Bloomberg: IBM Sells 1,000th Mainframe Model; Promotes `Virtual' Servers

"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 their reliability.

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 December."

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