Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 437)

When Equalizers are configured into a failover group, they continually probe (or heartbeat) each other so that a

backup peer can assume the primary role, should the active primary unit become unreachable.

Heartbeat probes are performed over a long-lived TCP connection. Whenever Equalizer starts heartbeating a peer,

it opens a heartbeat connection to the peer which remains open for as long as the two systems are operational and

have network connectivity. All heartbeats between the two peers will occur over this long-lived connection.

Heartbeat probes are configured using the following parameters. The parameters are listed first by their label in the

GUI, with the CLI parameter name in parentheses.

Once failover is configured, it is the system with the "greater" system ID that always

starts the heartbeating process. For example, of one "sysid" is "003048BC2C8A" and the

other is "003048D52AA2". The second "sysid" has a higher hex value and will start the

heartbeating process.

Global and Subnet Failover Parameters:

These parameters are defined at both the global and subnet levels; the subnet value will override the global value.

Heartbeat Interval (hb_interval)- The time in seconds (default:2) between sending and receiving

heartbeat probes between Equalizer and a peer. Each peer expects to receive a heartbeat probe from other

peers that have a failover IP address on a subnet within this interval.

Failed Probe Count (strike_count) - The number of successive failed heartbeats that must occur

before a peer is marked "down" (default:3). A heartbeat is considered to have failed whenever the Heartbeat

Interval has elapsed and no probe has been received from a peer during that interval.

Failover occurs if:

l The number of failed probes on any single subnet equals or exceeds the Failed Probe Count for that subnet.

l The number of subnets with a Failed Probe Count greater than 0 equals or exceeds the global Failed Probe

Count.

Global Failover Parameters:

These parameters are defined at the global level only and cannot be overridden.

Retry Interval (retry_interval) - Time in seconds (default:5) between checks for changes in

Equalizer’s configuration, for the purpose of determining whether a configuration transfer to the remote peer

is required.

The Retry Interval is also used when any failover operation other than heartbeating fails. For

example, if the system is rebooted and a VLAN health check fails, we try again at this

interval.

Connect Timeout (conn_timeout) - Time in seconds (default:1) to wait for a TCP connection to be

established between peers.

Receive Timeout (recv_timeout) - Time in seconds (default:1) after a TCP connection is established,

of how long a peer waits for the other peer’s response.

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Equalizer Administration Guide

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Coyote Point Systems Equalizer Especificaciones Pagina 437