IBM 000-8697 Manual Do Utilizador

Installation and Initial Configuration

The logs contain critical information and should be located in mirrored
dbspaces, despite the fact that their high level of activity makes it costly (in
terms of performance) to do so.

Compare the total amount of dbspace disk space (exclude blobspaces) that
you intend to allocate to OnLine with the amount of space dedicated to
OnLine logging (physical log size plus total space allocated for the logical log
files). Ideally, logging space should be about 20 percent of total dbspace.
Adjust your worksheet values, if necessary.

(You should have values entered for all parameters on the worksheet except
for

ROOTOFFSET

 and

MIRROROFFSET

. Guidelines for these parameters are

described as part of the next topic.)

This section provides instructions for allocating raw disk space or cooked
files.

To allocate cooked file space, concatenate null to a pathname that represents
one chunk of cooked file space. The cooked disk space file should have
permissions set to 660 (rw-rw----). Group and owner must be set to informix.

# become root
su root
password:
# create file for the cooked device
cat /dev/null > chunk_pathname
# establish correct ownership
chown informix chunk_pathname
chgrp informix chunk_pathname
chmod 660 chunk_pathname
exit

If you are planning to locate your root dbspace in a cooked file, verify that the
pathname for the cooked file is the value of

ROOTPATH

on your configuration

worksheet.