Chapter 6: Managing Logical Drives and Hot Spares ● 732 Modify the available settings as required for your logical drive (not all options are availablefor all controllers or all RAID levels):● Logical drive size (see page 69)● Stripe size (see the following section)● Write cache (see further down on this page)● Read cache (see page 74)● Initialize priority (see page 74)● Initialize method (see page 74)3 Click Next.4 To apply the changes immediately, click Apply.To schedule the changes for later, click Schedule, then set the date and time. (For moreinformation, see Scheduling a Task on page 111.)Changing the Stripe SizeThe stripe size is the amount of data (in KB) written to one partition before the controllermoves to the next partition in a logical drive.Stripe size options vary, depending on your controller. Normally, the default stripe sizeprovides the best performance.For RAID 6 and RAID 60 logical drives, the more disk drives there are in the logical drive, thefewer the stripe size options.Changing the Write Cache SettingThe write cache setting determines when data is stored on a disk drive and when the controllercommunicates with the operating system.● Disabled (write-through)—The controller sends (or writes) the data to a disk drive, thensends confirmation to the operating system that the data was received. Use this settingwhen performance is less important than data protection.● Enabled (write-back)—The controller sends confirmation to the operating system that thedata was received, then writes the data to a disk drive. Use this setting when performance ismore important than data protection and you aren’t using a battery-backup cache.Enabled is the default setting.Note: (RAID 10, 50, and 60 only) All logical drives within a RAID 10/50/60 logical drive must havethe same write cache setting—either all write-through or all write-back.To quickly change the write cache setting:1 Click the logical drive you want.2 In the menu bar, select Actions, click Configure write cache, then select Enabled orDisabled as required.The write cache setting is changed.
