Assessing logical volume fragmentation with the lslv command

The lslv command shows, among other information, the logical volume fragmentation.

To check logical volume fragmentation, use the command lslv -l lvname, as follows:

# lslv -l hd2
hd2:/usr
PV                COPIES        IN BAND       DISTRIBUTION
hdisk0            114:000:000   22%           000:042:026:000:046

The output of COPIES shows the logical volume hd2 has only one copy. The IN BAND shows how well the intrapolicy, an attribute of logical volumes, is followed. The higher the percentage, the better the allocation efficiency. Each logical volume has its own intrapolicy. If the operating system cannot meet this requirement, it chooses the best way to meet the requirements. In our example, there are a total of 114 logical partitions (LP); 42 LPs are located on middle, 26 LPs on center, and 46 LPs on inner-edge. Since the logical volume intrapolicy is center, the in-band is 22 percent (26 / (42+26+46). The DISTRIBUTION shows how the physical partitions are placed in each part of the intrapolicy; that is:

edge : middle : center : inner-middle : inner-edge

See Position on physical volume for additional information about physical partitions placement.