2.5.5 Virtual Flash Memory 2.5.6 Preplanned memory IBM Virtual Flash Memory (VFM) FC 0614 replaces the Flash Express features (0402 and  0403) that were available on the IBM z13s. It offers up to 2.0 TB of virtual flash memory in up  to four 512 MB increments for improved application availability and to handle paging workload  spikes.  No application changes are required to change from IBM Flash Express to VFM. Consider the  following points: VFM is offered as a dialed 512GB memory increment size. Feature code 0614 represents  one 512GB zVFM increment, as shown in the following example: FC 0614 - Min=0, Max=4 VFM is designed to help improve availability and handling of paging workload spikes when  z/OS V2.1, V2.2, or V2.3, or on z/OS V1.13$^{7}$ is run. With this support, z/OS is designed to  help improve system availability and responsiveness by using VFM across transitional  workload events, such as market openings and diagnostic data collection. z/OS is also  designed to help improve processor performance by supporting middleware use of pageable  large (1 MB) pages. VFM can also be used in coupling facility images to provide extended capacity and availability  for workloads that are use IBM WebSphere MQ Shared Queues structures. The use of VFM  can help availability by reducing latency from paging delays that can occur at the start of the  workday or during other transitional periods. It is also designed to help eliminate delays that  can occur when collecting diagnostic data during failures.  VFM can help organizations meet their most demanding service level agreements and  compete more effectively. VFM is easy to configure, and provides rapid time to value. Preplanned memory helps plan for nondisruptive memory upgrades. The required hardware  is pre-plugged based on a target capacity that is specified by the customer. This pre-plugged  hardware is enabled by way of an LICCC order that is placed by the customer when they  determine that more memory capacity is needed. The pre-plugged memory can be made  available through a LICCC update.  GLYPH<SM590000> Dialed memory + zVFM = total hardware plugged GLYPH<SM590000> Dialed memory + Plan Ahead memory + VFM = total hardware plugged GLYPH<SM590000> The IBM Resource Link website (login required)  GLYPH<SM590000> Your IBM representative  For more information about ordering this LICCC, see the following resources: 7 z/OS V1.13 includes more requirements. For more information, see Chapter 7, “Oper ating system support” on  page 209. Chapter 2. Central processor complex hardware components  45