User Guide

Optimizing Server Memory 23
Server Memory Administration Guide
103-000147-001
August 30, 2001
Novell Confidential
Manual 99a38 July 17, 2001
3
Based on the observations you made of the server's resource utilization
and LRU Sitting Time, determine an average low LRU Sitting Time.
4 Tune the cache. Size the cache in such a way that the server can sustain
an average low LRU Sitting Time of at least 12 minutes during peak
workloads.
For example, if your server's original average low LRU was 7 minutes,
you will need to add enough memory to increase the LRU Sitting Time to
an average low of 12 minutes during peak workloads. This added memory
increases the likelihood that repeatedly used data will still be cached
when the next user request is received.
On the other hand, if the server's original lowest LRU sitting time was 18
minutes, the server has more than adequate cache. You can leave the
excess memory in the server for future growth or remove it and use it
somewhere else.
Setting a File Cache Buffer Alert
You can control when the server alerts you to serious decreases in the number
of available file cache buffers. Use the following SET parameters (Traditional
File System category).
 Minimum File Cache Buffers establishes the minimum number of
buffers that will always be reserved for file cache and not made available
for other processes. When this minimum is reached, the server displays
the message Cache memory allocator exceeded minimum.
 Minimum File Cache Report Threshold instructs the server to send an
alert before the minimum number of file cache buffers is reached. Set this
parameter to the number of buffers above the minimum at which you
want the server to send an alert. For example, if the Minimum File Cache
Buffers value is 20 and the Minimum File Cache Report Threshold value
is 30, the server sends an alert when 50 file cache buffers are left.
eDirectory
If you suspect that your server is slow in accessing eDirectory
TM
, see
Improving eDirectory Performance in the Novell eDirectory 8.6
Administration Guide.