VIRTUALIZATION AND RESOURCE MANAGEMENT in .NET framework

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Conditions
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It is possible for WSRM to switch to a different resource allocation policy when one of six precon gured events occurs These events are con gurable via the Conditions console tree item and the Add/Edit Conditional Policies action The conditions available are listed here, and each type can be used for speci c resource allocation policy application:
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Hot addition of a processor or processors Hot addition of memory (RAM) A cluster service node comes online A cluster service node goes of ine A cluster service resource group comes online A cluster service resource group goes of ine
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Accounting
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The nal component of WSRM is the Accounting module This module is disabled by default due to the resources used to capture the data, both in terms of overhead and disk space in the internal database The database used for the accounting information can be changed via the Set DB Server action To enable Accounting, run the Enable action; after activating, the Filter View action allows con guration of which information is displayed and over what time period You can archive captured data or delete through the Archive or Delete information action, as shown in Figure 1937 You also can select the computers for which data should be targeted, which can be archived or deleted via the relevant options After accounting data is captured, it can be viewed in the Details pane, which shows details of all processes on the system, along with detail on memory and CPU usage
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FIGURE 19-37 Con guring to delete or archive accounting information To modify the frequency of data collection, modify the server con guration, as discussed in the next section
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Server con guration can be exported via the Export WSRM Information action, which is available when the root of the console tree is selected The export creates a series of XML les containing information about policies and process-selection criteria, in addition to the calendar con guration This information can then be read into other WSRM servers or used to restore WSRM con guration in the event of a WSRM con guration corruption To reset WSRM con guration back to the default WSRM con guration, run the Reset WSRM Information action Additional con guration is available via the Properties action which opens up the server details The Management tab allows the state of WSRM to be set This also con gures the state of calendaring, if pro ling management is enabled, as well as the current resource allocation policy and the default calendar con guration (see Figure 19-38) The Exclusion list shows the processes that are not controlled by WSRM The user-de ned processes can be modi ed if required; however, the system-de ned list of processes cannot It is best practice to not modify the user-de ned list because they are key processes that are best not resource constrained Ideally, no aspect of the OS should be resource constrained via WSRM
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Windows System Resource Manager (WSRM)
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The Noti cation tab allows email noti cations to be sent to the con gured email alias This happens via the con gured SMTP server for the event logs enabled in the event log message list The Accounting tab allows the frequency of accounting information to be captured, which can be changed from the default of 10 minutes It is recommended not to set this value below two minutes because of the overhead it incurs on the system
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19 VIRTUALIZATION AND RESOURCE MANAGEMENT
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FIGURE 19-38 WSRM server properties
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If you need to disable WSRM, run the Stops WSRM management action
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Advantages of Virtualization and Consolidation
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Virtualization and consolidation are the way to go With today s more powerful hardware and new capabilities for virtualizing services and better controlling resource allocation, the days of one physical server per role are history In ve years, I doubt there will be any servers offering services that run directly on hardware The exibility provided by a VM and the better use of hardware make running on dedicated hardware a hard sell Consolidation via virtualization or resource management reduces costs in hardware and costs in power usage, and also reduces physical space, which leads to other cost savings If you use resource management via WSRM, you also reduce the number of OS instances; this further cuts down not only on licensing costs but on the number of OSs that need managing, patching, and backing up This leads to even further cost savings And by consolidating, you have more resources available to processes because consolidated services typically run on more powerful hardware Now is a great time to look at virtualizing servers and consolidating However, you should always ensure the services you virtualize are supported in a virtual environment by the vendor, or you might have supportability issues
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Summary
Virtualization is the future Today, only 6% of servers are virtualized, leaving a huge amount to do I would be surprised if, in ve years, that number was not 50% If you consider that 90% of servers run at less than 10% utilization, along with the money spent on new hardware, not virtualizing is insane A common stumbling block has been application support when running under a virtual, but you can expect more and more services to be supported the same way under a virtual as on physical hardware You can nally be rid of best efforts from vendors In some cases, you have different options for the level of virtualization For example, Virtual Desktop Infrastructure (VDI) is when a virtual server (or many virtual servers) run VMs, which then run a client OS, such as XP or Vista Users connect to one of these VMs, giving them their own VM
Summary
environment in which they perform all their duties Because the OSs are running on virtual servers, they can easily be destroyed and recreated; this prevents the need to x problem environments, because it s faster to just recreate On the user desktop side, the user would run a thin client, or perhaps legacy hardware running Windows fundamentals, as the remote desktop client or even a Linux shell Why is VDI even needed We already have terminal services, which allow users to remote connect to their own session The fundamental difference between VDI and a session on a terminal server is isolation With a terminal server session, you are running processes and software on a shared OS; with VDI, you are the only session on that OS, so you have greater isolation Ultimately, the right solution depends on your environment Terminal services is very ef cient, because you have to patch only the terminal servers With VDI, you have to patch every VM, which is a lot, but VDI does have better isolation The best solution might be a combination of both, depending on speci c client needs Many people raise concerns over the performance and stability of Hyper-V after all, it s new There are few comparisons of performance between Hyper-V and the leading alternatives This is mostly due to the fact that Hyper-V s competition have strict verbiage in the end-user agreements regarding what can be published (in terms of performance) without their permission Unof cially, however, I ve seen Hyper-V beating the competition in 90% of tests, so you don t need to worry about performance; more on this will be seen at release time In terms of stability, many Microsoft clients have been using Hyper-V since beta with no problems Microsoft itself runs MSDN exclusively on Hyper-V since release candidate 0 Everything discussed in this chapter regarding server virtualization or consolidation via WSRM is favorable in terms of being green In 2008 and beyond, this is a big deal we are running fewer servers, taking up less rack space, and better utilizing the resources we have This is great for the environment, but also gives us more bang for the buck In the future, we will see everything virtualized: OSs, applications, and services I hope this chapter has given you a solid understanding of how the technologies work