6.1. When to add a segment manager
Adding a segment manager to a disk allows the disk to be subdivided into
smaller storage objects called disk segments. The
add command causes a
segment manager to create appropriate metadata and expose freespace
that the segment manager
finds on the disk. You need to add segment managers when you
have a new disk or
when you are switching from one partitioning scheme to another.
EVMS displays disk segments as the following types:
Data: a set of contiguous sectors that has been allocated
from a disk and can be used to construct a volume or object.
Freespace: a set of contiguous sectors that are unallocated
or not in use. Freespace can be used to create a segment.
Metadata: a set of contiguous sectors that contain
information needed by the segment manager.
