Troubleshooting Tip: Unable to upload firmware on Controller due to less space on flash

[mkpotlapelli]

Description
This article describes how to clear space on the Controller.

Related link.
https://docs.fortinet.com/document/wireless-controller/8.5.2/fortiwlc-configuration-guide
Scope
For version 8.3.x, 8.4.X and 8.5.X.

Solution
SSH into the controller.
1) Check how much space is used or free on the Controller.

wlc(15)# sh file systems
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root               897363    465111    384375  55% /

2) Check whether any older or current firmware is available in the flash.

wlc(15)# sh flash
wlc(15) 7.0-8-0

If yes, delete older and current firmware.

wlc# delete flash: <code name from show flash output>
wlc# delete flash: 7.0-8-0

3) Check whether any diagnostics, kernel-diag, old backup files on the controller.

wlc(15)# dir
-rwxrwxrwx 1 root root  72120 Feb  3 16:13 backup8.4.5
-rwxrwxrwx 1 root root 10270366 Jul  1 16:31 xxxx-controller-diagnostics.xxxx-master.2020-07-01.16-30-36.tar.gz
-rwxrwxrwx 1 root root 10377790 Jul  1 17:55 xxxx-system-diagnostics.xxxx-master.2020-07-01.17-54-14.tar.gz

If yes, delete diagnostics, kernel-diag and old backup files.

wlc(15)# delete meru-controller-diagnostics.Meru-master.2020-07-01.16-30-36.tar.gz
wlc(15)# delete meru-system-diagnostics.Meru-master.2020-07-01.17-54-14.tar.gz
wlc(15)# delete backup8.4.5

4) Delete captures from Controller.

wlc(15)# cd capture
wlc(15)# dir
total 16
-rw------- 1 root root 16291 Sep 24 15:21 eth_00001_20200924152144.pcap
wlc(15)# delete eth_00001_20200924152144.pcap
wlc(15)# dir
total 0
wlc(15)#

5) Delete patches from controller.

wlc(15)# sh patch
8.5-2build-5-patch-BUGxxxxx-3006201131-i386
wlc(15)# delete flash: 8.5-2build-5-patch-BUGxxxxx-3006201131-i386
Deleting upgrade image images/meru-8.5-2build-5-patch-BUGxxxxx-3006201131-i386
wlc(15)# sh patch
wlc(15)# exit