Figure 2-6. Diagram Of Raid 0+1 Write; Table 2-5 Raid 0+1 Example - Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Hardware User's Manual

2-16 RAID Array 3000 Pedestal Storage Subsystem Hardware User's Guide
Figure 2-6 shows a diagram of RAID 0+1 write.

Figure 2-6. Diagram of RAID 0+1 write

In the event of a drive failure, a RAID 0+1 array will enter degraded mode and
continue to operate by substituting the failed drive with its mirror.
When the controller creates a RAID 0+1 set, it first sorts the drives by channel
number and SCSI ID. Then it stripes the data across every other drive and
forms a mirrored pair with the first two drives, another mirrored pair with the
second two drives, and so on. Table 2–5 lists how the controller uses the drives
in a RAID 0+1 set.
Drives Selected
Channel 1, ID 0
Channel 1, ID 1
Channel 1, ID 2
Channel 2, ID 0
Channel 2, ID 1
Channel 2, ID 2
Table 2-5
RAID 0+1 Example
Function
First member of stripe set
Mirror of channel 1, ID 0
Second member of stripe set
Mirror of channel 1, ID 2
Third member of stripe set
Mirror of channel 2, ID 1