With IPHost Network Monitor you can run simple snmp requests against a HP device in your network.
file-system-statistic-current-memory-usage
file-system-statistic-current-memory-usage
1.3.6.1.4.1.11.2.3.9.4.2.1.1.10.2.5
A value indicating the number of bytes of RAM currently used by the file system firmware. Additional information: Reset to the factory default value after a power cycle. Returns status if attempting to access this object and there is no storage device is installed. This will veri depending on the number and size of Mass Storage devices installed.
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IPHost Network monitor allows you to monitor file-system-statistic-current-memory-usage on Hewlett Packard device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.