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If such a determination is made, action is taken to power cycle the node, which can be done with network power switches for example STONITH is a sound approach to fencing, because it is built on the notion that healthy nodes monitor and fence unhealthy nodes This differs significantly from the fencing model implemented in Oracle Clusterware, which does not implement STONITH at all In Oracle Clusterware, nodes fence themselves by executing the reboot (8) command out of /etc/in i t d/in i t cssd This is a very portable approach to fencing, but it raises the question What happens if the node is so unhealthy that it cannot successfully execute the reboot (8) command You may have encountered systems that were so despondent that commands no longer executed (eg, complete virtual memory depletion).

In a cluster, it is imperative that nodes get fenced when they should; otherwise, they can corrupt data After all, there is a reason the node is being fenced Having a node with active I/O paths to shared storage after it is supposed to be fenced from the cluster is potentially dangerous In those rare cases where Oracle's fencing mechanism is not able to perform its fencing operation, the underlying host clusterware will fence the node, as is the case with PolyServe Matrix Server The criteria used by Oracle Clusterware to trigger fencing are the same criteria host clusterware use to take action Oracle instituted the Clusterware Compatibility Test program to ensure that underlying clusterware is compatible with, and complimentary to, Oracle Clusterware STONITH is one form of fencing but far from the only one.

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PolyServe supports a form of STONITH in which the healthy nodes integrate with management interfaces, such as the HP Integrated LightsOut (iLO) or Dell Remote Assistant Card (DRAC) Here again, the most important principle of clustering is implemented healthy nodes take action to fence unhealthy nodes, which ensures the fencing will, in fact, occur This form of STONITH is more sophisticated than the network powerswitch approach, but in the end, they do the same thing both approaches power cycle unhealthy nodes..

All the mobile applications have configurable parameters, but they all have sensible defaults. To access the applications, users connect to the configured access points using whatever device they wish. Following authentication, Mobile Collaboration will respond with a menu generated into whatever user interface is appropriate to the device. It is possible to test the mobile applications without using a mobile device. Clicking the Test icon for an application (shown in Figure 11-9) will launch a wireless PDA simulator, shown in Figure 11-10. The simulator can be used to confirm the applications functionality, both for using the applications and for receiving notifications.

In this chapter, you looked at the main features and techniques for language-oriented programming in F#. You have seen various techniques; some use data structures as little languages or work with quotations, which involve working with the existing F# syntax to change or extend it. Others, such as implementing a parser, enable you to work with just about any language that is text-based, whether this language is of your own design (or perhaps more commonly) a preexisting language. All these techniques can lead to big productivity gains if you use them correctly. The next chapter will look at how to parse text using F#. This will allow you to create languages that are not embedded within F#, yet will allow you to work with the main text-based formats that are defined.

It is not always desirable to have an unhealthy server power cycled just for the sake of fencing, as there could be helpful state information available before the power reset Losing that information may make cluster troubleshooting quite difficult Also, if the condition that triggered the fencing persists across reboots, a reboot loop can occur For this reason, PolyServe implements fabric fencing as an option for customers running RAC Fabric fencing is built on the PolyServe SAN management layer PolyServe certifies a comprehensive list of Fibre Channel switches that are tested with the fabric-fencing code All nodes in a PolyServe cluster have LAN connectivity to the Fibre Channel switch.

With fabric fencing, healthy nodes make SNMP calls to the Fibre Channel switch to disable all SAN access from unhealthy nodes, so this form of fencing is built on the sound principle of having healthy servers fence unhealthy servers, leaving the fenced servers in an up state, but completely severed from shared disk access Administrators can log in to the fenced server, view logs, and so on, but before the node can rejoin the cluster, it must be rebooted The most important aspect of host clusterware is that it is generally implemented in kernel mode In the case of PolyServe, all aspects of SAN management, CFS, volume management, and so on are implemented in kernel mode When fencing code is implemented in user mode, there is always the risk that the code will not get processor cycles to execute.

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