Control Data 3170 Installation Handbook page 283

9.2.3 ALTERING OCAREM fiLES
The user may alter the size of the OCAREM files through the PRELIB routine (section
7.2. 3). Care must be taken to ensure the following.
Only the proper file ordinals are used when referring to the OCAREM files. The
file ordinals are:
MSDFILE 64
IDFILE 65
LABELFILE 66
The maximum file count (MFC) of the system is determined by the capacity of the
IDFILE and the LABELFILE. The smallest one in capacity determines the MFC. The
maximum segment count (MSC) is determined by the block size of the LABELFILE
which is an installation option set by the IUP. Both of the values (MFC and MSC) are
calculated and placed in the resident parameter table (RPT) in CIO by INITIAL at auto-
load time.
Example:
If MSOS was installed with MFC
=
160 and MSC
files would be of the following size.
26 on an 854 system, the FLD
LABELFILE
IDFILE
20 tracks
2 tracks
The CIO values would be:
MFC 160
MSC 26
If the user needs the capability of 480 files, he must add space for 320 files.
On an
854 the FLD files require the following.
LABELFILE
IDFILE
60 tracks
6 tracks
PRELIB is used to expand the system OCAREM files. Refer to section 8.2. 3 for use of the
~EXP AND control card within PRELIB.
III-9-18
NOTE
The MSC can only be set during an instal-
lation. It determines the block size of the
FLD for the life of the system.
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