Versions

1.0 (1984)
    Support for the HP Integral PC (embedded ROM version)basic kernel
    runs from ROM other commands are disk based.
    
2.0 (1987)
    First release for series 800. There may have been a different 2.x
    version for series 200 at an earlier date.
    
3.x (1988)
    Series 600/800 only. Note: 2.x/3.x (for series 600/800) were developed
    in parallel with 5.x/6.x (for series 200/300/400), so, e.g., 3.x was
    really contemporary with 6.x. The two lines were united at 7.x (with
    different minor numbers for different series), so that series 800 jumped
    from 3.1 to 7.0 and series 300 from 6.5 to 7.01.
    
5.0 (1985)
    Updated and renamed HP-UX 1.0 for the HP Integral PC. Supported series
    200, 300 and 500.
    
6.x (1988)
    Support for 300 series only. Introduced sockets from 4.3BSD. This
    version (together with 3.x) also introduced a feature of context
    dependent files (CDF), a method of allowing a fileserver to serve
    different configurations and binaries (and even architectures) to
    different client machines in a heterogeneous environment. A directory
    containing such files had its suid bit set and was made hidden from both
    ordinary and root processes under normal use. Such a scheme was sometimes
    exploited by hackers to hide exploits.[3] CDF's and the CDF filesystem
    were dropped with release 10.0.
    
7.x (1990)
    Support for 300/400, 600/700 (in 7.03) /800 HP systems.[4] Provided OSF/Motif.
8.x (January 1991)

    Support for 300/400 600/700/800 HP systems.[4] Shared libraries introduced.

9.x (July 1992)
    9.00, 9.02, 9.04 (s600/s800), 9.01, 9.03, 9.05, 9.07 (s300/s400/s700),
    9.08 (s700), 9.09 (s700), 9.09+ (s700), 9.10 (s300/s400 only). These
    provided support for the series 300, 700 and 800 HP systems.
    Introduced SAM.The Logical Volume Manager (LVM) was presented at 9.00
    for s800 as a replacement for the older methods of disk management.
    The easiest was to determine the platform that a version of HP-UX 9.x
    would run on was by the last digit. Even numbers ran on servers, odd
    numbers ran on workstations.
    
10.0 (1995)
    This major release saw a convergence of the operating system between
    the series 700 (workstation) and series 800 (server) systems. (The OS
    no longer supported the older series.) There was also a significant
    change in the layout in the system files and directories, based on
    the AT&T SVR4 UNIX standard. Applications were removed from /usr and
    moved under /opt; startup configuration files were placed under
    /etc/rc.config.d; users were moved to /home from /users. Software
    for HP-UX was now packaged, shipped, installed, and removed via the
    Software Distributor (SD) tools. LVM was made available for s700, too.
    
10.01 (1995)
10.02 (1995)
10.03 (1996)
10.08 (1996)
10.09 (1996)
10.10 (1996)
10.16 (1996)
10.20 (1996)
    This release included support for PA-RISC processors that support PA2.0,
    including 64-bit data registers. Pluggable Authentication Modules (PAM
    were introduced for use within CDE. The root file system could be configured
    to use the Veritas File System (VxFS). For legacy as well as technical reasons,
    the file system used for the boot kernel remained Hi Performance FileSystem
    (HPFS; a variant of UFS) until version 11.23. 10.20 also supported 32-bit user
    and group identifiers. The prior limit was 60,000, or 16-bit. This and earlier
    releases of HP-UX are now effectively obsolete, and support by HP ended on
    June 30, 2003.
    
10.24
    This is a Virtual Vault release of HP-UX, providing enhanced security features.
    Virtual Vault is a compartmentalised operating system in which each file is
    assigned a compartment and processes only have access to files in the
    appropriate compartment and unlike most other UNIX systems the superuser
    (or root) does not have complete access to the system without following
    correct procedures.
    
10.30 (1997)
    This was primarily a developer release with various incremental enhancements.
    The use of PAM continued to expand in the system security components.
    Various changes to system calls were also made. This OS also provided
    the first support for Kernel Threads, with a 1x1 thread model (each user
    thread is bound to one kernel thread). 10.30 was also the first release
    of HP-UX that was fully year 2000 compliant.
    
11.00 (1997)
    The first HP-UX release to also support 64-bit addressing; previous releases
    had been 32-bit only. It could still run 32-bit applications on a 64-bit
    system. This release was also deemed Y2K-compliant. It supported 1×1 kernel
    threads, symmetric multiprocessing, fibre channel, and NFS PV3. It also
    included tools and documentation to convert 32-bit code to 64-bit.
    
11.04
    Virtual Vault release.
    
11.10
    This was a limited release to support the V2500 SCA (Scalable Computing
    Architecture) and V2600 SCA servers. Other versions supported the V-class
    server in a single cabinet configuration, 11.10 ran on the SCA versions
    where two servers are stacked on top of each other, interconnected by a
    hyperplane crossbar. 11.10 also added JFS 3.3, 128-CPU support, AutoFS,
    and a new ftpd. It was not available separately.
    
11.11 (2000)
    Also known as 11i, this release of HP-UX introduced the concept of Operating
    Environments. It was released in December, 2000. These are bundled groups of
    layered applications intended for use with a general category of usage. The
    available types were the Mission Critical, Enterprise, Internet, Technical
    Computing, and Minimal Technical OEs. (The last two were intended for HP 9000
    workstations.) The main enhancements with this release were support for hard
    partitions, gigabit ethernet, NFS over TCP/IP, Loadable Kernel Modules, dynamic
    kernel tunable parameters, kernel event Notifications, and protected stacks.
    
11.20 (2001)
    Also known as 11i v1.5, this release of HP-UX was the first to support the
    new line of Itanium-based (IA-64) systems. It was not intended for mission
    critical computing environments and did not support HP's ServiceGuard cluster
    software. It did provide support for running PA-RISC compiled applications on
    IA-64 systems, and for Veritas Volume Manager 3.1.
    
11.22 (2002)
    An incremental release of the Itanium version of HP-UX, it was designated 11i
    v1.6. This version achieved 64-way scalability, MxN threads, added more dynamic
    kernel tunable parameters, and supported HP's Logical Volume Manager on IA-64.
    It was built from the 11i v1 source code stream.
    
11.23 (2003)
    The original release of this version was in September 2003 to support the
    Itanium-based systems. This version is also identified as 11i v2. In September
    2004 the OS was updated to provide support for both Itanium and PA-RISC
    systems. Besides running on IA-64 systems, this release includes support for
    ccNUMA, web-based kernel and device configuration, IPv6 and a strong random
    number generation.
    
11.31 (2007)
    This release is also identified as HP-UX 11i v3. This release supports both
    PA-RISC and IA-64.[5] It was released on February 15, 2007.[6] Major new
    features include native multipathing support, a unified file cache, NFS v4,
    Veritas ClusterFS, multi-volume VxFS, and integrated virtualization.
    Hyperthreading is supported on Itanium systems with Montecito processors.
    HP-UX 11i v3 conforms to the The Open Group's UNIX 03 standard.[7]