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Reasons you may need to defragment your NetWare volume:

1) A volume segment was added to an existing volume.

If a volume segment is added to an existing NetWare volume after data has already been written to the volume, the balance of data between the volume segments is mismatched. The original volume segment will contain all of the volume data with the new segment(s) containing no data. The advantages of NetWare's volume segment striping will be lost.

Defragmenting this volume will evenly distribute data across the volume segments restoring the performance advantages of Novell's volume striping.

2) A volume was resized by a resizing utility.

When a volume is resized, data needs to be moved to make room for the expanded FAT tables. Unless the resize utility also defragments the important tables when resizing, several tables will be written in random locations impacting volume performance.

Performing a "Quick Defragment" of a NetWare volume will ensure that the most important data table, the Primary and Secondary Directory Tables, are written to optimized locations.

Beginning with our Volume Resize Utility for NetWare version 1.27, we have added an automatic "Quick Defragment" when resizing a NetWare volume.

3) When mounting a volume, you hear a lot of disk chatter.

When NetWare mounts a volume, it reads several data tables into memory either completely or partially to implement caching. If these tables are scattered across a volume, the amount of time to read these tables increases significantly. In addition, the rapid head movement increases drive temperatures.

The primary reason for long mount times is the Primary and Secondary Directory Tables. These tables grow dynamically as needed. The Directory Tables consist of a number of 4 KB blocks which can be located anywhere within a volume. If these blocks are not consecutive, performance descreases.

Performing a "Quick Defragment" of a NetWare volume will ensure that the most important data table, the Primary and Secondary Directory Tables, are written to optimized locations.

     
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Last modified: Tuesday March 14, 2006.