OnCommand Unified Manager fails to purge "unified-manager.xxxxxx" binlogs

Applies to

• OnCommand Unified Manager ( OCUM )
• ActiveIQ Unified Manager (AIQUM)
• All platforms

Issue

After upgrading Unified Manager, the available space in /data or your Windows install directory began to decrease abnormally fast over time. In the example below the /data filesystem is 93% used. 

diag@ocum:~$ df -TH
Filesystem               Type      Size  Used Avail Use% Mounted on
rootfs                   rootfs     64G   14G   47G  23% /
udev                     devtmpfs   11M     0   11M   0% /dev
tmpfs                    tmpfs     1.3G  173k  1.3G   1% /run
/dev/sda1                ext3       64G   14G   47G  23% /
tmpfs                    tmpfs     5.3M     0  5.3M   0% /run/lock
tmpfs                    tmpfs     5.2G     0  5.2G   0% /run/shm
/dev/sdd1                ext3       32G  123M   30G   1% /jail
/dev/mapper/data--vg-lv2 ext4      793G  698G   55G  93% /data

While attempting to upgrade Unified Manager one might run into the following message saying that there is not enough free space.
Example: Upgrading from Unified Manager 7.2P1 to Unified Manager 9.4.

Unable to perform operation due to available disk space limitations. Please add additional storage to this VM or contact technical support for assistance"

Note: There are other situations one might encounter this message.