The operating system HP- UX was developed 9000 series of computers of HP, started in 1982 with a System III (later System V ) conforming version and the HP 9000 Series 500, with the independently developed by HP FOCUS CPU architecture worked. Already 1983 200 ( later 300 series and 400 series ) took place at a port 680x0 - based workstations the series. As of 1986, the port to the PA -RISC was done with the HP 9000 Series 800 Series (server) and the later introduced HP 9000 Series 700 (workstations ). Since 2000, starting with the version of HP- UX 11i, the architecture of the Intel Itanium support. Since 2003, starting with version HP- UX 11.23 are exclusively server, either PA-RISC or Itanium -based support.
After the purchase of Compaq was planned, clustering techniques (especially the cluster file system AdvFS and the cluster software TruCluster ) to incorporate from the Tru64 UNIX operating system in HP- UX, but this project was canceled in late 2004.
For HP- UX can currently be a significant downward trend, probably at least for the most part has its cause in the fact that the HP -UX platform " Itanium " has been stagnant for a long time and with the performance improvements and further developments of the x86 -64 systems well in the long run can not keep up and will therefore gradually loses the confidence of the manufacturer, the trade press and ultimately the customer. Also stagnating the development of HP- UX, at least compared to Linux or Windows, the future is uncertain. The biggest competitor Linux is not limited to certain HP hardware and runs on all current architectures, HP- UX, however, can be used in addition to the now out- PA -RISC only on Itanium machines.
With HP- UX for the first time introduced the access control list for extended permissions control when accessing files on UNIX. HP- UX AIX was one of the first Unix derivatives, the one logical volume manager integrated in the operating system. In addition to the HP LVM, which was derived from the joint project OSF / 1, has been available since version 11:11 the VxVM ( Veritas Volume Manager ) is derived as well as the VxFS file system from working with Veritas used by default.
The installation of software and managing software packages via the Software Distributor (SD -UX), which implements the POSIX 1387.2 -1995 standard. SD -UX is able to manage centralized software repositories and make installations over a network.
The operating system is scalable from workstation with a CPU to Superdome ( HP's largest computer class) with 128 CPUs ( cores) and 2 TiB maximum main memory ( and 16 TiB maximum file size). With OLA / R ( On-line addition / replacement) it is possible to add or replace a running system PCI cards.
On Itanium computers, programs that are compiled for PA - RISC architecture, continue to be used without modification. An emulation layer ( ARIES - Automatic Recompilation and Integrated Environment Simulation) takes on the necessary mapping.