3.6.0 Matrix Server 3.6.0 Administration Guide (5697-7081, December 2007)

Chapter 16: Configure Service Monitors 192

severity, Start scripts, and Stop scripts) are consistent across all servers

configured for a virtual host.

Service Monitors and Failover

If a monitored service fails, Matrix Server attempts to relocate any virtual

hosts associated with the service monitor to a network interface on a

healthier server. However, if there are multiple failures in the matrix or

the virtual host does not have a backup network interface on another

server, Matrix Server may not be able to move the virtual host. The virtual

host may then remain active on a server with a failed monitored service.

Matrix Server will avoid this situation if there is a healthy server

configured and available, but sometimes it may not be possible in a

multiple-failure scenario.

Types of Service Monitors

Matrix Server supports the following service monitors. When you

configure a monitor, you will need to supply the following information.

Type Port

Default

Probe

Timeout

Default

Probe

Frequency Other Parameters

DNS 53 5 seconds 30 seconds IP address to resolve

FTP 21 5 seconds 30 seconds none

HTTP 80 5 seconds 30 seconds URL

HTTPS 443 5 seconds 30 seconds URL

IMAP4 143 5 seconds 30 seconds none

NNTP 119 5 seconds 30 seconds none

NTSERVICE

NA 15 seconds 30 seconds whether to start

dependent services

POP3 110 5 seconds 30 seconds none

SMTP 25 5 seconds 30 seconds none

TCP 0 5 seconds 30 seconds none

CUSTOM NA 60 seconds 60 seconds user probe script