Monitoring Load Balancing
ANM monitors load balancing and allows you to view the information associated with virtual servers, real servers, probes, and load balancing statistics.
This section includes the following topics:
• Monitoring Load Balancing on Virtual Servers, page 17-33
• Monitoring Load Balancing on Real Servers, page 17-37
• Monitoring Load Balancing on Probes, page 17-40
• Monitoring Load Balancing Statistics, page 17-41
Monitoring Load Balancing on Virtual Servers
ANM monitors load balancing and allows you to display the associated virtual server information as shown in the following steps.
Note You can display additional load-balancing information about real servers, such as the number of servers that are functioning properly, and probes, such as viewing if an excessing number of probes are failing, by clicking the hyperlink in the respective columns in Table 17-8.
Procedure
Step 1 Choose Monitor > Devices > device > Load Balancing > Virtual Servers.
Depending on the device type you selected in the device tree, the information described in Table 17-8 appears.
Note For the ACE appliance and the ACE module running A2(3.0), click the Advanced Editing Mode button to show/hide additional load balancing virtual server monitoring fields.
Note If you select a CSS device from the device tree, the navigation path does not include Load Balancing; the path is Monitor > Devices > CSS_device > Virtual Servers.
Table 17-8 Load Balancing Virtual Server Monitoring Information
Device Type Field Description
All Virtual Server Name of the virtual server.
Note If a virtual server is associated with primary and backup server farms, two entries appear in the table: One for the primary server farm and one for the backup server farm.
To view statistics for a selected virtual server, click the virtual server hyperlink. The Virtual Server Details popup window appears containing the individual statistic, associated counter value, and a description of the statistic. Click OK to close the popup window.
IP Address IP address of the virtual server.
Port Port to be used for the specified protocol.
# Rservers Up Number of servers up/Number of total servers configured.
Note You can click on the hyperlink in this column to view statistics for the real servers configured for the specified virtual server. See the “Monitoring Load Balancing on Real Servers” section on page 17-37.
ACEs, CSM # Probes Failed For the ACE, this field displays Number of probes failed/Number of probes configured.
For the CSM, this field displays Number of probes failed.
Note For an ACE, you can click on the number displayed to view the statistics for the probes configured for the specified virtual server. See the
“Monitoring Load Balancing on Probes” section on page 17-40.
Operational Status The state of the server, which can be:
• Inservice—Indicates the server is in service.
• Out of Service—Indicates the server is out of service.
Current Connections
Current number of connections.
Conns/Sec. Number of connections per second that the device receives.
Chapter 17 Monitoring Your Network
Monitoring Load Balancing
ACEs only Device Fully-qualified device name.
Protocol Protocol the virtual server supports, which can be:
• Any—Indicates the virtual server is to accept connections using any IP protocol.
• TCP—Indicates that the virtual server is to accept connections that use TCP.
• UDP—Indicates that the virtual server is to accept connections that use UDP.
Service Policy Policy map applied to the device.
DWS Operating state of the Dynamic Workload Scaling feature for the associated server farm, which can be:
• N/A—Not applicable; the virtual server’s server farm is not configured for Dynamic Workload Scaling.
• Local—The server farm is configured for Dynamic Workload Scaling, but the ACE is load-balancing traffic to the local VM Controller VMs only.
• Expanded—The server farm is configured for Dynamic Workload Scaling and the ACE is sending traffic to the local and remote VM Controller VMs.
Dropped Conns/Sec.
Number of connections per second that the ACE discarded.
Server Farm Name of the server farm associated with the virtual server.
Action Indicates if the device is functioning as a primary server (Primary) or a backup server (Backup).
Algorithm Type of predictor algorithm specified on the load balancer, which can be:
• Roundrobin
• Leastconn
• Hash URL
• Hash Address
• Hash Cookie
• Hash Header
Last Polled Date and time of the last time that ANM polled the device to display the current values. This field appears if viewing virtual server data at a device level or at a device group level in the device tree.
Note The Last Polled time stamp appears in the table heading if viewing virtual server data at a virtual context level.
Table 17-8 Load Balancing Virtual Server Monitoring Information (continued)
Device Type Field Description
Step 2 (Optional) Use the display toggle button ( ) located above the table to control which virtual servers ANM displays as follows:
• Show ANM Recognized Virtual Servers—Displays only virtual servers that match ANM’s virtual server definition (see the “Virtual Server Configuration and ANM” section on page 7-2).
• Show All Virtual Servers—Displays virtual servers that match ANM’s virtual server definition and those that do not match this definition but that ANM can recognize as virtual servers using SNMP polling.
Note The display toggle button displays only when you have the “Display All Virtual Servers in Monitoring & Operations page” advanced setting feature enabled (see the “Managing the Display of Virtual Servers in the Operations and Monitoring Windows” section on page 18-66).
Step 3 (Optional) Use the function buttons described in Table 17-9 to update the virtual server information displayed, view graph information, or view the topology map.
ACE appliance, ACE module running A2(3.0) (Advanced Editing Mode button)
Client Packets/Sec Number of packets per second received from the client.
Client Bytes/Sec Number of bytes per second received from the client.
Server Packets/Sec Number of packets per second received from the server.
Server Bytes/Sec Number of bytes per second received from the server.
Drops/Sec Conn Rate Limit
Number of active connection drops per second based on the connection rate limit of the real server
Drops/Sec Max Conn Limit
Number of active connection drops per second based on the maximum allowable number of active connections to a real server.
ACEs, CSS, CSM Admin Status User-specified status of the virtual server, which can be:
• In Service—Indicates the server is in service.
• Out of Service—Indicates the server is out of service.
Table 17-8 Load Balancing Virtual Server Monitoring Information (continued)
Device Type Field Description
Chapter 17 Monitoring Your Network