Combining performance and capacity in the same system requires that you identify  performance workloads that will represent the majority of your I/O, and assume data  reduction using inline hardware compression.  In addition, you must identify capacity workloads that can maximise capacity with modest I/O,  and assume data reduction with deduplication and compression.  Identifying the workload demands enables you to create a balanced high-performance,  high-capacity system with a single point of management. As the workload evolves, you might  need to migrate between fully allocated and data reduction volumes, so careful monitoring is  required. Besides using test volumes, and observing actual performance for the application, IBM also  has a tool called  Disk Magic  that is designed specifically for modeling performance. Disk Magic for IBM is a performance analysis and hardware configuration planning tool for  IBM storage disk subsystems that runs only on Microsoft Windows (XP or later). It is licensed  by IBM from IntelliMagic for exclusive use by IBMers and IBM Business Partners in the selling  of new or upgraded IBM disk storage solutions. Proper initial sizing greatly helps to avoid future sizing problems. Disk Magic is one tool that is  used for sizing and modeling storage subsystems for various open systems environments  and various IBM platforms.  It provides accurate performance and capacity analysis and planning for IBM Spectrum  Virtualize products, other IBM storage solutions, and other vendors’ storage subsystems.  Disk Magic provides in-depth environment analysis, and is an excellent tool to estimate the  performance of a system that is running (DRP) Data Reduction Pools. For IBM Business Partners who would like more information about Disk Magic, and the latest  version, can be found at the Disk Magic website (login required). This section highlights the implications storage pool configurations and host volume  assignments have on availability.  This section includes: Although the FS9100 provides many advantages through consolidation of storage, it is  important to understand the implications that various configurations have on defining failure  domains within the IBM Spectrum Virtualize Storwize cluster. When you select MDisks for a  storage pool, performance is often the primary consideration. However, in many cases, the  availability of the configuration is traded for little or no performance gain. Remember that IBM Spectrum Virtualize and Storwize must take the entire storage pool  offline if a single MDisk in that storage pool goes offline. Consider an example where you  60  IBM FlashSystem 9100 Architecture, Performance, and Implementation 3.11.1 Availability considerations when configuring storage pools 3.11 Availability considerations when configuring the FS9100 3.10.8 Evaluating workload using Disk Magic GLYPH<SM590000> Availability considerations when configuring storage pools GLYPH<SM590000> Availability considerations for host volume assignments