A V A I L A B I L I T Y in VS .NET

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A V A I L A B I L I T Y
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Replication Failovers Services and Applications Client Management Local Environment Networking Disk and Volume Management Reliable Backups Good System Administration Practices INVESTMENT
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Figure 19.1 Level 9 of the Availability Index.
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In this brief chapter, we look at three abstraction levels for machines:
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II II
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Systems divided into independent partitions Multiple virtual copies of the operating system within a single virtual (or real) system Scheduling of resources within a single system to control predictability and ensure service level agreements
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This chapter isn t meant to be a full tutorial in the configuration aspects of each topic. Rather, we want to relate the issues of resource management to making systems predictable. Going back to our definition of availability as making sure users can get their jobs done, virtualization of machine resources and allocation of those resources to tasks aids in availability planning by offering the ability to cap user-visible latency.
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Partitions and Domains: System-Level VMs
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Whether you call them domains, partitions, or logical partitions (LPARs in mainframe parlance), the first level of VM abstraction is to subdivide a large server into several smaller virtual servers. There s no hardware effect in this subdivision; it s all done via software that reroutes the logical connections of the backplane. This soft cabling allocates hardware system resources to create multiple, independent machine instances. Each domain or partition runs its own copy of the operating system, can be booted or crash independently,
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Virtual Machines and Resource Management
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and has its own complete view of the network, IP addresses, memory, CPU, scheduling, and all other functions controlled by the OS. One of the advantages of domains is that you can shuffle resources between them, in many cases while the system is running. Have a large workload that needs another four processors Borrow them from the QA domain, run the job to completion, then put the processors back into the degraded QA domain for normal operation. Dynamic reconfiguration of hardware involves draining CPU and memory boards of data, then detaching and reattaching them to appropriate domains. This hardware-level VM capability is frequently controlled by a console or command-line function available to a privileged user only. VMs can be created, destroyed, and reallocated very quickly and easily under software control. One of the most common uses for software VMs (such as VMware, www.vmware.com) is to allow a user to run more than one operating system on a PC or workstation. Once the host software has been installed on the physical system, it can be used to create new virtual machines, each one of which could run a different operating system. A sophisticated user or administrator could choose to run Windows XP, Windows 2000, Windows NT, Solaris for Intel, Red Hat Linux, and SuSe Linux at the same time on six virtual machines on the same Intel-based computer. As with any technology that touches system resources, there are good and bad aspects of partitions and domains in the reliability engineering world: Good. Running multiple environments on the same box. Separate environments for each stage of the deployment lifecycle were highlighted in 5, 20 Key High Availability Design Principles (Rule #9). To many managers, that means separate boxes with increased footprint, increased physical management woes, and more cost. Combining environments in the same physical server, using partitions to slice it into production, QA, and development environments, gives you a lifecycle in a box. They re isolated, as if they were on separate servers, but with the advantage of running inside a single box. Bad. When the big box fails, so do all of the partitions. As we observed way back in 2, What to Measure, hardware is a relatively rare cause of system downtime; system problems are usually software related. But when the partitioned box fails, all of its partitions fail with it unless the failure can be constrained to a single domain of resources that is logically isolated from other domains. Neutral. You can failover from one domain to another one. By failing over from one virtual machine to another inside the same physical computer, you can recover from non-hardware system failures without having to incur the expense of additional hardware.
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