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When a client device requests to write a fi le, EFS instructs the client to break the fi le into a number of data blocks, to calculate the parity data associated with those blocks, and to write the data blocks and parity, in parallel, to all of the storage nodes of the system. Thus, the designation of the EFS as a parallel fi le system. A key performance benefi t is the fact that when distributed in this manner, the resulting bandwidth of the write operation is the sum of the bandwidth available from all the storage elements (i.e. all disk drives) in the system. The number of data blocks is determined by the XOR confi guration of the storage system. The system illustrated in Figure 1 has an XOR 2 confi guration; data blocks will be written to 2 of the nodes and the associated parity will be written to the remaining node. In the general case, the EFS always reserves one node for parity. Thus, an EFS system will have an XOR (nodes -1) confi guration. There is no limit to the number of storage nodes in an XStream EFS Shared Storage System. Reading Stored Data When a client device requests to read a fi le from storage, it, again, communicates with EFS and is given the information it needs to locate the stored data associated with the requested fi le. The client retrieves those blocks and reassembles the fi le for use in the client application. This type of fi le system is designed for media production environments where multiple editors share project spaces and media assets. Typically, each editor uses an NLE UNTIE YOUR TALENT How can you demonstrate your creativity if your equipment holds you back? The new CW-F25 Wireless HD Video System from IDX frees you from the restrictions of cable and provides the flexibility you need to get the best shots back to base. Dynamic Frequency Selection (DFS) automatically chooses the best available channel and Beam-forming technology maintains directional signal integrity. This unique combination means that no other wireless system using WiFi channels delivers greater reliability. And because it releases camera operators from more expensive systems using licensed channels or cables, it’s cost-effective too. You also get return video, talkback, tally and camera control and an Ethernet bridge over the wireless link. To find out more or arrange a demonstration go to Reliability and safety first KITPLUS - THE TV-BAY MAGAZINE: ISSUE 102 JUNE 2015 | 49