With IPHost Network Monitor you can run simple snmp requests against a F5 Network device in your network.
hostDiskSpace
host Disk Space
1.3.6.1.4.1.3375.1.2.1.1.4.1.1.15
The amount of available disk space for / in kilobytes. If this statistic is not available it will have a value of -1.
Back to F5-3DNS-MIB MIB page.
IPHost Network monitor allows you to monitor hostDiskSpace on F5 Network device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring F5 Network switches right now.