外文文献阅读笔记

A dynamic replica management strategy in data grid

--- Journal of Network and Computer Applications expired, propose, indicate, profitable, boost, claim, present, congestion, deficiency, moderately, metric, turnaround, assume,specify, display, illustrate, issue,

outperform over .... about 37%, outperform ....

lead to

draw one's attention

accordingly

have great influence on

take into account

in terms of

play major role in

in comparison with, in comparison to

i.e.=(拉丁)id est

Replication is a technique used in data grid to improve fault tolerance and to reduce the bandwidth consumption.

Managing this huge amount of data in a centralized way is ineffective due to extensive access latency and load on the central server.

Data Grids aggregate a collection of distributed resources placed in different parts of the world to enable users to share data and resources.

Data replication is an important technique to manage large data in a distributed manner.

There are three key issues in all the data replication algorithms which are replica placement, replica management and replica selection.

Meanwhile, even though the memory and storage size of new computers are ever increasing, they are still not keeping up with the request of storing large number of data.

each node along its path to the requester.

Enhanced Dynamic Hierarchical Replication and Weighted Scheduling

Strategy in Data Grid

--- Journal of Parallel and Distributed Computing duration, manually, appropriate, critical, therefore, hybrid, essential, respectively, candidate, typically, advantage, significantly, thereby, adopt, demonstrate, superiority, scenario, empirically, feasibility, duplicate, insufficient, interpret, beneficial, obviously, whilst, idle, considerably, notably, consequently, apparently,

in a wise manner

according to

from a size point of view

depend on

carry out

is comprised of

along with

as well as

to the best of our knowledge

Best replica placement plays an important role for obtaining maximum benefit from replication as well as reducing storage cost and mean job execution time.

Data replication is a key optimization technique for reducing access latency and managing large data by storing data in a wise manner.

Effective scheduling in the Grid can reduce the amount of data transferred among nodes by submitting a job to a node where most of the requested data files are available.

Effective scheduling of jobs is necessary in such a system to use available resources such as computational, storage and network efficiently.

Storing replicas close to the users or grid computation nodes improves response time, fault tolerance and decreases bandwidth consumption.

The files of Grid environments that can be changed by Grid users might bring an important problem of maintaining data consistency among the various replicas distributed in different machines.

So the sum of them along with the proper weight (w1,w2) for each factor yields the combined cost (CCi,j) of executing job i in site j.