Recovery from an LED 553 in AIX Versions 5 and 6

Technote (FAQ)

Question
Recovery from an LED 553 in AIX Versions 5 and 6

Answer
This document describes a procedure to attempt to recover from an IPL hang at LED 553. It applies to AIX Versions 5 and 6.
About LED 553
An LED value of 553 is a checkpoint code displayed to indicate the system transition to phase 3 of IPL. A halt or hang at LED 553 is often the result of a corrupted or missing /etc/inittab file. It can also be caused by full / (root) or /tmp file systems, inconsistencies in either startup configuration files, Object Data Manager (ODM) object class databases, or system library files. Additionally, a number of other issues involving file permissions, invalid hard links in the root file system, etc. have been observed to cause a hang at LED 553.

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How much memory is in this UNIX/Linux machine?

How much memory is in this machine?

It would seem that answering this question ought to be easy; it is - but every system has the answer in a different place. Most put an answer of some sort into kernel messages reported by dmesg (AIX apparently does not).

Most systems have a program for system inventory which reports a variety of things, including memory.

Rather than go into great detail about each one, we’ll just put these out there for all of you to reference. Each environment has multiple commands that give available memory; each command is listed below.

Without further ado, here are a few answers to this burning question:

Solaris

1. dmesg grep mem


2. prtdiag grep Memory


3. prtconf -v grep Memory

AIX

1. bootinfo -r


2. lsattr -E1 sys0 -a realmem


3. getconf REAL_MEMORY

HPUX

1. dmesg grep Physical


2. /opt/ignite/bin/print_manifest grep Memory


3. machinfo grep Memory

Linux

1. dmesg grep Memory


2. grep -i memtotal /proc/meminfo


3. free

OpenVMS

1. show mem /page

Update:

FreeBSD

1. dmesg grep memory


2. grep memory /var/run/dmesg.boot


3. sysctl -a grep mem