Civil Rights
Movements, leaders, victories and the continuing fight for equality.
q2K BHP
Black History Portal
THE BHP WIRE —
HIDDEN TRUTHS
What's New!
Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
In 1968 Shirley Chisholm became the first Black woman elected to the United States Congress. In 1972 she launched a campaign for the Democratic presidential nomination, breaking another political barrier.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
 | This article needs more citations. (August 2008) |
A grid file system is a computer file system whose goal is improved reliability and availability by taking advantage of many smaller file storage areas.[1]
File systems contain up to three components:
A grid file system would have similar needs:
Because file systems are designed to appear as a single disk for a single computer to manage (entirely), many new challenges arise in a grid scenario whereby any single disk within the grid should be capable of handling requests for any data contained in the grid.
Most file storage utilizes layers of redundancy to achieve a high level of data protection (inability to lose data). Current means of redundancy include replication and parity checks. Such redundancy can be implemented via a RAID array (whereby multiple physical disks appear to a local computer as a single disk, which may include data replication, and/or disk partitioning). Similarly, a grid file system would consist of some level of redundancy (either at the logical file level, or at the block level, possibly including some sort of parity check) across the various disks present in the "grid".
First and foremost, a file table mechanism is necessary. Additionally, the file table must include a mechanism for locating the (target/destination) file within the grid. Secondly, a mechanism for working with file data must exist. This mechanism is responsible for making file data available to requests.
With BitTorrent technology, a parallel can be drawn to a grid file system, in that a torrent tracker (and search engine) would be the "file table", and the torrent applications (transmitting the files) would be the "file data" component. An RSS feed like mechanism could be utilized by file table nodes to indicate when new files are added to the table, to instigate replication and other similar components.
A file system may incorporate similar technology (distributed replication, distributed data request/fulfillment).
If both such systems (file table, and file data) were capable of being addressed as a single entity (i.e. using virtual nodes in a cluster), then growth into such a system could be easily controlled simply by deciding which uses the grid member would be responsible (file table and file lookups, and/or file data).
Assuming there exists some method of managing data replication (assigning quotas, etc.) autonomously within the grid, data could be configured for high availability, regardless of loss or outage.
The largest problem currently revolves around distributing data updates. Torrents support minimal hierarchy (currently implemented either as metadata in the torrent tracker, or strictly as UI and basic categorization). Updating multiple nodes concurrently (assuming atomic transactions are required) presents latency during updates and additions, usually to the point of not being feasible. Additionally, a grid (network based) file system breaks traditional TCP/IP paradigms in that a file system (generally low level, ring 0 type of operations) require complicated TCP/IP implementations, introducing layers of abstraction and complication to the process of creating such a grid file system.
Examples of high-available data include:
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
A grid file system is a computer file system whose goal is improved reliability and availability by taking advantage of many smaller file storage areas.
Gfarm file system is an open-source distributed file system, generally used for large-scale cluster computing and wide-area data sharing, and provides features to manage replica location explicitly. The name is derived from the Grid Data Farm architecture it implements. Grid Datafarm is a petascale data-intensive computing project initiated in Japan. The project is a collaboration among High Energy Accelerator Research Organization (KEK), National Institute of Advanced Industrial Science and Technology (AIST), the University of Tokyo, Tokyo Institute of Technology and University of Tsukuba. The challenge involves construction of a Peta- to Exascale parallel filesystem exploiting local storage of PCs spread over the worldwide Grid.
The Irish grid reference system is a system of geographic grid references used for paper mapping in Ireland (both Northern Ireland and the Republic of Ireland). Any location in Ireland can be described in terms of its distance from the origin (0, 0), which lies off the southwest coast. The Irish grid partially overlaps the British grid, and uses a similar co-ordinate system but with a meridian more suited to its westerly location.
The Multi Protocol File System (MPFS) is a multi-path network filesystem technology developed and sold by EMC Corporation. MPFS is intended to allow hundreds to thousands of client computer nodes to access shared computer data with higher performance than conventional NAS file-sharing protocols such as NFS.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →The Greenwood District.
