Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 520)

Using Envoy

than other criteria.

Mail Exchanger FQDN

The fully qualified domain name (e.g., "mail.example.com") to be returned if

Equalizer receives a “mail exchanger” request for this GeoCluster. The mail

exchanger is the host responsible for handling email sent to users in the

domain. This field is not required.

Responsiveness

This value controls how aggressively Equalizeradjusts the site’s dynamic

weights. Equalizer provides five response settings: slowest, slow, medium,

fast, and fastest. Faster settings enable Equalizer to adjust its load balancing

criteria more frequently and permit a greater variance in the relative weights

assigned to sites. Slower settings cause site measurements to be averaged over

a longer period of time before Equalizer applies them to the cluster-wide load

balancing; slower settings also tend to ignore spikes in cluster measurements

caused by intermittent network glitches. Use the slider to make your selection.

We recommend that you select the medium setting as a starting point.

Time To Live

The cache time-to-live, which is the length of time (in seconds) that the client’s

DNS server should cache the resolved IP address. Longer times will result in

increased failover times in the event of a site failure, but are more efficient in

terms of network Resources. Use the slider to make your selection. The default

is 120 (that is, 2 minutes).

Multi Response Number

This is the maximum number of Resource records returned in a DNS response

that will be allowed in this GeoCluster. The first address will be the actual

selected GeoSite. Those that follow will be any site which is up in the list of

GeoSites.

ICMP triangulation (option)

When a request for name resolution is received by Envoy from a client’s local

DNS, this option (if enabled) tells Envoy to request network latency information

from all sites in order to make load balancing decisions based on the proximity

of each site to the client’s DNS server.

To do this, all Envoy sites send an ICMP echo request (“ping") to the client’s

DNS server. The reply from the DNS server allows Equalizer to select a site

using the length of time is takes for the DNS server’s reply to reach the site.

(Consequently, this method assumes that the client’s DNS server is

geographically close to the client -- which is usually the case.)

If you do not want Envoy GeoSites to ping client DNS servers, disable this flag

(this is the default setting).

Please note that in order for ICMP triangulation data to be collected at each

GeoSite:

The client’s DNS server must be configured to respond to ICMPv4

echo requests (ICMPv6 is not currently supported for Envoy

triangulation).

The client’s DNS server must be allowed to respond through any

firewalls between it and the Envoy GeoSites.

Note - For all policies, the current site load metric is ignored for the first 10 minutes that the site is up, so that the

metric value is a meaningful measure of the site load before it is used.

Note - In Version 10, if ICMP triangulation is enabled and all GeoSites report that triangulation failed, then ICMP

triangulation is ignored for GeoSite selection. That is, Envoy geographic load balancing will proceed as if ICMP

triangulation were disabled. [In Version 8.6, if no GeoSites successfully completed ICMP triangulation then Envoy would

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