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Novell eDirectory 8.8 Administration Guide
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The defaults for eDirectory 8.8 are listed below:
If the server you are installing eDirectory on does not have a replica, the default is a hard
memory limit of 16 MB, with 8 MB for block cache and 8 MB for entry cache.
For more information, refer to
“Understanding the Hard Memory Limit” on page 539
.
If the server contains a replica, the default is a dynamically adjusting limit of 51% of available
memory, with a minimum threshold of 8 MB and a maximum threshold of keeping 24 MB
available.
For more information, refer to
“Understanding the Dynamically Adjusting Limit” on page 538
.
18.1.1 Distributing Memory between Entry and Block Caches
With an entry cache and a block cache, the total available memory for caching is shared between the
two caches. The default is an equal division. To maintain the amount of block cache available in
earlier versions of NDS 8, you need to double the total cache size for eDirectory. If you use the
cache to boost LDIF-import performance, for example, you can either double the total cache size or
change the default cache settings. To change the default cache settings, refer to
“Configuring
Dynamically Adjusting and Hard Memory Limits” on page 539
.
The more blocks and entries that can be cached, the better the overall performance will be. The ideal
is to cache the entire database in both the entry and block caches, although this is not possible for
extremely large databases. Generally, you should try to get as close to a 1:1 ratio of block cache to
DIB Set as possible. For entry cache, you should try to get close to a 1:2 or 1:4 ratio. For the best
performance, exceed these ratios.
18.1.2 Using the Default Cache Settings
eDirectory provides two methods for controlling cache memory consumption: a dynamically
adjusting limit and a hard memory limit. You can use either method, but you cannot use them at the
same time because they are mutually exclusive. The last method used always replaces any prior
settings.
Understanding the Dynamically Adjusting Limit
The dynamically adjusting limit causes eDirectory to periodically adjust its memory consumption in
response to the ebb and flow of memory consumption by other processes. You specify the limit as a
percentage of available physical memory. Using this percentage, eDirectory recalculates a new
memory limit at fixed intervals. The new memory limit is the percentage of physical memory
available at the time.
Along with the percentage, you can set a maximum and minimum threshold. The threshold is the
number of bytes that eDirectory will adjust to. It can be set as either the number of bytes to use or
the number of bytes to leave available. The minimum threshold default is 16 MB. The maximum
threshold default is 4 GB.
If the minimum and maximum threshold limits are not compatible, the minimum threshold limit is
followed. For example, you could specify the following settings:
Minimum threshold:
8 MB
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