Support Element & HMC
The Support Element is the most direct and lowest level way to access a mainframe. It circumvents even the Hardware Management Console and the operating system running on the mainframe. The HMC is a PC connected to the mainframe and emulates the Support Element. All preceding zSeries mainframes used a modified version of OS/2 with custom software to provide the interface. System z9's HMC no longer uses OS/2, but instead uses a modified version of Linux with an OS/2 lookalike interface to ease transition as well as a new interface. Unlike the previous HMC application on OS/2, the new HMC is web-based which means that even local access is done via a web browser. Remote HMC access is available, although only over an SSL encrypted HTTP connection. The web-based nature means that there is no longer a difference between local console access and remote access, which means a remote user potentially has full control if authorized, allowing more flexibility for locating systems within data centers. IBM refers to the new HMC as a "closed platform" which does not allow the user to install software or access the command line interface to increase security and stability. The HMC is also firewalled by default with a minimal number of open ports for remote access.
Famous quotes containing the words support and/or element:
“Parents everywhere, trying to bring up kids in a plugged-in, supercharged, high-tech world, need all the information and support we can give each other.”
—Ron Taffel (20th century)
“What was any art but an effort to make a sheath, a mould in which to imprison for a moment the shining, elusive element which is life itselflife hurrying past us and running away, too strong to stop, too sweet to lose?”
—Willa Cather (18731947)