From a pure OBM standpoint, dial-in access is supported by most SCS systems, but almost all modern SCSs use standard network connections as their primary method of communication to support a richer management environment, so access to SCSs is dependent on the status of your network. Depending on the required uptime of your systems, the possibility of creating a separate high-availability network for OBM should be explored--or, you should at least make provisions for remote telephone access to critical network equipment
Intelligent Remote Power Management
Remote power cycling is perhaps one of the easiest and least expensive options available for OBM. Although this service is also available as a capability in many embedded switch- and server- management solutions, in many cases this function is managed through an Ethernet connection and, therefore, is out of reach if the network becomes inaccessible or if the device loses power. The most basic OBM solution--a remotely manageable, switching PDU--can be employed to report system power status and, if necessary, cycle the power on an unresponsive device.
Switched PDU modules are available from a wide variety of vendors and can be configured to support almost any conceivable combination of outlet, voltage and electrical load requirements. Although the features vary by vendor, these systems monitor incoming and output power status, and offer the ability to remotely cycle the power to specific devices. Many systems offer a Web browser interface for a detailed graphical display of system status, and some provide more advanced features like a sequenced power-up routine to restart firewalls, routers and switches in the appropriate order.
This type of power cycling is not the optimal solution for dealing with servers--when compared to a clean reboot--but it will do in a pinch. And though a fancy Web interface is all well and good, for more basic OBM capabilities there's still nothing like a simple modem and a dumb terminal to ensure connectivity through thick and thin. We know, the mere thought of dusting off your ancient USR Courier sends chills up your spine, but sometimes the most low-tech answer is the best.
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