3PAR InForm® OS 2.2.4 Concepts Guide (320-200085 Rev B, March 2009)

2.4
3PAR Storage Concepts and Terminology
3PAR InForm OS Concepts Guide InForm OS Version 2.2.4
Figure 2-1 shows a RAID 0 logical disk with a set size of 1 and a row size of 3:
Figure 2-1. Data is Striped Across Chunklets on a RAID 0 Logical Disk
2.1.2.1.2 RAID 1 and 10
On a RAID 10 logical disk, data is striped across RAID 1 (or mirrored) sets. A RAID 1 set is made
up of two or more chunklets that contain the same data. The chunklets in each set are on
different physical disks, which may also be on different drive magazines or even in different
drive cages. The number of chunklets in a RAID 1 set is the set size (or mirror depth). The
number of sets in each row is the row size. The system accesses data from a RAID 10 logical disk
in step sizes. A step size is the number of contiguous bytes that the system accesses before
moving on to the next chunklet.
A
D
n-2
.. .
Step size
Set size
Row size
= Chunklet
RAID 0 logical disk
B
E
n-1
. . .
C
F
n
. . .