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Creating unmirrored data aggregates

You can optionally create unmirrored data aggregates for data that does not require the redundant mirroring provided by MetroCluster configurations.

  • You should know what drives or array LUNs will be used in the new aggregate.

  • If you have multiple drive types in your system (heterogeneous storage), you should understand how you can verify that the correct drive type is selected.

Attention

In MetroCluster FC configurations, the unmirrored aggregates will only be online after a switchover if the remote disks in the aggregate are accessible. If the ISLs fail, the local node may be unable to access the data in the unmirrored remote disks. The failure of an aggregate can lead to a reboot of the local node.

Note
The unmirrored aggregates must be local to the node owning them.

  • Drives and array LUNs are owned by a specific node; when you create an aggregate, all drives in that aggregate must be owned by the same node, which becomes the home node for that aggregate.

  • Aggregate names should conform to the naming scheme you determined when you planned your MetroCluster configuration.

  • The

    Disks and Aggregates Power Guide contains more information about mirroring aggregates.
  1. Display a list of available spares: storage disk show -spare -owner node_name
  2. Create the aggregate: storage aggregate create

    If you are logged in to the cluster on the cluster management interface, you can create an aggregate on any node in the cluster. To verify that the aggregate is created on a specific node, you should use the -node parameter or specify drives that are owned by that node.

    You can specify the following options:

    • Aggregate's home node (that is, the node that owns the aggregate in normal operation)

    • List of specific drives or array LUNs that are to be added to the aggregate

    • Number of drives to include

    • Checksum style to use for the aggregate

    • Type of drives to use

    • Size of drives to use

    • Drive speed to use

    • RAID type for RAID groups on the aggregate

    • Maximum number of drives or array LUNs that can be included in a RAID group

    • Whether drives with different RPM are allowed

    For more information about these options, see the storage aggregate create man page.

    The following command creates a unmirrored aggregate with 10 disks:
    controller_A_1::> storage aggregate create aggr1_controller_A_1 -diskcount 10 -node controller_A_1
    [Job 15] Job is queued: Create aggr1_controller_A_1. 
    [Job 15] The job is starting. 
    [Job 15] Job succeeded: DONE
  3. Verify the RAID group and drives of your new aggregate: storage aggregate show-status -aggregate aggregate-name