1-50 IBM Informix OnLine Database Server Administrator’s Guide

Configuration Checklist

Configuration Checklist
Figure1-3 is a checklist to help you verify that you have correctly completed
the initialization preparation tasks.
Figure1-3
Checklist to
verify that the
preparation
tasks for OnLine
initialization
have been
completed
correctly
✔ Create user and group informix
The only member of the groupinformix is user informix. Perform OnLine
administrative actions as userinformix.
✔ Create raw devices
Do not mount raw devices. Raw devices should not include file systems.
✔ Set device permissions
Each raw device should displayinformix as its group and owner. Permissions
on each raw device are set to 660 (crw-rw----).
✔ Verify UNIX kernel parameters
The recommendations for UNIX kernel parameters included in the machine-
specific ONLINE_5.x file are compatible with your current UNIX kernel
parameters.
✔ Verify chunk offsets, if needed
Ifyour system uses track 0 for control information and if the root dbspace or its
mirror is at the start of a partition, check that you included an offset into the
device.
✔ Verify size of root dbspace
Check that the initial chunk of the root dbspace is large enough to contain the
physical log, all logical logs, and OnLine overhead requirements.
✔ Verify OnLine shared-memory size
Checkthat thesizeyou selectedforOnLine sharedmemoryfits withinthe amount
of shared memory available on your UNIX machine.