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

Chapter 7, Creating Volumes

Creating a Striped Volume

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For a volume that will be written to sequentially, such as a database log volume, use the

following command to specify that sequential DRL is to be used:

# vxassist [-g diskgroup] make volume length layout=mirror \

logtype=drlseq

To add DRL logging to a volume that has DCO enabled, or to change the number of DRL

logs, follow the procedure that is described in “Adding DRL Logging to a Mirrored

Volume” on page 197.

If you use ordered allocation when creating a mirrored volume on speciﬁed storage, you

can usethe optional logdisk attribute to specify on which disks the logplexes should be

created. Use the following form of the vxassist command to specify the disks from

which space for the logs is to be allocated:

# vxassist [-g diskgroup] -o ordered make volume length \

layout=mirror logtype=log_type logdisk=disk[,disk,...] \

storage_attributes

If you do not specify the logdisk attribute, vxassist locates the logs in the data plexes

of the volume.

For more information about ordered allocation, see “Specifying Ordered Allocation of

Storage to Volumes” on page 167 and the vxassist(1M) manual page.

Creating a Striped Volume

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

A striped volume contains at least one plex that consists of two or more subdisks located

on two or more physical disks. For more information on striping, see “Striping (RAID-0)”

on page 17.

Note A striped volume requires spaceto beavailable on at least asmany disksin the disk

group as the number of columns in the volume.

To create a striped volume, use the following command:

# vxassist [-b] [-g diskgroup] make volume length layout=stripe

Note Specify the -b option if you want to make the volume immediately available for

use. See “Initializing and Starting a Volume” on page 181 for details.

For example, to create the 10-gigabyte striped volume volzebra, use the following

command:

# vxassist -b make volzebra 10g layout=stripe