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>12.1. When to create a volume</H1
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>EVMS treats volumes and storage objects separately.
A storage object does not automatically
become a volume; it must be made into a volume.</P
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>Volumes are created from storage objects.
Volumes are either EVMS native volumes or compatibility volumes. Compatibility volumes
are intended to be compatible with a volume manager other than EVMS, such as the Linux
LVM, MD, OS/2 or AIX. Compatibility volumes might have restrictions on what EVMS can do with
them. EVMS native volumes have no such restrictions, but they can be used only by an
EVMS equipped system. Volumes are mountable and can contain file systems.</P
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>EVMS native volumes contain EVMS-specific information to identify
the volume name. After this volume information is
applied, the volume is no longer fully backward compatible
with existing volume types.</P
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>Instead of
adding EVMS metadata to an existing object, you can tell EVMS to make an object directly available as a volume. This type of
volume is known as a compatibility volume. Using this method, the final product is fully
backward-compatible with the desired system. </P
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