With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
fsDiskUnformattedCapacity
fs Disk Unformatted Capacity
unformattedCapacity This attribute indicates the physical disk size (in bytes). The physical disk size may be different from the formatted disk size if there are bad blocks or the disk has been formatted to a smaller disk size for backward compatibility with older releases.
Back to Nortel-Magellan-Passport-FileSystemMIB MIB page.
IPHost Network monitor allows you to monitor fsDiskUnformattedCapacity 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 multiplexers right now.
