IBM Midrange System DS4000 Series Hardware Manual page 211

2. In the Create Array window, type a meaningful array name that describes your set of disks,
and then select either Automatic mode or Manual mode. Automatic mode is the default
option, as shown in Figure 4-58. By selecting the Automatic option, the Storage Manager
software selects a combination of available drives to optimize performance and availability,
and attempts to select physical drives from different enclosures in order to provide
enclosure protection whenever possible. Click Next.
Figure 4-58 Create array and assign a name and mode
The automatic creation of the array selects the drives in the following order:
– Same capacity-same speed enclosure redundancy
– Same capacity-mixed speed enclosure redundancy
– Same capacity-mixed speed no enclosure redundancy
– Mixed capacity-same or mixed speed-no enclosure redundancy
In manual mode, you have to select all the drives individually. Make sure that you select
them to maximize performance and availability.
3. Click Next in order to select the RAID level.
– Select the desired RAID level. The window now displays the different capacity options
depending on the unconfigured drives available in your configuration. If you have
different disk sizes, you have more than one option for the same number of disks. See
4.1.1, "DS5000 arrays and RAID levels" on page 104 to determine the best RAID level
for your specific environment and application.
– Select the total capacity required and click Finish.
Chapter 4. IBM System Storage DS planning and configuration
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