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Increasing the size of an aggregate that uses physical drives

You can add disks or array LUNs to an aggregate so that it can provide more storage to its associated volumes.

Before you begin

About this task

This procedure should not be used for aggregates composed of root or data partitions.

Following these best practices when you add storage to an aggregate optimizes aggregate performance:


  1. Verify that appropriate spare disks or array LUNs are available for you to add: storage aggregate show-spare-disks -original-owner node_name
    For disks, make sure that enough of the spares listed are of the correct type, size, speed, and checksum type for the target RAID group in the aggregate to which you are adding the disks.
  2. Add the disks or array LUNs: storage aggregate add-disks -aggregate aggr_name [-raidgroup raid_group_name] disks

    If you are adding disks with a different checksum than the aggregate, as when creating a Flash Pool aggregate, or if you are adding disks to a mixed checksum aggregate, you must use the -checksumstyle parameter.

    If you are adding disks to a Flash Pool aggregate, you must use the -disktype parameter to specify the disk type.

    If you specify the -raidgroup parameter, the storage is added to the RAID group you specify. raid_group_name is the name that Data ONTAP gave to the group—for example, rg0. If you are adding SSDs to the SSD cache of a Flash Pool aggregate, you do not need to specify the RAID group name; the SSD RAID group is selected by default based on the type of the disks you are adding.

    disks specifies the disks to be added in one of the following ways:

    • -diskcount, usually further qualified by disk type or checksum type
    • -disklist disk1 [disk2...]

    If possible, you should use the diskcount option. Doing so allows Data ONTAP to optimize the disk selection for your configuration.

    If you are adding disks to a mirrored aggregate and you are specifying disk names, you must also use the -mirror-disklist parameter.