12-10-2017, 11:25 PM
Mail me a notes of San plz. My mail I'd is phaniajay.gv[at]gmail.com
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rnsit san notes
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Mail me a notes of San plz. My mail I'd is phaniajay.gv[at]gmail.com
12-10-2017, 11:26 PM
San notes plz.i need it for references and for my exam and internals
12-10-2017, 11:27 PM
I need the San notes. My mail I'd is phaniajay.gv[at]gmail.com .plz forward me notes sir
19-10-2017, 09:19 AM
A storage area network (SAN) is a network that provides access to consolidated block-level data storage. SANs are primarily used to enhance storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices are displayed to the operating system as locally connected devices. A SAN usually has its own network of storage devices that are generally not accessible through the local area network (LAN) by other devices. The cost and complexity of SANs declined in the early 2000s to levels that allow for wider adoption in business environments and small- and medium-scale commercial environments.
A SAN does not provide file abstraction, only block-level operations. However, SAN-based file systems provide file-level access and are known as shared disk file systems. Historically, data centers first created "islands" of SCSI disk arrays as direct-attached storage (DAS), each dedicated to an application, often visible as a number of "virtual hard disks" addressed as Logical Unit Numbers (MON). Essentially, a SAN consolidates such storage islands together using a high-speed network.
Operating systems keep their own file systems on their own dedicated and unshared LUNs, as if they were local to themselves. If multiple systems were simply to try to share a LUN, they would interfere with each other and corrupt the data quickly. Any planned interchange of data on different computers within a LUN requires software, such as SAN file systems or clustered computing.
Despite these issues, SANs help increase storage utilization, as multiple servers consolidate their private storage space into disk arrays. Common uses of a SAN include provisioning of transaction-accessed data that requires high-speed block-level access to hard disks, such as e-mail servers, databases, and high-use file servers.
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