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Why do my volumes mount so slowly?

Four factors cause long volume mount times:

1) The Volume Directory Tables are very large.

During the lifetime of a volume, files and directories are created and deleted. When a file is deleted, the contents of the file are not removed from the volume. These files are saved in a manner that allows for recovery. Periodically, system administrators should purge a volume of deleted files.

Purging a volume removes purgable files, but does not decrease the size of the directory tables. After a purge, a  volume is left with a large number of directory blocks that are empty. This does however, decrease the number of files that NetWare must process.

Solution:

The size of the Directory Tables needs to be reduced. Currently the only method to decrease the size of the Directory Tables is to backup the volume, delete the voume, recreate the volume and then restore the volume.

In a future release, we will add the capability to automatically reduce the Directory Table size.

2) The Directory Tables are scattered (fragmented) all over the volume.

This will increase the length of time that it takes NetWare to read the directory tables by a large amount.

Solution:

Use our Volume Defrag and perform a "Quick Defragment". This will defragment the Primary and Secondary Directory Tables.

3) The directory blocks within the directory tables were fragmented.

A directory block is 4KB in size and contains 32 file entries. Most NetWare volumes use a 64 KB block size. If a directory has more than 32 file entries, then additional directory blocks are allocated to a directory. On a typical system, the directory blocks are probably scattered around the directory tables and are not contiguous requiring multiple disk reads to process a directory. 

Solution:

Use our Volume Defrag and perform an "Defragment Directory Entries". This will sort the Directory Blocks within the Directory Tables requiring fewer disk reads and disk seeks to process a Directory Entry.

4) Not enough system memory.

If your system does not have enough free memory to hold both the primary and secondary tables in memory during a volume mount, then the same data may need to be moved into memory several times. 

Solution:

Either add more memory to your system, or reduce the size of the Directory Tables.

       
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Last modified: Tuesday March 14, 2006.