HP 12000 HP StorageWorks 12000 Gateway Virtual Library System User Guide (AH81 - Page 118

6. Select the Fibre Channel host port's topology in the Topology Preferred box for each Fibre Channel host port. Auto-Allows the VLS to determine the Fibre Channel port's topology Loop-Sets the topology type to an arbitrated loop Fabric-Sets the topology type to fabric 7. Select a link speed in the Link Speed Preferred box for each Fibre Channel host port. Auto-Allows the VLS to determine the Fibre Channel port's link speed 1-1 Gb per second 2-2 Gb per second 4-4 Gb per second 8. When you are finished configuring the Fibre Channel ports, click Apply Settings. 9. Restart the VLS device emulations to make the changes take effect. See "Restarting VLS Device Emulations" on page 144. Managing Oversubscription Because the VLS dynamically allocates storage space as data is written to virtual media, the VLS allows you to allocate more cartridge capacity than is physically installed. This feature, called oversubscription, permits configuring your system for anticipated storage growth; configure cartridges beyond your current capacity and then seamlessly add physical storage later. By default, oversubscription is disabled. NOTE: Using oversubscription, you run the risk of running out of physical storage capacity and requires careful planning of your storage needs and a review of your current storage policy. Enabling and Disabling Oversubscription To enable oversubscription: In Command View VLS: 1. Select the System tab. 2. Select Chassis in the navigation tree. The chassis details window opens. 3. In the Oversubscription section, select Enabled. 4. The Notify when storage capacity is [x] % Full box defaults to 90. You may change the value or leave it at 90. This percentage value is the threshold of storage space consumed that when reached triggers a storage capacity notification alert. If this threshold is set to zero (0), an alert will be sent only when existing capacity has been reached. 5. Click Apply Settings. To disable oversubscription, deselect the Enabled box. 118 Configuration