Modify reserve capacity Fibre Channel ports Additional information can be displayed by modifying the view: In our example, eight 16 Gbps FC ports are displayed, each showing the following information  in the default view: To view the Fibre Channel (FC) ports of the IBM FlashSystem 900 interface cards, select  System Actions Fibre Channel Ports . The Fibre Channel Ports window opens. The amount of usable capacity that is available for volumes is reduced and cannot be provisioned. Select  Modify Reserve capacity  and click  Modify  to allocate a portion of the usable capacity  as shown in Figure 7-27. Out of the usable flash storage capacity that is available, the system sets aside a specific  amount of that capacity for system management tasks, which reduces the overall usable  capacity that is available for volumes. You can modify the amount of flash storage capacity that is reserved for system management  tasks. For non-compression-enabled systems, such as FlashSystem AE1 and AE2, this can  be used to improve system performance. For compression-enabled systems such as  FlashSystem AE3, reserve space can be used to prevent over-allocating the system. Figure 7-27 Modify capacity reservation GLYPH<SM590000> Type: FC or Ethernet GLYPH<SM590000> WWPN/GUID: Worldwide port name (WWPN) and globally unique identifier (GUID) GLYPH<SM590000> Protocol: Fibre Channel Arbitrated Loop (FC-AL) or Fibre Channel-Peer to Peer (FC-P2P) GLYPH<SM590000> Port speed: Auto, 16 Gbps, 8 Gbps, 4 Gbps, or 2 Gbps GLYPH<SM590000> Port state GLYPH<SM590000> Depiction of port location 204  Implementing IBM FlashSystem 900 Model AE3