The, already was delayed from a to early March. But one customer testing early systems encountered a problem involving "memory robustness," said IBM spokesman Jim Larkin, and the server maker postponed general shipments until it can resolve the issue.
The systems now are scheduled for June 11 availability, Larkin said. The problem "has been completely resolved to the satisfaction of IBM and the customer," he added.
The JS20 embodies three major IBM server strategies. First, it uses a member of IBM's Power family processors, which the company aimed initially at Intel's Itanium and Sun Microsystems' UltraSparc, but which increasingly competes with Intel's widely used Xeon as well.
Second, the JS20 runs, an operating system that bridges some divides between IBM's four server lines. Linux is comparatively common on "x86" processors such as Intel's Xeon and Advanced Micro Devices' Opteron, but IBM is trying to build a comparably vigorous .
Last, the JS20 is a, a type of system that slides snugly alongside others in a chassis that provides shared components such as power supplies and networking switches. IBM believes that many of today's lower-end standalone servers eventually will be replaced by blade servers.
The problem with the JS20 doesn't involve its processor, the, Larkin said. IBM has had manufacturing problems with the chips, but said earlier in May that the .
However, shipments of Apple Computer's Xserve, which also uses the PowerPC 970, have beenfrom IBM. "Obviously we were not happy with the delivery we got," Timothy Cook, Apple's executive vice president of worldwide sales and operations, said in April, adding that the company hopes to have caught up with demand by the end of June.