VERITAS Volume Manager 3.1 Administrator's Guide

Introduction to Volume Manager

Virtual Object Data Organization (Volume Layouts)

Chapter 144

Figure 1-13 Example of a Striped Plex with Concatenated Subdisks per

Column

RAID-5

NOTE You may need an additional license to use this feature.

RAID-5 provides data redundancy by using parity. Parity is a calculated

value used to reconstruct data after a failure. While data is being written

to a RAID-5 volume, parity is calculated by doing an exclusive OR

(XOR) procedure on the data. The resulting parity is then written to the

volume. If a portion of a RAID-5 volume fails, the data that was on that

portion of the failed volume can be recreated from the remaining data

and parity information.

RAID-5 volumes maintain redundancy of the data within a volume.

VM Disks

Physical Disks

SU = Stripe Unit

disk02-01

disk02-02

Striped Plex

disk01-03

column 1

column 2

column 3

devname

disk01

disk01-01

disk01-02

disk01-03

disk02

disk02-01

disk02-02

disk03

disk03-01

su1

su2

su3

su4

su5

su6

su1 su4

su2 su5

su3 su6

disk01-02

disk01-01

disk03-01