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Adding disks to a storage system

You add disks to a storage system to increase the number of hot spares, to add space to an aggregate, or to replace disks.

Before you begin

You must have confirmed that your storage system supports the type of disk you want to add. For information about supported disk drives, see the Hardware Universe at

About this task

You use this procedure to add physical disks to your storage system. If you are administering a storage system that uses virtual disks, for example, a system based on Data ONTAP-v technology, see the installation and administration guide that came with your Data ONTAP-v system for information about adding virtual disks.


  1. Check the NetApp Support Site for newer disk and shelf firmware and Disk Qualification Package files. If your system does not have the latest versions, update them before installing the new disk.
  2. Install one or more disks according to the hardware guide for your disk shelf or the hardware and service guide for your storage system.

    The new disks are not recognized until they are assigned to a system and pool. You can assign the new disks manually, or you can wait for Data ONTAP to automatically assign the new disks if your system follows the rules for disk autoassignment.

  3. After the new disks have all been recognized, verify their addition and their ownership information by entering the following command: disk show -v
    You should see the new disks, owned by the correct system and in the correct pool, listed as hot spare disks.
  4. You can zero the newly added disks now, if needed, by entering the following command: disk zero spares
    Note: Disks that have been used previously in a Data ONTAP aggregate must be zeroed before they can be added to another aggregate. Zeroing the disks now can prevent delays in case you need to quickly increase the size of an aggregate. The disk zeroing command runs in the background and can take hours to complete, depending on the size of the non-zeroed disks in the system.


The new disks are ready to be added to an aggregate, used to replace an existing disk, or placed onto the list of hot spares.