Storing files in a scaled-out fashion is a pain in the NAS in C#

Generator Code128 in C# Storing files in a scaled-out fashion is a pain in the NAS

Storing files in a scaled-out fashion is a pain in the NAS
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Sticky sessions
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A sticky session occurs when a load balancer forwards all incoming requests from the same client to the same server for the period of the session.
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NETWORK-ATTACHED STORAGE (NAS)
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A network-attached storage device is a disk array that you can plug into your network and that can be accessed via a network share. NAS devices are responsible for managing the device hardware, the filesystem, and serving files, and can provide varying levels of redundancy, depending on the device and the number of disks in the array. Although NAS devices reduce load from client operating systems by taking responsibility for file management, they can t scale beyond their own hardware. NAS devices can range from being pretty cheap to very expensive, depending on the levels of scalability, performance, and redundancy that you require from the device. In figure 8.1, the NAS device would be represented by the storage block (connected via the Ethernet). NAS devices are used to provide capabilities similar to those of a file server, rather than being used as a disk management system in a high-performance application solution.
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A direct-attached storage device is a disk array that you can plug directly into the back of your server and that can be accessed natively by the server. DAS devices are responsible for managing the device hardware and can provide varying levels of redundancy, depending on the device and the number of disks in the array. Because DAS devices are directly connected to a server, they re treated like a local disk; the server is responsible for the management of the filesystem. DAS devices can support large amounts of data (100 TB or so), can be clustered (there s no single point of failure), and are usually high-performance systems. As such, DAS devices are a common choice for high-performance applications. The cost of the device can range from being pretty cheap to very expensive, depending on the levels of scalability, performance, and redundancy that you require. Although DAS devices are great, they re limited by the physical hardware. When you reach the physical limits of the hardware (which is quite substantial), you ll be able to scale no further. In figure 8.1 the DAS device would be represented by the storage block, connected directly to the servers.
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STORAGE AREA NETWORK (SAN)
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Like DAS devices, SANs are also separate hardware disk arrays; they don t have their own operating system, so file management is performed by the client operating system. SAN devices are represented on the client operating system as virtual local hard disks that are accessed over a fiber channel. Because you need your web servers to
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The basics of BLOBs
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access shared data, the SAN would need to support a shared filesystem. In figure 8.1, the SAN device would be the storage block, attached to the web servers via fiber channels. SANs are usually quite expensive, require specialized knowledge, and are rarely used outside the enterprise domain. To give you a clue about how expensive they are, Dell doesn t even list the price on its website. As for installing and managing SANs, that s purely in the domain of the long-haired sandal-wearing bearded types. We mere mortals have no chance of making those things work. SAN devices support replication and are highly scalable (they scale much higher than do DAS devices), fault tolerant, high performing, and incredibly expensive. Due to their performance, price, and scalability, this is the solution of choice in the enterprise space. The rest of us can only dream. Hopefully we ve justified our earlier premise that implementing a file storage solution today isn t as easy as it first looks. All the available choices (beyond a certain size) require extensive IT knowledge, skills, and management, not to mention large amounts of cash or a tradeoff between capacity, redundancy, ability to scale, or performance. This is the state of affairs with regard to the issues with storing files in traditional on-premises solutions. Let s now look at the Windows Azure BLOB storage service and how it tackles these issues.
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