User Guide

234 Utilities Reference
Utilities Reference
103-000153-001
August 29, 2001
Novell Confidential
Manual 99a38 July 17, 2001
Minimum File Cache Buffers =
number
Set the minimum number of cache buffers the operating system
can allow for file caching.
Supported values: 20 to 1000
Default: 20
All memory not allocated for other processes is given to disk
cache memory to use for file and directory caching. As memory is
requested for other processes, the server gives up cache buffers.
This limit specifies when the server must stop giving file cache
buffers to other processes.
If you set the minimum too high, other processes might not be
able to allocate necessary memory resources.
For example, a module could fail to load because the server is out
of available memory.
Maximum Concurrent Disk Cache
Writes = number
Specify the number of write requests for changed file data that
can be put in the elevator before the disk head begins a sweep
across the disk.
Supported values: 10 to 4000
Default: 50
A high number creates more efficient write requests. A low
number creates more efficient read requests.
Monitor the number of Dirty Cache Buffers displayed on the
Cache Utilization Statistics screen in MONITOR.
If this number is above 70 percent of total cache buffers, optimize
the write speed by increasing this parameter.
Dirty Disk Cache Delay Time = time Specify how long the system keeps a write request (that does not
fill a cache buffer) in memory before writing the request to disk.
Supported values: 0.1 second to 10 seconds
Default: 3.3 seconds
Increasing the time makes disk writing more efficient if your users
make many small write requests.
Decreasing the time can reduce performance drastically, and
reduces the chances of losing data only slightly.
Parameter Use to