fod(1M) (Sun Enterprise 10000 SSP 3.5 Reference Manual)

Sun Enterprise 10000 SSP 3.5 Reference Manual

fod(1M)

NAME

fod- failover daemon

SYNOPSIS

fod

CAUTION

Do not execute this program manually. The SSP startup script invokes this program, then monitors and restarts it as needed.

DESCRIPTION

The fod daemon constantly monitors the health of dual SSPs and control boards in a Sun Enterprise 10000 platform. In a dual configuration, one SSP serves as the main SSP, while the other SSP functions as a backup in case the main SSP fails. Similarly, one control board serves as the primary control board, while the other control board serves as a backup in case the primary control board fails.

fod monitors the connections between the following:

The main and spare SSP
The main and spare SSP with the Sun Enterprise 10000 domains
The main and spare SSP with the Sun Enterprise 10000 control boards

In addition, fod monitors the SSP operating resources, such as disk space and memory usage. When fod detects a failure that prevents the proper operation of the main SSP, fod triggers either an SSP failover or a control board failover depending on the type of failure.

The fod daemon runs on both the main and spare SSP. Each SSP runs only one fod daemon at a time. The fod daemon on both SSPs communicate with each other and the control board executive (CBE), which runs on the Sun Enterprise 10000 control boards, through the Failover Protocol (FOP). FOP is an application-level protocol built on top of Transmission Control Protocol/Internet Protocol (TCP/IP).

FILES

The following files are supported:

$SSPVAR/.ssp_private/ssp_resource: SSP resource file
$SSPVAR/.ssp_private/domain_config: Domain configuration file
$SSPVAR/.ssp_private/cb_config: Control board configuration file
$SSPVAR/pids/fod-platform_name.pid: Process ID file
$SSPVAR/doors/fod: Solaris door file