Xserve RAID Schemes
A RAID scheme refers to how the storage device’s RAID sets are configured with different RAID levels. You can configure the Xserve RAID system with a variety of storage schemes.
The illustrations show examples of the three standard versions of Xserve RAID hardware— 4 drive modules, 7 drive modules, and 14 drive modules. An additional illustration shows examples of Xserve RAID systems connected to a host system or fibre channel switch.
A System With Four Drive Modules
You can use the following RAID levels on an Xserve RAID system with four drive modules:
mRAID 0
mRAID 1
mRAID 3
mRAID 5
mRAID 0+1
mRAID 10
Note: This list is representative but does not include all possible schemes.
RAID 0 Schemes
You can use RAID 0 in several ways, depending on how you divide the drive modules between the RAID controllers.
If two modules are on each controller, two drives can be striped together for each controller.
RAID 0
Appears
as
Stripe | Stripe | Disk 1 | Disk 2 |
If all the drive modules are on one RAID controller, the drives can be striped together.
RAID 0
Appears
as
Stripe | Disk 1 |
66 Chapter 8
