block level


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block level

Reading and writing a disk at the physical level. The disk controller in every computer and server reads and writes the disks at the block level. In storage area networks (SANs), where the disks are in cabinets external to the server, read/write access is also at the block level.

Block Level Vs. File Level
An application accesses data by file name (logical), which is translated into block level (physical) for reading and writing by the operating system's file system.

Users always deal with data at the file level; however, database and network administrators may get involved at the block level, because they can stipulate where data are physically stored for performance issues.

NAS vs. SAN
Although a stand-alone unit with its own disks, a network attached storage (NAS) device has its own file system for file level access. Because a SAN uses block level access and has no file system with its associated overhead, a SAN is much faster than a NAS. See SAN, NAS and file system.

Remote Block Level Access
With IP storage, block level access can be extended via the IP protocol to remote locations. See SAN and IP storage.

Blocks Are Also Logical
Modern drives maintain their own tables of good and bad sectors and remap requests on the fly. As a result, the physical block reads and writes are translated by the drive into actual sector reads and writes, making the block access somewhat like a logical request, rather than 100% physical.


References in periodicals archive ?
Sensory block height was assessed at 1 minute interval using pin prick test in mid clavicular line until it reached T10 level and then every 2 minutes until it reached peak sensory block level (PSBL).
He informed that immediately after this event in Mathura district, the Ministry of Culture will be organising similar Block level events in other States too so as to kick start the process of scaling up the efforts to cover all the Blocks of the Country.
Integrity: Stored data encryption should eliminate integrity issues by authenticating tape media at the block level.
It will be one of the major tool to maintain the demand and supply uniformly all over the country up to the block level and will benefit farmers during the peak demand season.
Today's solutions seek to reduce disk utilization by compressing the data or reducing unintended redundancy through coalescence at the file or block levels.
With a strong system engineering team and the capability to develop digital, mixed signal and RF block level and complete IC's, NewLogic provides cost effective services to help semiconductor companies and other IC users achieve their business objectives.
The Union Minister of Human Resource Development Smt Smriti Irani will present the First National Awards for Innovation in Educational Administration to selected District and Block Level Education Officers from across the country at a function organized by the National University of Educational Planning and Administration (NUEPA) in New Delhi tomorrow.
Here's the background: DAS and SAN handle data on the block level, while IP-connected NAS manages it on the file level; and never the twain shall meet.
Early block level floorplanning analysis is limited by the availability of block pin assignments.
etc for conveyance of Treated water from CWR(at WTP) to different block level GLRs including construction of GLRs, Pump House, Sub-Station Building, Chlorine Room and other related Structure as required and pumping main for conveyance of treated Water from different block level GLRs to zonal OHRs and related electromechanical works including 06 month trial run and performance gurantee test followed by 12 month operation and maintenance
Chris Van Wagoner, director of product marketing at Comm Vault said, "The backup world in general, and Comm Vault in particular, has looked to block level technologies to provide better performance.