Proxy balancer : qu'est ce qu'est le paramètre retry ?

Quelle qu'un peut explique a quoi cq correspond retry

Code:

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<VirtualHost *>
	ServerAdmin webmaster@localhost
	ServerName www.yoursite.com
	DocumentRoot /path/to/your/site/
	<Directory /path/to/your/site/>
		Options MultiViews
		AllowOverride All
		Order allow,deny
		allow from all
	</Directory>

	ErrorLog /var/log/yoursite-error.log

	LogLevel warn

	CustomLog /var/log/yoursite-access.log combined

    <Proxy balancer://tomcatservers>
	BalancerMember ajp://tomcatserver.yoursite.com:8009 route=tomcatA retry=60
        BalancerMember ajp://tomcatserver.yoursite.com:8010 route=tomcatB retry=60
	BalancerMember ajp://tomcatserver.yoursite.com:8011 route=tomcatC retry=60
    </Proxy>

    <Location /javaee>
	Allow From All
        ProxyPass balancer://tomcatservers/javaee stickysession=JSESSIONID nofailover=off
    </Location>

</VirtualHost>