They also allow you to deliver guest clustering using

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expensive SAN solutions for the shared storage used by the guest cluster. They also allow you to deliver guest clustering using exactly the same infrastructure you use to deliver standalone virtual machines. In other words, you don’t need to have specialized storage such as an iSCSI or Fibre Channel SAN or a Windows Server system with the Microsoft iSCSI Target Software installed in order to implement guest clustering. FIGURE 4-4 Guest clusters using shared virtual disks can use either CSV disks for block storage or SoFS for file storage.
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Guest clustering using shared virtual disks CHAPTER 4 69 Using shared virtual disks Implementing guest clustering using shared virtual disks on Windows Server 2012 R2 is easy: 1. Create a new VHDX file on the volume you will use for shared storage for the cluster. 2. Open the Settings dialog for a virtual machine in Hyper-V Manager. 3. Click the SCSI Controller option under the Hardware category, select Hard Drive, and click Add to add a new hard drive to the controller. 4. Browse to select the VDHX file you created earlier, and then expand the new hard drive under the SCSI Controller to expose the Advanced Features option. 5. Click the Advanced Features option and select the Enable Virtual Hard Disk Sharing check box as shown in Figure 4-5, and then click OK (or Apply) to apply all the changes. 6. Repeat steps 2 through 5 of the above procedure for each virtual machine in the guest cluster. FIGURE 4-5 Use these settings to share a virtual hard disk.
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70 CHAPTER 4 Failover Clustering A few things to consider: The shared virtual disk must be a data disk; guest operating system disks cannot be shared. The shared virtual disk must use the newer VHDX format; it cannot use the older VHD format. The shared virtual disk must be attached to the virtual machine’s SCSI controller; it cannot be attached to the IDE controller. When performing the above procedure, don’t click Apply until you have selected the Enable Virtual Hard Disk Sharing check box. If you do this, you will have to remove the disk from the controller and reselect it in order to share it. Of course, all this can be done using Windows PowerShell as well. CSV and SoFS enhancements At the end of Chapter 3, “Storage,” we mentioned that enhancements to CSV in Failover Clustering now result in a more highly optimized rebalancing of how the SoFS feature works, but that since this related to the topic of clustering we’d defer discussing it until this present chapter. This is a fairly significant improvement for SoFS, so let’s look at it now together with some other improvements in how CSV works in Windows Server 2012 R2. Failover Clustering and SoFS Recall that SoFS is a feature introduced in Windows Server 2012 that allows you to use the Failover Clustering feature to deploy active-active clusters of file servers that can store server application data, such as Hyper-V virtual machine files or SQL Server database files, using file shares instead of using LUNs on a SAN. The key of course is that a SoFS allows you to
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