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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. 

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: 

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 

GLYPH<SM590000> OSA CHPID code changes might require PCHID Vary OFF/ON to activate new code. 

GLYPH<SM590000> Crypto code changes might require PCHID Vary OFF/ON to activate new code. 

Note:  zUDX clients should contact their User Defined Extensions (UDX) provider before installing Microcode Change Levels (MCLs). Any changes to Segments 2 and 3 from a previous MCL level might require a change to the client’s UDX. Attempting to install an incompatible UDX at this level results in a Crypto checkstop. 

## 9.9.1 Resource Group and native PCIe MCLs 

Microcode fixes, referred to as individual MCLs or packaged in Bundles, might be required to update the Resource Group code and the native PCIe features. Although the goal is to minimize changes or make the update process concurrent, the maintenance updates at times can require the Resource Group or the affected native PCIe to be toggled offline and online to implement the updates. The native PCIe features (managed by Resource Group code) are listed Table 9-1. 

<img src='content_image/1001024.jpg'>

Consider the following points for managing native PCIe adapters microcode levels: 

GLYPH<SM590000> Updates to the Resource Group require all native PCIe adapters that are installed in that RG to be offline. For more information about the requirement, see Appendix C, “Native Peripheral Component Interconnect Express” on page 469. 

GLYPH<SM590000> Updates to the native PCIe adapter require the adapter to be offline. If the adapter is not defined, the MCL session automatically installs the maintenance that is related to the adapter. 

