4.2 General considerations for Data Reduction Pools 4.2.1 Data Reduction Pool limitations This section discusses limitations with Standard Pool and Data Reduction Pools. Table 4-2 describes the limitations of Data Reduction Pools (IBM FlashSystem 9100 V8.2.1)  at the time of writing. Table 4-2 Data Reduction Pool limitations Property Maximum  Number Comments Data Reduction Pools per  system 4 MDisks per Data Reduction  Pool 128 Volumes per Data Reduction  Pool 10000 - (Number  of Data Reduction  Pools x 12)  Extents per I/O group per  Data Reduction Pool 128K  Compressed volume copies in  data reduction pools per  system - No limit is imposed here beyond  the volume copy limit per data  reduction pool Compressed volume copies in  data reduction pools per I/O  group - No limit is imposed here beyond  the volume copy limit per data  reduction pool Deduplicated volume copies  in data reduction pools per  system - No limit is imposed here beyond  the volume copy limit per data  reduction pool Deduplicated volume copies  in data reduction pools per I/O  group - No limit is imposed here beyond  the volume copy limit per data  reduction pool Fully-allocated volume  capacity 256 TB Maximum size for an individual  fully-allocated volume.  Maximum size is dependent on  the extent size of the Storage  Pool. Comparison Table: Maximum  Volume, MDisk and System  capacity for each  extents size. 70  IBM FlashSystem 9200 and 9100 Best Practices and Performance Guidelines