AIX Version 4.3 Differences Guide

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LABEL:
TTY_RRB
IDENTIFIER: 1960E672
Date/Time: Fri Aug 28 14:54:41
Sequence Number: 20
Machine Id: 000044091C00
Node Id:
aix4xdev
Class:
O
Type:
INFO
Resource Name: Remote Reboot
Description
SYSTEM REBOOTED USING TTY REMOTE REBOOT.
User Causes
SYSTEM REBOOTED USING TTY REMOTE REBOOT.
Detail Data
TTY LOGICAL NAME
tty0
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The remote reboot function is intended to be used on remote server machines
that do not have a service processor. Ordinarily, the serial port with remote reboot
enabled would be connected to a modem to allow remote support staff to reboot
the machine if it fails to respond on the network in the normal manner.
It is the system administrators responsibility to provide physical security on any
serial port with remote reboot enabled. This is because any user can determine
the reboot string by using the lsattr command with the appropriate logical device
name. It is not possible to enable a password protected reboot string, as this
would require the code checking the password to use the crypt() function. Since
the code checking the string is running at the highest interrupt priority, any
increase in the time taken to service the interrupt may cause other device
interrupts to be lost with unpredictable results.
6.12 Network Install Manager Enhancements (4.3.2)
The Network Install Manager (NIM) subsystem has been enhanced in AIX 4.3.2
to offer greater control over NIM operations. The system has been changed to
allow more concurrent NIM operations and restrict the number of concurrent NIM
operations.
6.12.1 Restrict Concurrent Group Operations
A NIM machine group allows an administrator to use a single command to initiate
the same NIM action on many machines at the same time. Depending on the NIM
operation and numbers of machines involved, this can sometimes lead to
resource constraints. For example, many machines performing a BOS install
action could saturate a network segment.
Two new settings are available when performing NIM operations on group
resources. Together they allow the administrator to specify how many concurrent
operations should be attempted on machines in the group and for how long the
NIM server should continue to initiate the operations.
For example, this would allow the administrator of a NIM environment with a
machine group of 100 machines to initiate a NIM operation on the group and to
specify that no more than 10 machines in the group should have the operation in
progress at any one time. This ensures that the network bandwidth is not
System Management and Utilities 135