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Manual Chapter: Viewing Statistics
Manual Chapter
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One of the most important aspects to managing a network is timely access to accurate information on network performance. This information can verify that the Link Controller system is handling your name resolution requests as efficiently as possible, as well as provide data on the overall performance of a specific resource, such as a data center or distributed application.
The Link Controller system gathers statistical data on multiple aspects of your network. You access these statistics through the statistics screen. The types of statistics you can select from this screen include:
The Link Controller system gathers statistics through a software component called the big3d agent. This agent is responsible for managing the various monitors that you assign to your network components, and returning statistics based on those monitors back to the Link Controller system.
Both methods open the same screen within the Link Controller system. When you access statistics through a menu on the main screen for a given network component, the Statistics screen is pre-configured for the given network element, although you can switch to a different set of statistics at any time.
1.
On the Main tab of the navigation pane, expand Overview and then click Statistics.
The Statistics screen opens.
2.
From the Statistics Type list, select the type of statistics you want to view.
These statistics are described in later sections of this chapter.
If you select Normalized, the Link Controller system rounds the data to the nearest digit.
If you select Unformatted, the Link Controller system displays the exact value to as many decimal places as the value requires.
4.
From the Auto Refresh list, select the frequency at which the Link Controller system refreshes data on the screen.
If you select Disabled from this list, the system does not refresh the screen; instead, you can click the Refresh button to update the screen with the latest statistical data.
1.
On the Main tab of the navigation pane, expand Link Controller and click a component, such as Links.
The main screen for the component opens.
2.
On the menu bar, click Statistics.
The Statistics screen opens. This screen is pre-configured to display statistics relevant to the component.
If you select Normalized, the Link Controller system rounds the data to the nearest digit.
If you select Unformatted, the Link Controller system displays the exact value to as many decimal places as the value requires.
4.
From the Auto Refresh list, select the frequency at which the Link Controller system refreshes data on the screen.
If you select Disabled from this list, the system does not refresh the screen; instead, you can click the Refresh button to update the screen with the latest statistical data.
Wide IPs
The statistics for wide IPs provide you with information on what wide IPs exist and how the Link Controller system has load balanced traffic to the wide IP.
Wide IP members
The statistics for wide IP members provide details on the resources that are a part of a specific wide IP.
Links
The statistics for links focus on how much traffic is flowing in and out through a specific link to the Internet.
Paths
The statistics for paths provide information on how quickly traffic moves between a Local DNS and a resource for which the Link Controller system is responsible.
Local DNS
The statistics for local DNS servers provide location details related to the different Local DNS servers that communicate with the Link Controller system.
The Link Controller system captures several statistics related to the performance of a wide IP. These statistics primarily focus on how many resolution requests have been sent for the wide IP, and how the Link Controller system has load balanced these requests. You can access the wide IP statistics by selecting Wide IPs from the Statistics Type list in the Statistics screen. For information on accessing the Statistics screen, see Accessing statistics.
As an example of wide IP statistics, consider the fictional company SiteRequest. The IT department at SiteRequest has a wide IP, www.siterequest.com, which uses the Global Availability load balancing mode. This mode sends all name resolution requests for this wide IP to a specific pool until that pool is unavailable. Because the wide IP, www.siterequest.com, is critical to SiteRequests operations, the IT department wants to track traffic to the wide IP and ensure that the primary pool is not at risk of getting overloaded. The wide IP statistics provide the IT department the information they need to see how many requests are being sent for the wide IP, allowing them to plan additional resource allocations more effectively.
Status
The Status column indicates the current status of the wide IP. The available status types are: Available, Unavailable, Offline, and Unknown. Each status type is represented by a symbol; for example, the available status type is represented by a green circle.
Wide IP
The Wide IP column displays the name of a wide IP for which the Link Controller system is responsible. Each name appears as a link. When you click the link, the properties screen for the wide IP opens.
Members
The Members column provides a link that opens a member details screen for the wide IP. This screen displays load balancing statistics for each resource within the wide IP. You can return to the main wide IP statistics screen by clicking the Back button in the Display Options area of the screen.
Requests
The Requests column displays the cumulative number of DNS requests sent to the wide IP.
Requests Persisted
The Requests Persisted column displays the cumulative number of requests that persisted. Persisted requests use the same pool during a connection session.
Load Balancing
The Load Balancing column provides information on how the Link Controller system load balanced connection requests to this resource. This column consists of four subcolumns:
The Preferred subcolumn displays the cumulative number of requests that the Link Controller system load balanced with the preferred load balancing method.
The Alternate subcolumn displays the cumulative number of requests that the Link Controller system load balanced with the alternate load balancing method.
The Fallback subcolumn displays the cumulative number of requests that the Link Controller system load balanced with the Fallback load balancing method.
The Returned to DNS subcolumn displays the cumulative number of requests that the Link Controller system could not resolve and returned to the Domain Name Server (DNS).
Wide IP member statistics provide information on the amount of traffic flowing to and from each resource that belongs to a specific wide IP. This information can tell you if your resources are distributed appropriately for your network. You can access the virtual server statistics by selecting Wide IP Members from the Statistics Type list in the Statistics screen.
As an example of how the statistics for servers can help you manage your network resources, consider the fictional company SiteRequest. SiteRequest recently added a new wide IP, www.SiteRequestAsia.com, to their Tokyo data center, and the IT department wants to see how the Link Controller system at that data center load balances traffic for that wide IP across multiple resources. By using the wide IP member statistics available through the Link Controller system, the IT department can monitor the performance of the resources that belong to the wide IP, allowing them to determine if more resources are required for the new wide IP.
Status
The Status column indicates the current status of the wide IP member. The available status types are: Available, Unavailable, Offline, and Unknown. Each status type is represented by a symbol; for example, the available status type is represented by a green circle.
Wide IP Member
The Wide IP Member column displays the name or IP address of a resource that belongs to a wide IP. Each name appears as a link. When you click the link, the properties screen for the resource opens.
Wide IP
The Wide IP column displays the name of the wide IP to which the resource belongs. Each wide IP appears as a link. When you click the link, the properties screen for the wide IP opens.
Load Balancing
The Load Balancing column provides information on how the Link Controller system has load balanced previous connection requests to this resource. This column consists of four subcolumns:
The Preferred subcolumn displays the cumulative number of requests that the Link Controller system load balanced with the preferred load balancing method.
The Alternate subcolumn displays the cumulative number of requests that the Link Controller system load balanced with the alternate load balancing method.
The Fallback subcolumn displays the cumulative number of requests that the Link Controller system load balanced with the Fallback load balancing method.
Link statistics focus on how much traffic is flowing in and out through a specific link to the Internet. This information can help you prevent a link from being over-used, saving your organization from higher bandwidth costs. You can access the link statistics by selecting Links from the Statistics Type list in the Statistics screen. For information on accessing the Statistics screen, see Accessing statistics.
As an example of how the statistics for data centers can help you manage your network resources, consider the fictional company SiteRequest. SiteRequest has two links with two different Internet Service Providers (ISPs). The primary ISP is paid in advance for a specific amount of bandwidth usage. This allows SiteRequest to save money, but if the bandwidth exceeds the prepaid amount, the costs increase considerably. As a result, the IT department uses a second ISP, which has a slower connection but considerably lower costs. By using the links statistics, the IT department can ensure that links to the Internet are used as efficiently as possible.
Status
The Status column indicates the current status of the link. The available status types are: Available, Unavailable, Offline, and Unknown. Each status type is represented by a symbol; for example, the available status type is represented by a green circle.
Link
The Link column displays the name of a link for which the Link Controller system is responsible. Each name appears as a link. When you click the link, the properties screen for the link opens.
Throughput (bits/sec)
The Throughput (bits/sec) column contains four subcolumns:
The Over Prepaid displays the amount of traffic, in bits per second, that has exceeded the prepaid traffic allotment for the link.
In addition to viewing the link data as a table, you can also view it in a graph format. To use this format, click the Graph button. A graph screen opens, which shows the amount of traffic used over time. You can change the amount of time shown in the graph by selecting a value from the Graph Interval list, located in the Display Options area of the screen.
The paths statistics captured by the Link Controller system provide information on how quickly traffic moves between a Local DNS and a resource for which the system is responsible. Information presented in the paths statistics screen includes details on round trip times (RTT), hops, and completion rates. You can access the paths statistics by selecting Paths from the Statistics Type list in the Statistics screen. For information on accessing the Statistics screen, see Accessing statistics.
Paths statistics are primarily used when you employ a dynamic load balancing mode for a given wide IP or pool. You can use the information in the Paths statistics to get an overall sense of how responsive your wide IPs are in relation to the Local DNS servers that have been sending name resolution requests to a wide IP.
Local DNS Address
The Local DNS Address column displays the IP address of each Local DNS that has sent a name resolution request for a wide IP for which the Link Controller is responsible.
Link
The Link column displays the ISP link that the Link Controller used to send and receive data from the Local DNS.
Round Trip Time (RTT)
The Round Trip Time (RTT) column contains two subcolumns:
Hops
The Hops column contains two subcolumns:
The Average subcolumn displays the average number of hops between the Local DNS and the Link Controller.
Completion Rate
The Completion Rate column contains two subcolumns:
The Current subcolumn displays the current completion rate of transactions between the Local DNS and the Link Controller.
The Average subcolumn displays the average completion rate of transactions between the Local DNS and the Link Controller.
The Local DNS statistics screen provides location details related to the different Local DNS servers that communicate with the Link Controller. These statistics include the geographical location of the Local DNS as well as the last time that Local DNS accessed the Link Controller.You can access the local DNS statistics by selecting Local DNS from the Statistics Type list in the Statistics screen.
As an example of how the statistics for servers can help you manage your network resources, consider the fictional company SiteRequest. SiteRequest is currently considering whether it needs a new data center in North America to ensure that its customers can access SiteRequests Web site as effectively as possible. To help make their decision, the IT department uses the Local DNS statistics to see where most of their European traffic is coming from. By using these statistics, the IT department discovers that a high concentration of Local DNS servers accessing SiteRequest is in the southwest United States. This information proves helpful in determining that a new data center in Las Vegas might be appropriate.
IP Address
The IP Address column displays the IP address of each Local DNS that has sent a name resolution request for a wide IP for which the Link Controller is responsible.
Requests
The Requests column displays the number of times this Local DNS has made a name resolution request that the Link Controller handled.
Last Accessed
The Last Accessed column displays the last time the Local DNS attempted a connection to the Link Controller.
Location
The Location column contains four subcolumns:
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