Data Sets Replicas Placements Strategy from Cost-Effective View in the Cloud

Algorithm 1

Replica scarce resource testing.

Input: data set , , , ;

Output: if is a replica scarce resource, return true; else return false;

(01) count the data set ’s requested access times using logs files;

(02) set ;

(03) sum the data set ’s response time using logs files;

(04) set ;

(05) set ;

(06) if (() and ())

(07)  return true;

(08) else

(09)  return false;

(10) End.