General hints

The MMOVPCT keyword is recommended over MAXMOVE when running DEFRAG on an extended address volume.
To have the DEFRAG function perform in the shortest period of time, or to create the largest single freespace extent, perform only the first pass. Do so by coding the MAXMOVE(n) parameter using a very high value for n, or code the MMOVPCT(n) parameter using a high percentage amount. When the value is higher than what the DEFRAG function can assemble, the process stops at the end of the first pass. For example:
```
DEFRAG DYNAM(388002) MAXMOVE(9999)
```
or
```
DEFRAG DYNAM(388002) MMOVPCT(75)
```
Experimenting with the DEFRAG FRAGI and MAXMOVE or MMOVPCT parameters will allow you to compare results when you use DASD with different fragmentation characteristics. The fragmentation index that can be specified by the DEFRAG options represents a number between 0 and 1 and can be one to three digits long. FRAGI(333) represents 0.333 and FRAGI(3) represents 0.3. By default, MAXMOVE or MMOVPCT use FRAGI(3), which is the recommended value. To defragment DASD volume 388001, you can use the command, as follows:
```
DEFRAG DYNAM(388001) FRAGI(3)
```