Diskeeper 10 User's Manual

22 Diskeeper Operation
• Overall fragmentation
• MFT fragmentation
• Paging file fragmentation
• Available free space
Diskeeper uses these factors to determine a volume health index each time it analyzes or defragments a volume.
Volume health is rated into three categories—Healthy, Warning and Critical.
This table shows the Warning and Critical levels used in determining the reliability index.
Reliability Factor Warning Level Critical Level
Overall Fragmentation > 10% fragmentation > 50% fragmentation
MFT Fragmentation > 250 fragments >2000 fragments
Paging File Fragmentation > 250 fragments >1500 fragments
Free Space < 15% free space < 5% free space
I-FAAST Statistics Section
Displayed only on Diskeeper editions that include the Intelligent File Access Acceleration Sequencing
Technology (I-FAAST) feature, this section of the Job Report tab provides statistical information about I-
FAAST Defragmentation Jobs and the related performance improvement. The values shown in this section are
based on measurements taken during I-FAAST processing, and they show the potential performance gain you
can expect from the selected volume, as well as the actual measured throughput rates for the volume.
The actual performance gain from using I-FAAST will fluctuate depending volume activity, but the statistics
shown in this section of the Job Report tab give you an indication of the improvement you can expect to see.
Access Time Section
This section of the Job Report tab displays a graph illustrating the performance characteristics of the volume,
based on current read times calculated by Diskeeper—both for all the files on the drive and for only the
fragmented files on the volume. It also shows the expected optimum read time for all the files and for only the
fragmented files. This gives you a detailed picture of your performance losses due to fragmentation, and the
expected improvement you will see after defragmentation.
Each time you analyze or defragment a disk, Diskeeper calculates the read time of the disk in two ways. First, it
shows the predicted time to read all the files on the disk. Secondly, it shows the time to read only the
fragmented files. Additionally, it determines the optimum (fastest) read time potential for the disk.
It should be noted that by default, the performance analysis is based on pre-determined disk performance values
measured as a part of disk performance research done by Diskeeper Corporation. To get a more accurate
performance measurement of your actual disks, Diskeeper must scan your drives to measure their performance.
Since this measurement can briefly slow down your computer, this scan operation is disabled by default, but
you can turn it on easily. The Enable volume performance data collection option is described in the
Diskeeper Configuration Properties section on page 49.
Statistics Section
This section of the Job Report tab shows useful information about your volume after either analysis or
defragmentation. Note that most of the information shown here can also be recorded in the Diskeeper Event
Log.