code 128 font c# Running SQL Server on Hyper-V in C#

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Running SQL Server on Hyper-V
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Figure 2 A virtual machine running on Virtual Server 2005 R2 passes its operating system calls to the host operating system for execution, which results in a longer, slower path to the hardware.
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Server software virtualization products such as Microsoft Virtual Server 2005 R2 SP1, as shown in figure 2, incur more overhead than hypervisors and are slower. Virtual Server 2005 R2 SP1 is installed as an application running on the physical machine s operating system. Virtual operating systems are installed into Virtual Server 2005 R2 SP1. The virtual operating system must pass all of its hardware calls to the virtualization application, which in turns passes them to the host operating system. For example, if Windows 2003 Server is installed as a guest operating system in Virtual Server 2005 R2 SP1, which is installed on Windows Server 2008, operating system calls in 2003 Server are passed through Virtual Server 2005 SP1 to Windows Server 2008 to finally be executed. The path is less direct than that of a hypervisor and this adversely impacts performance. Even with the inherent overhead of software virtualization, small volume SQL Servers with limited demands on the hardware can perform acceptably using server software virtualization such as Virtual Server 2005 R2. For more demanding database applications, hypervisor-based server hardware virtualization is needed. Hyper-V offers significantly improved disk I/O performance when compared to Microsoft Virtual Server 2005 R2.
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When a virtual machine crashes, it doesn t affect the other virtual machines or the physical machine because each virtual machine is isolated from the others and the physical machine. Processes in one virtual machine (VM) can t read, corrupt, or access processes running in other virtual machines. Because of this complete isolation, it is possible to have multiple default instances of SQL Server running on a single physical server by having each default instance in its own virtual machine. This is particularly important when trying to consolidate third-party applications which require default instances of SQL Server. Each application can run in its own virtual machine with each virtual machine running a default instance of SQL Server.
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Configuring virtual machines
To obtain the best possible results from a virtual machine, it must be configured properly. Configuration of virtual disks, virtual processors, and virtual network adapters affect performance.
Configuring disks
Microsoft Hyper-V offers the following choices for its virtual disks: Passthrough disks Virtual hard disks (VHDs) Dynamically expanding Fixed size Differencing Passthrough disks are physical disks directly accessed by the virtual machine. Because they offer the most direct path, they provide the best performance and are well suited for large data volumes. They lack flexibility and portability. A virtual hard disk is a file that resides on the parent partition s file system or storage area network (SAN). Dynamically expanding VHDs are best suited for development and test environments because they conserve disk space. Dynamically expanding VHDs grow as needed, which minimizes space usage but tends to cause fragmentation. Because the virtual machine s operating system is isolated from the physical machine, it has no knowledge of the amount of physical disk space available. The virtual machine only knows the maximum allowable size of the dynamic VHD. This can create a disparity between what the virtual machine sees as free space and the reality of free space on the physical machine. In figure 3, the virtual machine running in the window on the right shows 117 GB of free space in its VHD. But because this dynamically expanding VHD resides on physical disk D, which has no free space left, the 117 GB of free space doesn t actually exist. Hyper-V places the virtual machine into a paused state because it has no physical space to continue operating. SQL Server can be configured to provide you with low free disk space alerts, but if you are using dynamically expanding VHDs, you may not get the alert. The virtual machine doesn t know when there isn t room for a dynamically expanding disk to grow. Fixed-size VHDs perform better than dynamically expanding VHDs because all of their space is preallocated, although the performance difference has been lessened with the R2 release of Hyper-V. When a fixed VHD is created and its size specified, it takes all of its space from the physical machine. If there isn t enough space, an error occurs and it is not created. Differencing VHDs also grow as needed, but they are linked to another VHD in a parent- child relationship. When a differencing VHD is used, all changes are written to the differencing VHD instead of the parent VHD. Although this causes an overall slight decrease in disk performance, it allows changes to be made without altering the
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