VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 7, Creating Volumes

Creating a Volume on Specific Disks

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See the vxassist(1M) manual page for more information about using storage attributes.

It is alsopossible tocontrolhow volumesarelaid out onthe speciﬁedstorage as described

in the next section “Specifying Ordered Allocation of Storage to Volumes.”

Specifying Ordered Allocation of Storage to Volumes

If you specify the -o ordered option to vxassist when creating a volume, any storage

that you also specify is allocated in the following order:

1. Concatenate disks.

2. Form columns.

3. Form mirrors.

For example, the following command creates a mirrored-stripe volume with 3 columns

and 2 mirrors on 6 disks:

# vxassist -b -o ordered make mirstrvol 10g layout=mirror-stripe \

ncol=3 disk01 disk02 disk03 disk04 disk05 disk06

This command places columns 1, 2 and 3 of the ﬁrst mirror on disk01, disk02 and

disk03 respectively, and columns 1, 2 and 3 of the second mirror on disk04, disk05

and disk06 respectively. This arrangement is illustrated in “Example of Using Ordered

Allocation to Create a Mirrored-Stripe Volume.”

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 -o ordered make strmirvol 10g layout=stripe-mirror \

ncol=2 disk01 disk02 disk03 disk04

Striped Plex

Mirror

Mirrored-Stripe

Volume

Column 1 Column 2 Column 3

disk01-01 disk02-01 disk03-01

disk04-01 disk05-01 disk06-01