With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
fsActiveDisk
fs Active Disk
The activeDisk attribute value is the Disk component instance value of the active disk. This is also the card number of the active control processor.
Back to Nortel-Magellan-Passport-FileSystemMIB MIB page.
IPHost Network monitor allows you to monitor fsActiveDisk 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.