Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

237Creating volumes

Creating a volume on specific disks

Figure 7-1 Example of using ordered allocation to create a mirrored-stripe volume

For layered volumes, vxassist applies the same rules to allocate storage as for non-

layered volumes. For example, the following command creates a striped-mirror volume

with 2 columns:

# vxassist -b -g mydg -o ordered make strmirvol 10g \

layout=stripe-mirror ncol=2 mydg01 mydg02 mydg03 mydg04

This command mirrors column 1 across disks mydg01 and mydg03, and column 2 across

disks mydg02 and mydg04, as illustrated in Figure 7-2.

Figure 7-2 Example of using ordered allocation to create a striped-mirror volume

Additionally, you can use the

col_switch attribute to specify how to concatenate space

on the disks into columns. For example, the following command creates a mirrored-stripe

volume with 2 columns:

# vxassist -b -g mydg -o ordered make strmir2vol 10g \

layout=mirror-stripe ncol=2 col_switch=3g,2g \

mydg01 mydg02 mydg03 mydg04 mydg05 mydg06 mydg07 mydg08

This command allocates 3 gigabytes from mydg01 and 2 gigabytes from mydg02 to

column 1, and 3 gigabytes from mydg03 and 2 gigabytes from mydg04 to column 2. The

Striped plex

Mirror

Mirrored-stripe

volume

Column 1 Column 2 Column 3

mydg01-01 mydg02-01 mydg03-01

mydg04-01 mydg05-01 mydg06-01

Mirror

Striped-mirror volume

Underlying mirrored volumes

Column 1

Column 2

mydg01-01

mydg03-01

mydg02-01

mydg04-01

Striped plex