6.3 Working with internal drives and arrays 6.3.1 Working with drives Listing disk drives An array is a type of MDisk that is made up of disk drives (or flash drive modules); these  drives are members of the array. A Redundant Array of Independent Disks (RAID) is a  method of configuring member drives to create high availability and high-performance groups.  The system supports nondistributed (traditional) and distributed array configurations. This section describes how to manage internal storage disk drives and configure them to be  used in arrays. The system provides an Internal Storage pane for managing all internal drives. To access the  Internal Storage pane, click  Pools  Internal Storage , as shown in Figure 6-42. The pane gives an overview of the internal drives in the system. Selecting  All Internal  in the  drive class filter displays all drives that are managed in the system, including all I/O groups  and expansion enclosures.  Selecting  All Internal  under the Drive Class Filter shows all the drives that are installed in the  managed system, including attached expansion enclosures. Alternatively, you can filter the  drives by their type or class. For example, you can choose to show only Enterprise drive class  (serial-attached Small Computer System Interface (SCSI) or (SAS)), Nearline SAS, or Flash  drives. Selecting the class of the drives on the left side of the pane filters the list and display  only the drives of the selected class. You can find information regarding the capacity allocation of each drive class in the upper  right corner, as shown in Figure 6-42: If  All Internal  is selected under the drive class filter, the values shown refer to the entire  internal storage.  242  Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V8.2.1 GLYPH<SM590000> MDisk Capacity shows the storage capacity of the selected drive class that is assigned to  MDisks.  GLYPH<SM590000> Spare Capacity shows the storage capacity of the selected drive class that is used for  spare drives.  GLYPH<SM590000> Total Capacity shows the overall capacity of the selected drive class.  Figure 6-42 Internal storage pane