The lvextend command changes either the number of logical extents allocated to a logical volume specified with the LogicalVolumePath parameter or the number of physical extents allocated to each logical extent in the logical volume. The change is determined according to which command flags you use.
LogicalExtentsNumber represents the new total number of logical extents that can be allocated to LogicalVolumePath. The change is accomplished by allocating the number of additional logical extents represented by the difference between LogicalExtentsNumber and the previous number of extents.
The mirror policy and mirror copies number for the new logical extents is the same as previously established for the LogicalVolumePath.
Either this option or the -m option must be supplied. Sets the number of physical extents allocated for each logical extent.
MirrorCopies (that is, mirrors) can be either 1 or 2. This means that beyond the original copy, one or two mirror copies will contain the same data as the original copy. MirrorCopies must be greater than the current number of mirrors for the logical volume.
The data in the new copies are synchronized. The synchronization process can be time consuming, depending on the hardware characteristics and the amount of data. If the allocation policy for the logical volume is strict and the specified physical volume already contains logical extents of the logical volume, the request is rejected.
Either this option or the -l option must be supplied.
Commands: lvcreate(8), lvdisplay(8), lvreduce(8), pvchange(8), pvdisplay(8) delim off