Installation guide

43
Wi-Fi Location-Based Services—Design and Deployment Considerations
OL-11612-01
Installation and Configuration
more frequently and in advance of a low disk space situation. These aggressive data pruning intervals
may need to be combined with a shorter history archive interval if the low disk free space situation is not
addressed.
Configuring Location Server Advanced Parameters
The configuration of Location Server > Administration > Advanced Parameters is discussed in the
document entitled Cisco Wireless Location Appliance Configuration Guide: Editing Advanced
Parameters at the following URL:
http://www.cisco.com/en/US/products/ps6386/products_configuration_guide_chapter09186a00806b5b
10.html#wp1046730.
Further clarification regarding some of these parameters is provided in the following subsections.
Absent Data Cleanup Interval
The “Absent Data Cleanup Interval” specifies the amount of time that an entry is kept for a discovered
entity (station, tag, rogue AP, or client) in the “live” (as opposed to the “historical”) location before the
entry is discarded. Therefore, if a station was last seen two days ago and the cleanup interval is set to a
value of 1440 minutes (1 day), the station is removed from the “live” server database. The default value
for absent data cleanup interval is 1440 minutes.
Memory Information
• DB Disk Memory—This name does not refer to “memory” on the location appliance at all, but rather
this value displays the amount of disk space that has been consumed by the location server database.
This information is useful when determining whether a database de-fragmentation should be
performed (see Advanced Commands, page 43) because de-fragmentations have been found to be
particularly helpful in restoring lost performance, especially when database sizes tend to get large
(> 1 GB).
• Run Java GC—This command runs memory clean-up immediately. Normally, memory cleanup is
initiated by the system automatically and thus does not require manual initiation. Therefore, Java
General Cleanup need only be run when directed by the Cisco Technical Assistance Center (TAC)
or Cisco Engineering.
Advanced Commands
The Defragment Database advanced command defragments the location database and reclaims allocated
but unused disk space. A database defragmentation can be beneficial if free disk space on the location
appliance is running low because of large database size, or if the response time of the location appliance
is noticeably slower when data is requested from it by WCS.
To determine how much free space is currently available on the location appliance, it is necessary to log
into the location appliance via either the CLI serial console or an SSH session. When logged in, use the
Linux command df -H to display disk free space, as follows:
[root@AeS_Loc root]# df -H
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 77G 3.2G 70G 5% /
/dev/sda1 104M 16M 83M 16% /boot
none 526M 0 526M 0% /dev/shm
[root@AeS_Loc root]#