failover(4M) DG/UX R4.11 failover(4M)
NAME
failover - failover database
SYNOPSIS
/etc/failover
DESCRIPTION
The /etc/failover directory contains all of the failover database
files used in configuring and maintaining failover. The files in this
directory are used for Operator and Machine Initiated failover, IP
Takeover, and VTC/PTC Failover.
The files within this directory are:
altcommpath file containing information about the alternate
communication paths to be used by the failovermon
monitor. If there are entries in this file, the
failovermon monitor will use them to establish
additional communication paths to the specified
host. Using redundant LAN's or SLIP lines in this
database will reduce the possibility of the
monitor taking control of the physical disks if
the network becomes partitioned.
The format of entries in the altcommpath file is:
hostname Primary name of system to be monitored.
alternate-hostname
The alternate name of the host, on which TCP/IP
communications are to be used when monitoring
hostname.
application file containing application startup scripts to be
executed when a physical disk is failed over.
The format of entries in the application file is:
hostname Name of dual ported host where physical disk is
coming from.
local-diskname
Local disk module specification.
remote-diskname
Remote disk module specification.
application-command
Full pathname to a script that cannot fail, that
will be executed when the disk is failed over to
this host. This script is executed by the
admfailoverdisk command and must contain the path
to the interpreter to be used, as the first line
(eg., #!/bin/sh ). This script must have the
proper permissions on it in order to be executed
by the admfailoverdisk command.
failoverip The entries in this file correspond to the
floating IP addresses that can be cooperatively
managed by this host and the specified host.
This floating IP address is what is used to
provide NFS and telnet/rlogin services to client
systems that want high availability access to
physical disks in a dual-initiator configuration.
This file is only present if the Failover package
is installed.
The format of entries in the failoverip file is:
hostname Name of host to transfer floating IP address to
and from.
float-name Hostname associated with floating IP address.
local-interface-name
Name of network interface associated with
floating IP address on this host.
remote-interface-name
Name of network interface associated with
floating IP address on remote host.
start-on-reboot
A flag indicating whether or not the floating IP
address is to be started when the system is
rebooted. If this value is 1, the rc.failover
script will use the admfailoverip command to
start the floating IP address.
failovervtc The entries in this file correspond to the
controllers setup for VTC/PTC failover.
The format of entries in the failovervtc file is:
primary-controller-name
Name of primary VTC/PTC device on this host.
hostname Name of host that contains the remote backup
VTC/PTC. Set to "None" if a remote backup
controller does not exist for the specified
primary controller.
remote-backup-controller-name
Name of remote backup VTC/PTC device for the
primary VTC/PTC. Set to "None" if a remote
backup controller does not exist for the
specified primary controller.
local-backup-controller-name
Name of local backup VTC/PTC device for the
primary VTC/PTC. Set to "None" if a local backup
controller does not exist for the specified
primary controller.
hosts file containing communications and sync status
information for failover hosts.
This file is only present if the Failover package
is installed.
The format of entries in the hosts file is:
hostname Name of dual-ported host.
communications-path
the word "network" to indicate communications are
via the network.
sync-status
The current sync status of this host with the
specified host. The host is either INSYNC or
NOTSYNC. Before a give or take operation can be
attempted the database state must be INSYNC.
giveaway file containing entries for physical disks that
can be given to other hosts
This file is only present if the Failover package
is installed.
takeaway file containing entries for physical disks that
can be taken from other hosts
This file is only present if the Failover package
is installed.
The format of entries in the giveaway and takeaway files is:
hostname Name of dual ported host to give physical disk to
or take physical disk from.
local-diskname
Local disk module specification.
remote-diskname
Remote disk module specification.
vduname Virtual disk name.
mount-point
File system mount point.
fs-type File system type.
mount-options
File system mount options.
dump-frequency
File system dump frequency.
fsck-passno
File system fsck pass number.
fsid File system id for reservations in NFS takeover.
export File system export flag.
export-options
File system export options.
monitors file containing information about the failovermon
monitors that will run on this system.
The format of entries in the monitors file is:
hostname Name of the system to monitor.
pid The process id of the monitor if it is currently
running. This is written to the file when the
monitor is started.
start-on-reboot
A flag indicating whether or not the monitor is
to be started when the system is rebooted. If
this value is 1, the rc.failover script will use
the failovermon command to start the monitor.
interval Interval in seconds between message cycles
retries Number of times to retry message cycle before
executing lost_pulse action script.
lost-pulse-script
Pathname to user defined script to execute when
pulse is lost. This script is executed by the
failovermon monitor and must contain the path to
the interpreter to be used, as the first line
(eg., #!/bin/sh ). This script must have the
proper permissions on it in order to be executed
by the failovermon monitor.
regain-pulse-script
Pathname to user defined script to execute when
pulse is regained. This script is executed by
the failovermon monitor and must contain the path
to the interpreter to be used, as the first line
(eg., #!/bin/sh ). This script must have the
proper permissions on it in order to be executed
by the failovermon monitor.
FILES
/etc/failover
SEE ALSO
admfailovervtc(1M)
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