Sharing Data in .NET framework

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Since there are many hosts connected to many storage devices in a SAN, the question invariably arises: Can we share data between the different hosts on the SAN The answer is a very qualified yes. The fundamental problem with two systems accessing the piece of data on the same disk at the same time is that standard operating systems and disk management software do not know how to arbitrate between these parallel requests, particularly if one of those requests is a write. The most benign outcome of such a conflict is probably a system crash from one or more of the hosts. Data corruption, potentially large-scale, is another potential, and far more serious, outcome.
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There are SAN-based software packages available, often called clustered filesystems and volume managers, that permit multiple systems to have parallel access to shared data. The limitation of these packages is that they do not permit data sharing between systems running different operating systems. We expect this limitation to be overcome during the next few years. A simpler application of shared storage is the migration of the right to access a set of disks from one system to another. In this case, huntley gracefully gives up its access to one set of disks, and they are passed to a second system, brinkley. This is precisely what happens in a clustered failover, which we will discuss in more detail in 15, Local Clustering and Failover. This passing of data and disks from one system to another also occurs manually when an older huntley is being retired and replaced by a newer and faster brinkley, or when data and systems are being migrated from one data center to another on the same SAN.
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In the mid-1950s, when the United States started to build the Interstate Highway System, a new network of high-speed, high-capacity highways was added to the existing infrastructure of smaller roads around the country. The result, of course, was a lessening of traffic on the smaller roads, as cars took to the newer and faster roads. But since the roads could support more cars, people bought more cars, keeping the roads quite busy. (So that s why the Interstate near your house is always under construction.) As a new network of SANs is added to data centers and enterprises that previously had just LANs, the result is a significant increase in the amount of data that can be moved, as well as in the speed at which that data is moved. Of course, since SANs are bigger and faster, organizations implement new applications that take advantage of the new bandwidth, keeping the networks quite busy. One of the biggest performance improvements that SANs have enabled is in backups. In many organizations, the single biggest load on LANs comes from backups. By moving backups from LANs to faster SANs, the results are less congested LANs and faster backups.
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With the introduction of SAN-aware tape drives and libraries, not only have the management costs of backups been reduced, but so have the hardware costs. With SANs, it is no longer necessary to purchase separate tape drives for each large data server. Instead, with proper backup software pushing the data, tape drives can be connected to the SAN and shared among the SAN-connected hosts, which are usually large data servers. The result is a significant reduction
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in the number of tape drives and libraries that are required for backups, saving the enterprise considerable amounts of capital. A new technique has been developed specifically for SANs that can speed up backups even more. This technique, third-party copy, uses specialized hardware called data movers to copy data from disk storage to tape, without all of the network overhead that standard backup methods bring along. The result is backups that run even faster, and with less of an impact on hosting servers. Data movers are available from companies like Chaparral Network Storage and Crossroads Systems. Generally, SANs are faster than LANs, and so backups that send their data across the LAN will be faster and more efficient that those that use a LAN.
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