By EMC Corporation
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Extra info for Information Storage and Management v2 Student Guide
The physical components of connectivity are the hardware elements that connect the host to storage. Three physical components of connectivity between the host and storage are host interface device, port, and cable A host interface device or host adapter connects a host to other hosts and storage devices. Examples of host interface devices are host bus adapter (HBA) and network interface card (NIC). Host bus adaptor (HBA) is an application-specific integrated circuit (ASIC) board that performs I/O interface functions between the host and storage, relieving the CPU from additional I/O processing workload.
These files reside in the file systems. 3. The file systems are mapped to file system blocks. 4. The file system blocks are mapped to logical extents of a logical volume. 5. These logical extents in turn are mapped to the disk physical extents either by the operating system or by the LVM. 6. These physical extents are mapped to the disk sectors in a storage subsystem. If there is no LVM, then there are no logical extents. Without LVM, file system blocks are directly mapped to disk sectors. Cont..
A DBMS controls the creation, maintenance, and use of a database. The DBMS processes an application’s request for data and instructs the operating system to transfer the appropriate data from the storage. Copyright © 2012 EMC Corporation. All rights reserved Module 2: Data Center Environment 6 Users store and retrieve data through applications. The computers on which these applications run are referred to as hosts or compute systems. Hosts can be physical or virtual machines. A compute virtualization software enables creating virtual machines on top of physical compute infrastructure.