Advantages: serves multiple (many, many, many) users from a centralized repository of software; superb virtualization; unrivaled speed; no PC yet equals the maximum memory of a mainframe (IBM has world’s largest computer at Los Alamos, approaching intelligence levels of living beings); superb process automation; superb calculation speed; superb support (due of course to the heavy price paid) from an intense corporate infrastructure
Disadvantages: intense resource consumption; intense human attention required; intense space occupied
Advantages: serves multiple (many, many, many) users from a centralized repository of software; superb virtualization; unrivaled speed; no PC yet equals the maximum memory of a mainframe (IBM has world’s largest computer at Los Alamos, approaching intelligence levels of living beings); superb process automation; superb calculation speed; superb support (due of course to the heavy price paid) from an intense corporate infrastructure
Disadvantages: intense resource consumption; intense human attention required; intense space occupied
The main disadvantages are mainly:
* Price
* Space
* Operations
For advantages
please read the article on http://www.answers.com/Mainframe Computer