"International Business Machines Corp. has sold its
1,000th zSeries mainframe computer in what one analyst calls ``a
year of resurgence'' for the refrigerator-size machines known for
Some companies are cutting costs by eliminating ``farms'' of
smaller server computers that run Web sites and network printers.
Instead, they are installing one mainframe and partitioning it into
scores or even hundreds of ``virtual'' servers running the free
Linux operating system, said David Mastrobattista, an analyst at
Giga Information Group, a computer-industry research firm.
Sales growth of servers running Unix operating systems has been
sluggish as the economy slows. Meanwhile, IBM, the largest computer
maker, says mainframe sales have grown at least 10 percent for the
last three quarters compared with year-earlier results. The largest
computer maker introduced the zSeries 900 mainframe in
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