Symantec 5 manual Preparing to configure disk-based I/O fencing

92Configuring VCS clusters for data integrity Preparing to configure disk-based I/O fencing

/etc/vxfentab

When you run the vxfen startup file to start I/O fencing, the script creates this /etc/vxfentab file on each node with a list of all paths to each coordinator disk. The startup script uses the contents of the /etc/vxfendg and /etc/vxfenmode files.

Thus any time a system is rebooted, the fencing driver reinitializes the vxfentab file with the current list of all paths to the coordinator disks.

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

An example of the /etc/vxfentab file on one node resembles as follows:

■Raw disk:

/dev/sdx

/dev/sdy

/dev/sdz

■DMP disk:

/dev/vx/rdmp/sdx

/dev/vx/rdmp/sdy

/dev/vx/rdmp/sdz

In some cases you must remove disks from or add disks to an existing coordinator disk group.

Warning: If you remove disks from an existing coordinator disk group, then be sure to remove the registration and reservation keys from these disks before you add the disks to another disk group.

Preparing to configure disk-based I/O fencing

Make sure you performed the following tasks before configuring I/O fencing for VCS:

■Install the correct operating system.

■Install the VRTSvxfen RPM when you installed VCS.

■Install a version of Veritas Volume Manager (VxVM) that supports SCSI-3 persistent reservations (SCSI-3 PR).