User`s guide

Chapter 6. Configuring Your Array
EK–SWRA2–IG. C01 6–17
6.4.2 Planning the Configuration
You already started planning your configuration when you selected what to
purchase for your StorageWorks RAID Array 200 Series Subsystem. Prior to
actually configuring the subsystem, you need to plan how you want to maximize
the resources that you purchased. To that end, this section includes two sample
configurations to show you ways that you can configure to maximize the
potential of your subsystem.
The following samples demonstrate configurations that feature:
• Data availability
• Drive connectivity and performance
6.4.2.1 Sample Configuration for Data Availability
The configuration shown by this example provides redundancy in the event of a
drive or channel failure. The drive redundancy is achieved by the use of RAID 5
logical RAID drives. The channel redundancy is achieved by locating all the
drives in a drive group on separate channels, whereby, if a channel fails, the
subsystem would continue to work in the same manner that it would in the event
of a disk failure.
In the configuration example shown in Table 6–1, we configured twenty-one, 1
GB capacity disk drives into 7 drive groups, on which we created 7 RAID 5
Logical RAID drives. For more information on the number of drives used in each
group, and usable capacity, see Section 6.6.1 of this Chapter. For more
information on the group type, See Chapter 1.