NOTE: Enable dynamic cache read prefetch must be disabled if the virtual disk is used for databaseapplications or applications with a large percentage of random reads.9. From the Segment size list, select an appropriate segment size.10. Click Finish.The virtual disks are created.NOTE: A message prompts you to confirm if you want to create another virtual disk. Click Yes to proceedfurther, else click No.Changing The Virtual Disk Modification PriorityYou can specify the modification priority setting for a single virtual disk or multiple virtual disks on a storage array.Guidelines to change the modification priority of a virtual disk:• If more than one virtual disk is selected, the modification priority defaults to the lowest priority. The currentpriority is shown only if a single virtual disk is selected.• Changing the modification priority by using this option modifies the priority for the selected virtual disks.To change the virtual disk modification priority:1. In the AMW, select the Storage & Copy Services tab.2. Select a virtual disk.3. In the menu bar, select Storage → Virtual Disk → Change → Modification Priority.The Change Modification Priority window is displayed.4. Select one or more virtual disks. Move the Select modification priority slider bar to the desired priority.NOTE: To select nonadjacent virtual disks, press click and select the appropriate virtual disks. To selectadjacent virtual disks, press click the appropriate virtual disks. To select all of the available virtualdisks, click Select All.5. Click OK.A message prompts you to confirm the change in the virtual disk modification priority.6. Click Yes.7. Click OK.Changing The Virtual Disk Cache SettingsYou can specify the cache memory settings for a single virtual disk or for multiple virtual disks in a storage array.Guidelines to change cache settings for a virtual disk:• After opening the Change Cache Settings dialog, the system may display a window indicating that the RAIDcontroller module has temporarily suspended caching operations. This action may occur when a new battery ischarging, when a RAID controller module has been removed, or if a mismatch in cache sizes has been detectedby the RAID controller module. After the condition has cleared, the cache properties selected in the dialogbecome active. If the selected cache properties do not become active, contact your Technical Supportrepresentative.• If you select more than one virtual disk, the cache settings default to no settings selected. The current cachesettings appear only if you select a single virtual disk.• If you change the cache settings by using this option, the priority of all of the virtual disks that you selected ismodified.To change the virtual disk cache settings:64
