3.2.5 Background Task 3.3 Pools menu Chapter 3. Graphical user interface overview  107 Extent size (MB) Maximum non  thin-provisioned  volume capacity  in GB  Maximum  thin-provisioned  volume capacity  in GB Maximum  compressed  volume size Maximum MDisk  capacity in GB Total storage  capacity  manageable  per system* 0016 2,048 (2 TB) 2,000 2 TB 2,048 (2 TB) 064 TB Table 3-1 Extents Figure 3-33 Background Task pane Figure 3-32 Selecting Background Tasks Use the Background Tasks pane to view and manage current tasks that are running on the  system (see Figure 3-32 on page 107). The Background Tasks pane displays all long-running tasks that are in progress on the  system. Tasks, such as volume synchronization, array initialization, and volume formatting,  can take some time to complete. The Background Tasks page displays these tasks and their  progress. After the task completes, the task is automatically deleted from the display. If a task  fails with an error, select  Monitoring  Events  to determine the problem. Figure 3-33 shows  an example of a FlashCopy Operation. A  pool  or storage pool is a collection of MDisks that jointly contain all of the data for a  specified set of volumes. All MDisks in a pool are split into  extents  of the same size. The size  of the extent defines the maximum usable capacity of an IBM Storwize Virtual System. An  IBM Storwize Virtual System can address 2^22 extents. This enables you to address a  maximum of 32 PB with 8192 MB extents. Table 3-1 lists the extent sizes.