Create Logical Drive Wizard - Customize Advanced Logical Drive Parameters

Use the Create Logical Drive Wizard - Customize Advanced Logical Drive Parameters dialog to customize the advanced parameters for an individual logical drive, based on configuration requirements. If you want a tailored I/O characteristic, select Custom, and enter values for the cache read ahead multiplier and the .


Note:

You can change the cache read ahead multiplier later by selecting Logical Drive >> Change >> Cache Settings .


Important:

You can change the segment size of the logical drive later by selecting Logical Drive >> Change >> Segment Size . However, any change in segment size is restricted to a multiple of the current segment size, or a divider of 2 from the current segment size. For example, if you set the segment size to 64 KB when you first created the logical drive, you can only change it to 32 KB or 128 KB by selecting Logical Drive >> Change >> Segment Size .

  1. Specify the logical drive I/O characteristics for the logical drive based on your needs. The expected I/O characteristics of the logical drive are used by the storage management software to indicate an appropriate default logical drive segment size and cache read ahead multiplier.

    When you specify expected I/O characteristics, the corresponding default cache read ahead multiplier value and the corresponding segment size value that are typically well suited for those I/O patterns are populated in the Cache read ahead multiplier area and the Segment size area.

    Choose from the logical drive I/O characteristics shown in the table:

    Choice Value of the Cache Read Ahead Multiplier Segment Size Value
    File system (typical) 1 64 KB
    Database 0 64 KB
    Multimedia 8 128 KB
    Custom Select your own Select your own
  2. Specify the . Choices include either the controller in slot A or the controller in slot B.

    These results occur, depending on how you are creating the logical drive:

    • If you are creating this logical drive from an Unconfigured Capacity node – The automatically selects the owner. You can change the preferred owner by selecting alternate controller.
    • If you are creating this logical drive from a – The storage subsystem automatically sets the preferred controller ownership by determining the of the other logical drives in the . You can change the preferred owner by selecting alternate controller.
  3. To move to the next wizard dialog, click Next.

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