The caching of name-to-IP address information can be performed
at many levels within the network communication software stack. These
levels include within the operating system, the Java™ virtual machine, and within the product components, such as core
groups. Core groups use caching to reduce the overhead that is associated
with IP address name lookup. You can adjust the interval at which
a core group IP cache is cleared.
Before you begin
By default, a core group cache is cleared every 60 minutes.
You can determine the correct time interval for your environment.
About this task
You want to change the length of time that IP addresses are
retained in a core group cache.To change how frequently a core
group cache is cleared:
Procedure
- In the administrative console, click core_group_name.
- In the Additional Properties section, click .
- Change the value that is specified for the IBM_CS_IP_REFRESH_MINUTES
custom property.
A core group cache cannot be cleared more
frequently then once a minute.
If the IBM_CS_IP_REFRESH_MINUTES
property already exists, click on the property name and in the Value
field, specify the length of time, in minutes, you want to wait before
a core group cache is cleared.
If this property does not already
exist, click New and create it:
- In the Name field, specify
IBM_CS_IP_REFRESH_MINUTES
.
- In the Value field specify the length of time, in minutes,
that you want to wait before a core group cache is cleared.
- Click OK and then click Review.
- Select Synchronize changes with nodes, and then
click Save.
- Restart all members of the core group.
Results
After the servers restart, all of the core group members run
with the new discovery protocol setting.