Dell POWEREDGE M1000E - Manual (Page 58)

30 Web Tools Administrator’s Guide
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Refresh rates
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DRAFT: BROCADE CONFIDENTIAL
Refresh rates
Different panels of Web Tools refresh at different rates.
The refresh, or polling, rates listed in this section and throughout the book indicate the time
between the end of one polling period and the start of the next, and not how often the screen is
refreshed. A refresh rate of 15 seconds does not ensure that a refresh occurs every 15 seconds. It
ensures that the time between each refresh activity is no more than 15 seconds.
Autorefresh intervals might be not be exactly 15 seconds. The refresh rate varies depending on the
activity in the fabric and on the host system you are using. Following are some variables you should
consider when refreshing the fabric:
• Retrieval time increases when you are in a large fabric because there is more data to retrieve
from the switches.
• Processor speed of the system you are using may slow down the refresh rate.
• OS-Job Scheduling if you are using a host-system in the data center impacts the refresh rate.
• JVM-Performance can contribute to causing interval differences between what is on-screen
and how long it is actually taking.
For these reasons, the time displayed in the port statistics tab might not be refreshed as expected.
The counter time indicates only that “this statistics data is retrieved from the switch in this time
period.” To ensure the correct information, the time field is updated along with the port statistics
data after every refresh.
The refresh rates are different for each module. Table 6 lists polling rates by module. Though these
rates are sample rates, they correctly illustrate variance in the refresh rates throughout Web Tools.
Displaying switches in the fabric
If your fabric has more than one switch, you can open Web Tools from one switch and then access
other switches. You can also launch Web Tools from the DCFM client as Element Manager. This lets
you manage Web Tool requests in the case where the fabric is in a private network.
Launch Web Tools from DCFM if you need to access the fabric from a host that is not in the same
network and does not have direct access to the fabric.
NOTE
If you open switches running Fabric OS v4.4.x or later from a Fabric Tree displayed for a version
earlier than a v4.4.x switch, some features might be disabled.
TABLE 6 Polling rates
Module Polling rate
Name Server User-defined; 15 sec minimum
Zoning Database 60 sec
Fabric Watch 45 sec
Performance Monitor
(This feature requires the EGM license.) 30 sec
Port Management 60 sec
FC Routing 45–90 sec, depending on network traffic