Individual HDD usage monitoring

Hi,

I have a client who is interested in using OpManager to manage some servers and firewalls.

One of his requirements is that he can see (and receive notifications for) the utilization of individual HDDs within his server. Does OpManager support this or does it only display total HDD utilization. He requires this feature so he can be notified when a single disk in a server is nearly full.

Also, he has a couple of cheap firewalls running VPNs between sites. I don't believe these support SNMP. Is it possible to do any monitoring on them and if so to what extent?

If he were to replace these devices with ones that support SNMP, how much more detail could we get (regarding the VPN link itself)?

Thanks.