Chapter 30 – WAN Optimization, Web Cache, Explicit Proxy, and WCCP

 

Toggling Disk Usage for logging or wan-opt

Both logging and WAN Optimization use hard disk space to save data. For FortiOS 5.4 you cannot use the same hard disk for WAN Optimization and logging.

• If the FortiGate has one hard disk, then it can be used for either disk logging or WAN optimization, but not both. By default, the hard disk is used for disk logging.
• If the FortiGate has two hard disks, then one disk is always used for disk logging and the other disk is always used for WAN optimization.

On the FortiGate, go to System > Advanced > Disk Settings to switch between Local Log and WAN Optimization.

 

You can also change disk usage from the CLI using the following command:

configure system global

set disk-usage {log | wanopt}

end

 

The Toggle Disk Usage feature is supported on all new “E” Series models, while sup- port for “D” Series models may vary.

Please refer to the Feature Platform Matrix for more information.

Changing the disk setting formats the disk, erases current data stored on the disk and disables either disk logging or WAN Optimization.

You can configure WAN Optimization from the CLI or the GUI. To configure WAN Optimization from the GUI you must go to System > Feature Select and turn on WAN Optimization.

Remote logging (including logging to FortiAnalyzer and remote Syslog servers) is not affected by using the single local hard disk for WAN Optimization.

 

Enabling WAN Optimization affects more than just disk logging

In addition to affecting WAN Optimization, the following table shows other features affected by the FortiGate disk configuration.

to multiple CPU Cores Proxy, and WCCP

 

 

Features affected by Disk Usage as per the number of internal hard disks on the FortiGate

Feature	Logging Only (1 hard disk)	WAN Opt. Only (1 hard disk)	Logging & WAN Opt. (2 hard disks)
Logging	Supported	Not supported	Supported
Report/Historical FortiView	Supported	Not supported	Supported
Firewall Packet Capture (Policy Capture and Inter- face Capture)	Supported	Not supported	Supported
AV Quarantine	Supported	Not supported	Supported
IPS Packet Cap- ture	Supported.	Not supported	Supported
DLP Archive	Supported	Not supported	Supported

Sandbox

DB & Results

FortiSandbox database and results are also stored on disk, but will not be affected by this feature.