A virtual disk is a file or a set of files on the host system that appears as a physical disk drive to the guest operating system. Virtual hard disk files store information such as the operating system, program files, and data files and have a. The New Virtual Machine wizard creates a virtual machine with a single disk drive. To ensure target device reliability in a high demand workload, Citrix recommends that local disk free space is larger than vDisk capacity size. It waits for more local disk free space to become available.
This condition has a negative impact on the workload continuity. Citrix recommends allocating enough local disk free space. The amount of RAM specified does not change the local disk free space requirement. Write cache can exist as a temporary file on a provisioning server. For extra security, the server can be configured to encrypt write cache files. Since the write-cache file does exist on the hard drive between reboots, the data is encrypted in the event a hard drive is stolen.
This cache option allows for the saving of changes between reboots. Using this option, after rebooting, a target device is able to retrieve changes made from previous sessions that differ from the read only vDisk image. If a vDisk is set to Cache on server persistent , each target device that accesses the vDisk automatically has a device-specific, writable disk file created. Any changes made to the vDisk image are written to that file, which is not automatically deleted upon shutdown. A target device can be assigned to multiple vDisks and therefore have multiple cache files associated to it.
To restore a vDisk that uses Cache Persistent on Server , be sure to back up all vDisk files and associated user cache files before making changes. Cache files that are marked as invalid are not deleted. Periodically, these files are manually deleted. Consider the impact of using a server-side persistent write cache. Persistent cache is only used where unauthorized users have access to a machine. Ensure that machines are not shared among users.
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Citrix will not be held responsible for any damage or issues that may arise from using machine-translated content. The following provides an overview of the steps necessary to create a vDisk automatically and manually. The master target device, physical or virtual, is prepared by installing and configuring the operating system.
Also, configure applications in the base vDisk image. For details, see Preparing the Master Target Device. To image the master target device, run the Imaging Wizard to automatically create a vDisk file on a server or shared storage. After running the Wizard, image the master target device to that file. In the Citrix Provisioning console, a new vDisk file can be created by right-clicking on the vDisk Pool or the Store , and then selecting the Create new vDisk menu option.
The imaging utility converts a server or desktop workload from an online physical machine running Windows to a XenServer virtual machine or provisioned vDisk. The imaging utility converts a server or desktop workload from an offline virtual machine or disk, containing any guest operating system, to a XenServer VM. A vDisk image cannot be assigned to, or boot from a target device until that target device exists in the Citrix Provisioning database. After creating the target device, in the Console , select the Hard Disk boot option.
The Common Image feature allows a single vDisk to simultaneously support multiple target device platforms, greatly reducing the number of vDisks an administrator must maintain.
The procedure for creating a common image depends on the target device platform. XenServer Platinum Edition enables the provisioning of physical and virtual servers from the same workload image. To create a common image that boots from a physical or virtual machine, complete the procedures as follows. Install a supported Windows Operating System with the latest patches and device drivers on a physical machine. This physical machine serves as the master target device.
Download XenConvert software and installation instructions from either the Citrix Provisioning product download site or the XenServer product download site.
When creating the vDisk image, you must select to optimize target device settings. Otherwise the VM fails to boot.
After successfully creating the XenServer vDisk image, boot both the physical and virtual machines in standard image mode. To create a common image using the common hard drive method that boots from heterogeneous Blade servers, complete the following steps:.
Using the common NIC method, a single vDisk can simultaneously support different motherboards, network cards, video cards, and other hardware devices. The result is a vDisk capable of being used by heterogeneous target devices, greatly reducing the number an administrator must maintain. Use the information in this article to create a common image for physical devices. Make sure all target devices using the common image have a consistent HAL; they must have the same number of logical processors.
A single processor, hyper-threading capable system is considered to have two logical processors when hyper-threading is enabled in the BIOS. When building the common image, create a vDisk that has enough space to accommodate additional information added by the common image build process.
Insert the common NIC into a target device added to the common image, then boot the target device from its local hard drive. Although the Windows OS must be installed on this target device, the target device software does not have to be installed. At a command prompt, navigate to the directory in where CIM. Run the following command to extract the information from the target device into the. For example, TargetDevice1. To include more target devices with disparate hardware in the common image, repeat this procedure for each device, giving each.
Copy the CIM. Physical disk in teradata can be called as RAID array of disks, where your data is stored physically i. Teradata Virtual Storage pools all of the cylinders within a clique's disk space and allocates cylinders from this storage pool to individual AMPs. Disk Arrays A disk array is a matrix of independent but interconnected physical disk storage units. Each array typically consists of from one to four ranks of disks, with up to five disks per rank.
A drive group is a set of drives that have been configured into one or more logical units LUNs.
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