Raritan CCA-0N-V5.1-E, Руководство администратора

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Prior to version 4.0, CC-SG Diagnostic Console displays a number of
messages on the screen each time when it boots up. These messages
are standard Linux diagnostic and warning messages and usually do not
imply any system problems. The table offers a short introduction to a few
frequent messages.
Message Description
hda: The message indicates that something on the system is trying
to communicate with the DVD-ROM drive. Different scenarios
can invoke the message. For example:

A user opens or closes the DVD-ROM drive door, or

The operating system is checking the DVD-ROM drive and
finds no media when it boots up.
There are other scenarios that invoke the message as well but
will not be described in the section.
avc: The message comes from an internal security audit and control
system -- SELinux sub-system. The system issues warnings
without enforcing any security policy so they do not indicate any
problem with the system.
ipcontracks: The message always appears each time CC-SG boots up so it
is normal.
Note that CC-SG turns off these messages since version 4.0, but they
are still available in internal logs. Therefore, when you upgrade CC-SG
from 3.x to 4.x, these Diagnostic Console messages disappear.
Appendix L
Diagnostic Console Bootup
Messages