Installation guide

This situation occurs because the original vmcore. n file contains UNIX
File System (UFS) file holes, which are regions that have no associated
data blocks. When a process, such as the gunzip or uncompress command
reads from a hole in a file, the file system returns zero-valued data. Thus,
memory omitted from the partial dump is added back into the
uncompressed vmcore.
n file as disk blocks containing all zeros.
To ensure that the uncompressed core file remains at its partial dump size,
you must pipe the output from the gunzip or uncompress command with
the -c flag to the dd command with the conv=sparse option. For example,
to uncompress a file named vmcore.0.Z, issue the following command:
# uncompress -c vmcore.0.Z | dd of=vmcore.0 conv=sparse
262144+0 records in
262144+0 records out
13.7 Environmental Monitoring
On any system, thermal levels can increase because of poor ventilation,
overheating conditions, or fan failure. Without detection, an unscheduled
shutdown could ensue causing the system’s loss of data or damage to the
system itself. By using Environmental Monitoring, the thermal state of
AlphaServer systems can be detected and users can be alerted in time
enough to recover or perform an orderly shutdown of the system.
This chapter discusses how Environmental Monitoring is implemented on
AlphaServer systems.
13.7.1 Environmental Monitoring Framework
The Environmental Monitoring framework consists of four components:
loadable kernel module and its associated APIs, Server System MIB
subagent daemon, the envmond daemon, and the envconfig utility.
13.7.1.1 Loadable Kernel Module
The loadable kernel module and its associated APIs contain the parameters
needed to monitor and return status on your system’s threshold levels. The
kernel module exports server management attributes as described in
Section 13.7.1.1.1 through the kernel configuration manager (CFG)
interface only. It works across all platforms that support server
management, and provides compatibility for other server management
systems under development. The kernel module is supported on all Alpha
systems running Version 4.0A or higher of the Tru64 UNIX operating
system.
Administering Events and Errors 13–25