfentab file in a disk-based fencing configuration on one node resembles

as follows:

/dev/vx/rdmp/c1t1d0

/dev/vx/rdmp/c2t1d0

/dev/vx/rdmp/c3t1d0

For server-based fencing, the /etc/vxfentab file also includes the security settings

information.

For server-based fencing with single CP server, the /etc/vxfentab file also includes the

single_cp settings information.

/etc/vxfentab

About planning to configure I/O fencing

After you configure Storage Foundation Cluster File System with the installer,

you must configure I/O fencing in the cluster for data integrity.

You can configure either disk-based I/O fencing or server-based I/O fencing. If

your enterprise setup has multiple clusters that use VCS for clustering, Symantec

recommends you to configure server-based I/O fencing.

The coordination points in server-based fencing can include only CP servers or a

mix of CP servers and coordinator disks. Symantec also supports server-based

fencing with a a single coordination point which is a single highly available CP

server that is hosted on an SFHA cluster.

Warning: For server-based fencing configurations that use a single coordination

point (CP server), the coordination point becomes a single point of failure. In such

configurations, the arbitration facility is not available during a failover of the CP

server in the SFHA cluster. So, if a network partition occurs on any application

cluster during the CP server failover, the application cluster is brought down.

Preparing to configure SFCFS

About planning to configure I/O fencing