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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Preparing host servers to recopy virtual disk

NOTE: Before you create a copy of a source virtual disk, stop any data access (I/O) activity or suspend data transfer to the source virtual disk (and, if applicable, the target disk) to ensure that you capture an accurate point-in-time image of the source virtual disk. Close all applications, including Windows Internet Explorer, to make sure all I/O activity has stopped.
NOTE: Removing the physical disk letter of one or more associated virtual disks in Windows or unmounting the virtual physical disk in Linux helps to guarantee a stable copy of the physical disk for the virtual disk copy.
Before creating a new virtual disk copy for an existing copy pair, both the host server and the associated virtual disk you are recopying have to be in the proper state. Perform the following steps to prepare your host server and virtual disk:
  1. Stop all I/O activity to the source and target virtual disk.
  2. Using your Windows system, flush the cache to both the source and the target virtual disk—if mounted. At the host prompt, type: SMrepassist -f <filename-identifier> and press <Enter>.
    For more information, see SMrepassist Utility.
  3. Click the Summary tab, then click Storage & Copy Services to ensure that the virtual disk is in Optimal or Disabled status.
  4. Remove one or more physical disk letters of the source and (if mounted) virtual disk in Windows or unmount one or more virtual physical disks in Linux to help guarantee a stable copy of the physical disk for the virtual disk. If this is not done, the copy operation reports that it has completed successfully, but the copied data is not updated properly.
  5. Follow any additional instructions for your operating system. Failure to follow these additional instructions can create unusable virtual disk copies.
    NOTE: If your operating system requires more instructions, you can find those instructions in your operating system documentation.
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