With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
fsUsage
fs Usage
This attribute describes the percentage of the free space available on the filesystem.
Back to Nortel-Magellan-Passport-FileSystemMIB MIB page.
IPHost Network monitor allows you to monitor fsUsage on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel speech servers right now.