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In the event of an MPIO path failover, Windows retries the ODX transfer. The storage array internally performs the copy or move and provides status information to the user. The token is delivered to the storage array. The token is copied between the source server and destination server. Windows automatically translates this transfer request into an ODX (if supported by the storage array), and it receives a token that represents the data. This procedure is described in the following steps:Ī user copies or moves a file by using Windows Explorer, a command line interface, or as part of a virtual machine migration. The following figure explains the steps that are involved with a token-based copy operation. As an example, when you copy a file or migrate a virtual machine between storage locations (within or between storage arrays), a token representing the virtual machine file is copied, thereby removing the need to copy the underlying data through the servers. The token serves as a point-in-time representation of the data. Instead of routing the data through the host, a small token is copied between the source server and destination server. To eliminate this inefficiency, ODX uses a token-based mechanism for reading and writing data within or between intelligent storage arrays. Written back to the storage through the destination server Transferred across the network to the destination server
Read from the storage through the source server In traditional host-based file transfers, the data to be transferred must be: Transfer large files such as database files or video files with increased speed and decreased CPU and network resource consumption on the host server Rapidly import and export Hyper-V virtual machines that are stored on an ODX-capable storage array and accessed via iSCSI, Fibre Channel, or SMB file shares Windows offloads file transfers transparently and automatically when you move or copy files, irrespective of whether you drag-and-drop files through File Explorer or use command-line file copy commands. Windows Offloaded Data Transfer (ODX) functionality in Windows maximizes an enterprise’s investment in intelligent storage arrays by enabling the arrays to directly transfer data within or between compatible storage devices, bypassing the host computer.īy offloading the file transfer to the storage array, ODX minimizes latencies, maximizes array throughput, and reduces resource usage such as CPU and network consumption on the host computer. ODX enables direct data transfers within or between compatible storage devices without transferring the data through the host computer. This topic provides an overview of Windows Offloaded Data Transfer (ODX, also known as copy offload) in Windows.
Applies To: Windows Server 2012 R2, Windows Server 2012