GLYPH<SM590000> The existing DS8870 frames, excluding adapters, storage enclosures are disk drives, are  returned to IBM. GLYPH<SM590000> A converted DS8870 is not eligible for further conversion to DS8880. GLYPH<SM590000> Any additional upgrades must be performed after model conversion is complete. Chapter 16. DS8870 to DS8880 model conversion  491 It is important to plan to have additional capacity within your environment to support all of the  data that will be migrated from the DS8870 as the DS8870 will be unavailable during the  model conversion process. The amount of time it takes to complete data migration varies on  configuration and environment. The model conversion process requires that all data be migrated off of the system and the  logical configuration and encryption groups to be removed. All infrastructure also needs to be  in place prior to start of the conversion process. This process can take a considerable amount  of time, which varies dependant on system configuration. All of the prerequisites are client  responsibilities and is not included as part of the model conversion service. It is important to  plan for several days of the DS8870 being unavailable during model conversion to DS8880.  All of the prerequisites must be completed prior to the IBM Service Representative performing  the model conversion process. If you are making changes to the HMC configuration a new configuration worksheet will need  to be provided to the SSR, otherwise the SSR will copy the current configuration For more  information see Chapter 8, “IBM DS8880 Management Console planning and setup” on  page 219.  IBM will mechanically replace all of the frames within the DS8870 system. During this period  of time, additional floor space to perform the mechanical conversion will need to be provided.  The IBM Service Representative will physically relocate the storage enclosures, disk drives,  and adapter cards from the DS8870 frames to the DS8880 frames.  Model conversion is not a concurrent operation. You will need to plan on the DS8870 being  unavailable until conversion is complete to DS8880. This process might include migration of  data to another storage system. Sufficient capacity and infrastructure to perform this  migration will need to be included in your planning. Because the metadata size has changed, the configuration of the DS8870 cannot be copied  to the new DS8880 directly. This must be configured as though the DS8880 were a new  machine. It is important to plan the model conversion in a similar manner to a new installation. The  physical infrastructure requirements are different between DS8870 and DS8880, so the use  of existing power and any existing Earthquake Resistance Kit is not possible. The existence of  this infrastructure is therefore a prerequisite for model conversion.  It is easier to divide the process into distinct phases, allowing each phase to be planned and  performed individually. The four phases are best described as planning, prerequisites,  mechanical conversion, and post conversion. The following sections describe each. 16.3 Model Conversion Phases 16.3.1 Planning 16.3.2 Prerequisites Data Migration