Creating a volume <a class="indexterm" name="id407821"></a><a class="indexterm" name="id407828"></a>


Creating a volume
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Creating a volume

Veritas Volume Manager uses logical volumes to organize and manage disk space. A volume is made up of portions of one or more physical disks, so it does not have the limitations of a physical disk.

For databases where the data storage needs to be resilient and the data layout needs to be optimized for maximum performance, we recommend using VxVM. The striping and mirroring capabilities offered by a volume manager will help you achieve your manageability, availability, and performance goals.

After you decide on a volume layout, you can use the vxassist command to create the volume.

Before creating a volume, make sure the following conditions are met:

Usage notes

Creating a volume requires a disk group name, volume name, volume size, and volume layout. You will also need to know subdisk names if you are creating a striped volume.
Striped or mirrored volumes require at least two disks.
Striped pro and concatenated pro volumes are mirrored by default, so a striped pro volume requires more disks than an unmirrored striped volume and a concatenated pro volume requires more disks than an unmirrored concatenated volume.
You cannot use a striped pro or concatenated pro volume for a root or swap volume.
A RAID-5 volume requires at least three disks. If RAID-5 logging is enabled, a RAID-5 volume requires at least four disks.

RAID-5 mirroring is not supported.

To create a volume

Use the vxassist command as follows:
```
# /opt/VRTS/bin/vxassist -g disk_group make volume_name \
size disk_name
```
The following is an example of creating a volume using the vxassist command:

To create a 1 GB mirrored volume called db01 on the PRODdg disk group:
```
# /opt/VRTS/bin/vxassist -g PRODdg make db01 1g PRODdg01
```

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