![]() ![]() What Is Raw Device Mapping In Vmware?Ī raw device mapping is a special file that allows a virtual machine to access a physical storage device, such as a hard drive or a CD-ROM drive, that is attached to the host computer. This virtual disk format has the vmdk extension of files, and both VirtualBox and VMware use it to run virtual machines. ![]() The open format is known as the VMware VMDK file format, which is the virtual machine disk format developed by VMware. In general, it is a good idea to use raw device mapping for disks that will be used for storage of critical data, or for disks that are likely to see heavy use. Whether or not to use raw device mapping is a decision that must be made on a case-by-case basis. Disadvantages of raw device mapping include the potential for data loss if the storage system fails, and the need for special configuration of the storage system. It can also provide better security, because the data is not stored on the host file system where it could be accessed by unauthorized users. It can improve performance, because the virtual machine does not have to contend with the overhead of the host file system. Raw device mapping has several advantages. Instead, they are stored as files on a SAN, iSCSI target, or other storage system, and are accessed by the virtual machine as if they were physical disks. Both types of disks can be “raw device mapped.” This means that they are not stored as files on a virtual machine’s host file system. Monolithic disks are a single file, while growable disks start out as a small file and grow larger as more data is written to them. The file can be in either of two formats: monolithic or growable. A virtual machine disk (VMDK) is a file that represents a physical disk in a virtual machine. ![]()
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