Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 372)

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Server Health Check Probes

When the ICMP Interval timer expires, a server is marked "up" if a response to any probe sent during the ICMP

Interval was received. A server is marked "down" by lack of a response to an ICMP probe only if no response is

received and the server had been marked "up” at least once since the last Equalizer reboot. This is to prevent

marking a server down when it has been configured to ignore ICMP ECHO Requests.

GUI Probe Parameter (CLI Probe Parameter) Description

ICMP Probe Maximum Tries (icmp_maxtries)

The maximum number of times per ICMP Probe Interval that

Equalizer will attempt to probe a server.

ICMP Probe Interval (icmp_interval )

A timer specifying the length of time (in seconds) during which a

successful server probe must occur, or the server is marked

"down". At least one ICMP probe of a server must have succeeded

since the last Equalizer reboot, or failed ICMP probes for the server

will be ignored and the server will be marked "UP."

ICMP Probe Parameters

Setting ICMP Probe Parameters in the GUI

1. Click on Equalizerin the left navigational pane. The Global > Parameters screen will be displayed on the right

configuration pane.

2. Modify the ICMP probe parameter shown in

ICMP Probe Parameters

as necessary.

3. Click on Commit.

Setting ICMP Probe Parameters in the CLI

1. To set ICMP probe parameters in the CLI enter the following command in the global context.

eqcli > parameter_name value [...]

2. Enter a parameter_name and value which are described in

ICMP Probe Parameters

above.

L4 UDP Probes

L4 UDP probes are performed on UDP protocol servers only.

For specific Remote Procedure Call (RPC) services running on well-known ports - Network File System (NFS)

and portmap - an RPC call is sent to the server. If no response is received the server is marked "DOWN".

For the Domain Name System (DNS), a DNS request is sent to the server. If no response is received the server is

marked "DOWN”.

For all other UDP services, a UDP datagram is sent to the server probe port and if no response is received the

server is marked "DOWN".

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