Dell PowerVault MD3660i Administrator's Guide - Page 115
Storage Array Performance During Virtual Disk Copy, Setting Copy Priority, Stopping A Virtual Disk
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Storage Array Performance During Virtual Disk Copy The following factors contribute to the overall performance of the storage array: • I/O activity • Virtual disk RAID level • Virtual disk configuration - Number of drives in the virtual disk groups • Virtual disk type - Snapshot virtual disks may take more time to copy than standard virtual disks During a virtual disk copy, resources for the storage array are diverted from processing I/O activity to completing a virtual disk copy. This affects the overall performance of the storage array. When you create a new virtual disk copy, you define the copy priority to determine how much controller processing time is diverted from I/O activity to a virtual disk copy operation. Setting Copy Priority You can use the Copy Manager to select the rate at which a virtual disk copy completes for a selected copy pair. You can change the copy priority for a copy pair at any of these times: • Before the virtual disk copy begins • While the virtual disk copy has a status of In Progress • When you re-create a virtual disk copy To set copy priority: 1. In the AMW, select the Storage & Copy Services tab and select Copy Services → Virtual Disk Copy → Manage Copies. The Copy Manager window is displayed. 2. In the table, select one or more copy pairs. 3. Select Change → Copy Priority. The Change Copy Priority window is displayed. 4. In the Copy Priority area, select the appropriate copy priority, depending on your system performance needs. NOTE: There are five copy priority rates available: - lowest - low - medium - high - highest If the copy priority is set at the lowest rate, I/O activity is prioritized, and the virtual disk copy takes longer. Stopping A Virtual Disk Copy You can stop a virtual disk copy operation that has an In Progress status, a Pending status, or a Failed status. Stopping a virtual disk copy that has a Failed status clears the Needs Attention status displayed for the storage array. Keep these guidelines in mind when you stop a virtual disk copy: • To use this option, select only one copy pair in the Copy Manager. 115
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