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Group
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Sets the real server group number--1 to 256.
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Name
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Sets a name of up to 31 characters for the real server group.
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Real Servers
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The numbers of the selected real servers. Servers are added or removed via the Select Real Servers to Include dialog box accessed by clicking Servers.
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Metric
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Sets the load balancing metric used for determining which real server in the group will be the target of the next client request. The default is leastconns.
round robin--The WSM sends the request to each server in rotation, regardless of how many connections each server has.
leastConnections (leastconns)--This is the default setting. The WSM sends the request to the real server that currently has the least number of connections.
minmisses--The WSM sends all requests for a specific IP address to the same real server.
hash--The WSM sends all requests from the same client to the same real server.
response--The WSM sends the request to the real server with the fastest response time.
bandwidth--The WSM sends the request to the real server with the most available free bandwidth.
For more information, see About load balancing metrics.
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Backup Server
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Sets a backup real server for this group.
If the entire real server group fails, the WSM activates the backup until one of the original real servers becomes operative again.
Also applies if all servers in a real server group reach their maximum connections limit. A backup comes online to provide additional processing power until one of the original servers is desaturated.
The same backup may be assigned to more than one real server group at the same time.
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Backup Group
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Sets a backup real server group for this group. (See Backup Server, above.)
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Health Check
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Sets the type of health check to be performed--icmp, tcp, http, dns, smtp, pop3, nntp, ftp, imap, radius, sslh, script1 through script 16, link, wsp, wtls, ldap, udpdns, arp. The default is tcp. For more information, see Types of real server group health checks.
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Health Check Content
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Defines the specific content to be examined during health checks. The content depends on the type of health check specified in the Health Check field (above).
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Alert on RIP Failure Count
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Specifies a minimum threshold for the number of real servers available (1 - 15). If at any time, the number reaches this minimum limit, a SYSLOG ALERT message is sent to the configured SYSLOG servers stating that the real server threshold has been reached for the concerned server load balancing group. The default threshold is 0, which also means the option is disabled
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Backup
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On the Insert Real Groups dialog box, click the down arrow to choose either Real Server or Real Group as a backup for this group. Then type the server or group number in the text field. (See Backup Server, above.)
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VIP Health Checking
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Enables or disables VIP health checking for a service. This feature is enabled by default. However, it works only when the service has DSR (Direct Server Return) feature enabled. When disabled, the switch uses RIP to perform all health checks, whether DSR is enabled or disabled.
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Servers
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Opens the Servers to Include in Group dialog box (below) from which you can select the servers to add to a real server group.
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