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IBM Z Connectivity Handbook by Octavian Lascu, Bo Xu, Esra Ufacik, John Troy, Frank Packheiser, Michal Kordyzon, Hervey Kamga, Bill White

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Flash Express feature
This appendix briefly describes the optional Flash Express feature of the z13, z13s, zEC12, and zBC12 platforms. The following topics are covered in this appendix:
Replacement of Flash Express
 
Note: Starting with the IBM z14, Flash Express (FC #0402 and FC 0403) was replaced by Virtual Flash memory (VFM). VFM implements Extended Asynchronous Data Mover (EADM) architecture by using HSA-like memory instead of Flash card pairs.
The VFM features come in two sizes:
For z14, one VFM feature is 1.5 ...

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