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Looks like Sun can do Solaris faster than HP can HP-Ux:

HP unveils Unix roadmaps
By Ashlee Vance in Chicago
Published Monday 16th August 2004 16:35 GMT

HP World HP will be a pitching a story of Unix harmony and advancement at its HP World user conference here this week. The harmony comes from better aligned processor and operating system support for HP-UX, and the advancement comes in the form of upgraded partitioning and clustering tools. Most of the new technology, however, will take a long time to arrive.

First up, HP has now released HP-UX 11i V2 for both its Itanium and PA-RISC based servers. This means PA-RISC customers no longer have to wait until HP-UX 11i V3 arrives to use the same operating system as their Itanium counterparts. The bad news, however, is that both sets of customers will have to wait until the second half of next year to get their hands on V3 - a product once due at the end of this year................

In its third quarter hardware bomb, HP noted a 25 percent drop in NonStop sales and a 32 percent fall in Alpha server sales. You have to believe that IBM and Sun are picking some of these customers up.

While HP-UX is impressive on a number of fronts, including the iCOD and nPar/vPar technology, it has certainly fallen well behind AIX and especially Solaris overall. Both IBM and Sun appear to be able to advance their OSes at a quicker clip than HP. If HP is putting serious R&D money into HP-UX, it's not showing as well as it should. PA-RISC, Alpha and Itanium customers must be concerned.

http://www.theregister.co.uk/2004/08/16/hpworld_unix_upgrades/