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User’s Guide – version 3.1.3 NetFlow Tracker
57
Performance Tuning
There are several factors that influence how quickly a given report is generated:
Disk Speed
The first step in creating a report is reading the raw data from disk; increasing the
speed of the disk subsystem will make reporting faster. A high-quality server RAID card
running a striped pattern such as RAID 5 over fast disks is recommended; more disks
will make the array faster. In addition, extra RAM can be used by the operating system
for a disk cache.
Query Size
The amount of raw data that needs to be read from disk is dependent on the number
of source devices selected, the data load of those devices and the amount of time
selected. Indexes are not used due to the increase in database size they would cause,
so any other filters have no impact on the amount of raw data read from the disk.
If possible, avoid reporting over multiple devices and over long periods of time. It is
likely that a report over multiple devices will account for some traffic multiple times.
Database Server Settings
The database server used by NetFlow Tracker can be tuned to improve query speed if
you have a fast disk subsystem or lots of RAM, or both. See Database Settings
for
details.