## Changing the stripe-unit size

(Startable-CD mode only.)

Use this action to s et the size of the chunk of data the controller reads from each drive at a time.

1. Click a controller from the Main Tree.
2. Click Actions --> Change stripe-unit size.
3. Click 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 K 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 K stripe-unit size, or the controller contains no arrays with more than 8 physical drives. Otherwise, this setting is unavailable.

To maximize overall performance, choose a 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.

### See also

Performance tuning your system
Understanding read-ahead cache mode
Understanding stripe-unit size