From: hank@ducvax.auburn.edu
Subject: Re: Setting HPFS/FAT disk cache
Organization: Auburn University, AL
Date: Tue, 6 Oct 1992 00:01:27 GMT

In article <92Oct5.161818edt.42042@ois.db.toronto.edu>, panos@db.toronto.edu (Panos Economopoulos) writes:
> 
> I remember reading in one of the OS/2 help screens a section discussing,
> quite extensively, the suggested settings for the HPFS and the FAT disk cache.
> There was, also, a table with the suggested settings per amount of physical
> memory present.  I, recently, tried to find it again but I couldn't. 
> I am NOT referring to the IFS, HPFS, DISKCACHE entries of the Master Help

It's in the infoguide (probably avail in pub/os2/all/faq/ at ftp-os2.nmsu.edu):
                               OS/2 2.0
                    INFORMATION AND PLANNING GUIDE


                     Document Number G326-0160-00
[text deleted]
DEFAULT FILE SYSTEM CACHE SIZES

Although the installation defaults might not be specifically
customized to a particular system, it is beneficial to have access to
larger cache sizes.  Therefore, install OS/2 2.0 with larger cache
sizes when additional memory is available on the system.  Conversely,
reduce the cache size if there is less memory available on the system.

The default values are shown in Table 2.  If only the FAT file system
is installed, the default sizes are for the DISKCACHE= statement in
the CONFIG.SYS file.  If the system has partitions that are all HPFS,
the default size is for the IFS=HPFS statement in the CONFIG.SYS file.
If the system uses both file systems types, then OS/2 2.0 installation
changes the cache size for both file systems.  The file system with
the largest total amount of DASD (sum of the partitions) gets the
larger default value, as shown in Table 2.

+------------------------------------------------------------------------
| Table 2. Cache Sizes
+-------------------------+-------------------------+--------------------
|    MEMORY SIZE IN MB    |     TWO FILE SYSTEM     |     ONE FILE SYSTEM
+-------------------------+-------------------------+--------------------
|            4            |          128/64         |           128
+-------------------------+-------------------------+--------------------
|            5            |          128/64         |           128
+-------------------------+-------------------------+--------------------
|            6            |          256/64         |           256
+-------------------------+-------------------------+--------------------
|            7            |         256/128         |           256
+-------------------------+-------------------------+--------------------
|            8            |         256/256         |           384
+-------------------------+-------------------------+--------------------
|            9            |         256/256         |           384
+-------------------------+-------------------------+--------------------
|      10 through 16      |         512/512         |          1024
+-------------------------+-------------------------+--------------------
|      17 through 32      |        1024/1024        |          2048
+-------------------------+-------------------------+--------------------

--darrel hankerson hank@ducvax.auburn.edu