VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Understanding VERITAS Volume Manager
Volume Layouts in VxVM
Chapter 130
all of the disks in the array, reducing the write time for large
independent writes because the writes do not have to wait until a single
parity disk can accept the data.
Figure 1-21 Parity Locations in a RAID-5 Model
RAID-5 and how it is implemented by the VxVM is described in “Volume
Manager RAID-5 Arrays” on page 31.
RAID-5 volumes can additionally perform logging to minimize recovery
time. RAID-5 volumes use RAID-5 logs to keep a copy of the data and
parity currently being written. RAID-5 logging is optional and can be
created along with RAID-5 volumes or added later.
Traditional RAID-5 Arrays
A traditional RAID-5 array is several disks organized in rows and
columns. A column is a number of disks located in the same ordinal
position in the array. A row is the minimal number of disks necessary to
Parity
Parity
Data
Data
Data
Data
Data
Parity
Data
Data
Parity
Data
Stripe 1
Stripe 4
Stripe 3
Stripe 2