# Changing the stripe-unit size

(Startable-CD mode only.)

Use this action to set the size of the chunk of data that the controller reads from each physical drive at a time. To maximize overall performance, choose a stripe-unit size that is close to the size of the system I/O request.

Attention: After you configure an array and store data on the logical drives, you cannot change the stripe-unit size without destroying data in the logical drives.

1. In the tree, click (controller).
2. Right-click Change stripe-unit size a stripe-unit size. The following choices are available:
   - 8 KB

   > With this stripe-unit size, an array can have a maximum of 16 physical drives.

   - 16 KB

   > With this stripe-unit size, an array can have a maximum of 16 physical drives.

   - 32 KB

   > This setting is available if the controller supports an array with 16 physical drives using a 32 KB stripe-unit size, or the controller contains no arrays with more than 8 physical drives. Otherwise, this setting is unavailable.

   - 64 KB

   > This setting is available if the controller supports an array with 16 physical drives using a 64 KB stripe-unit size, or the controller contains no arrays with more than 8 physical drives. Otherwise, this setting is unavailable.

## More information

- Fine-tuning your system
- Understanding stripe-unit size
- Understanding enabled and disabled read-ahead cache mode

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