HP Veritas Volume Manager 5.0 -UX 11i v3 manual Creating a volume on any disk

Creating volumes

Creating a volume on any disk

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To discover the value in blocks of the alignment that is set on a disk group, use this command:

#vxprint -g diskgroup -G -F %align

By default, vxassist automatically rounds up the volume size and attribute size values to a multiple of the alignment value. (This is equivalent to specifying the attribute dgalign_checking=round as an additional argument to the vxassist command.)

If you specify the attribute dgalign_checking=strict to vxassist, the command fails with an error if you specify a volume length or attribute size value that is not a multiple of the alignment value for the disk group.

Creating a volume on any disk

By default, the vxassist make command creates a concatenated volume that uses one or more sections of disk space. On a fragmented disk, this allows you to put together a volume larger than any individual section of free disk space available.

Note: To change the default layout, edit the definition of the layout attribute defined in the /etc/default/vxassist file.

If there is not enough space on a single disk, vxassist creates a spanned volume. A spanned volume is a concatenated volume with sections of disk space spread across more than one disk. A spanned volume can be larger than any disk on a system, since it takes space from more than one disk.

To create a concatenated, default volume, use the following form of the vxassist command:

#vxassist [-b] [-g diskgroup] make volume length

Note: Specify the -boption if you want to make the volume immediately available for use. See “Initializing and starting a volume” on page 260 for details.

For example, to create the concatenated volume voldefault with a length of

10 gigabytes in the default disk group:

# vxassist -b make voldefault 10g