Technical Tip: How to extend the disk space for log in FortiGate VM Model
Description
This article describes how to extend the disk space for the log in FortiGate VM Model.
Scope
FortiGate.
Solution
For FortiGate VM model in FortiOS version 5.6.x, log share disk with both wanopt and webcache.
From the screenshots below, it is possible to see that the disk space for the log is only about 20% for the full disk.
Iriz-kvm19 #get hardware status
Iriz-kvm19 #get system status
Similarly, the disk usage can be checked on the FortiGate UI.
By default, WanOpt and WebCache will occupy about 80-85% of the disk space.
In order to extend the disk space for log, it is necessary to change the disk size of wanopt and webcace. The minimum hardcoded size that must be assigned to WanOpt is 512MB.
To reduce the disk size of WanOpt:
Iriz-kvm19 # config wanopt storage
Iriz-kvm19 (storage) # edit Virtual-Disk
Iriz-kvm19 (Virtual-Disk) # set size 512
Iriz-kvm19 (Virtual-Disk) # end
To verify:
Iriz-kvm19 # get wanopt storage
== [ Virtual-Disk ]
name: Virtual-Disk size: 512 webcache-storage-percentage: 0
Lastly, perform a reboot on the FortiGate unit. After the reboot, it is possible to observe that the disk size for the log has increased.
Note:
The only officially supported way to extend the log disk is by redeploying the VM with a larger disk size or assigning a larger virtual disk size can be assigned to the VM, but it is needed to format the log disk.
execute formatlogdisk
Any other methods used to extend the log disk and issues caused as a consequence will not be supported by the Fortinet Support team. Refer to the article for more information: Technical Tip: Extend log disk FortiGate-VM running on VM ESXi.