Virtual Disk Copy 915 Set the copy priority for the virtual disk copy and click Next.The source virtual disk, the target virtual disk, and the copy priority settingthat you selected appear on the Create virtual disk copies—ConfirmCopy Settings dialog. The higher priorities allocate more resources to thevirtual disk copy at the expense of the storage array’s performance. Formore information, see "Setting Copy Priority" on page 91.Storage Array Performance During Virtual DiskCopyThe following factors contribute to the overall performance of the storagearray:• I/O activity• Virtual disk RAID level• Virtual disk configuration — Number of drives in the virtual disk groups• Virtual disk type — Snapshot virtual disks might take more time to copythan standard virtual disksDuring a virtual disk copy, resources for the storage array are diverted fromprocessing I/O activity to completing a virtual disk copy. This affects theoverall performance of the storage array. When you create a new virtual diskcopy, you define the copy priority to determine how much controllerprocessing time is diverted from I/O activity to a virtual disk copy operation.Setting Copy PriorityThe Copy Priority setting defines how much of the storage array’s resourcesare used to complete a virtual disk copy, rather than to fulfill I/O requests.Changing the copy priorities sets the rate at which a virtual disk copy iscompleted.Five copy priority rates are available: lowest, low, medium, high, and highest.If the copy priority is set at the lowest rate, I/O activity is prioritized and thevirtual disk copy takes longer. At the highest priority rate, the virtual disk copyis prioritized, and I/O activity for the storage array is slower.
