GLYPH<SM590000> Improved thermal, altitude, and condensation management GLYPH<SM590000> Server Time Protocol (STP) recovery enhancement GLYPH<SM590000> Design of pervasive infrastructure controls in processor chips in memory ASICs. GLYPH<SM590000> Improved error checking in the processor recovery unit (RU) to better protect against word  line failures in the RU arrays. GLYPH<SM590000> The HMC can query whether a system is ready for a concurrent driver upgrade. GLYPH<SM590000> Previous firmware updates, which require an initial machine load (IML) of the z14 ZR1 to  be activated, can block the ability to run a concurrent driver upgrade. Enhanced Console Assisted Recovery (ECAR) was new with z13s and z13 GA2 and  carried forward to z14. It contains better recovery algorithms during a failing Primary Time  Server (PTS) and uses communication over the HMC/SE network to assist with BTS  takeover. For more information, see Chapter 11, “Hardware Management Console and  Support Elements” on page 357. Enhanced Driver Maintenance (EDM) is one more step toward reducing the necessity for and  the duration of a scheduled outage. One of the components to planned outages is LIC Driver  updates that are run in support of new features and functions. When correctly configured, z14 ZR1 supports concurrently activating a selected new LIC  Driver level. Concurrent activation of the selected new LIC Driver level is supported only at  specific released sync points. Concurrently activating a selected new LIC Driver level  anywhere in the maintenance stream is not possible. Certain LIC updates do not allow a  concurrent update or upgrade. Consider the following key points regarding EDM: 9.8 z14 ZR1 Enhanced Driver Maintenance GLYPH<SM590000> An icon on the SE allows you or your IBM SSR to define the concurrent driver upgrade  sync point to be used for an EDM. GLYPH<SM590000> The ability to concurrently install and activate a driver can eliminate or reduce a planned  outage. GLYPH<SM590000> Concurrent crossover from Driver level  N  to Driver level  N +1, then to Driver level  N +2,  must be done serially. No composite moves are allowed. GLYPH<SM590000> Disruptive upgrades are permitted at any time, and allow for a composite upgrade (Driver  N  to Driver  N +2). GLYPH<SM590000> Concurrently backing up to the previous driver level is not possible. The driver level must  move forward to driver level  N +1 after EDM is started. Unrecoverable errors during an  update might require a scheduled outage to recover. GLYPH<SM590000> Specific complex code changes might dictate a disruptive driver upgrade. You are alerted  in advance so that you can plan for the following changes: – Design data or hardware initialization data fixes – CFCC release level change The EDM function does not eliminate the need for planned outages for driver-level upgrades.  Upgrades might require a system level or a functional element scheduled outage to activate  the new LIC. The following circumstances require a scheduled outage: 338  IBM 14 Model ZR1 Technical Guide