Unknown CD-ROM errors

Faris Raouf asterisk at raouf.net
Mon Sep 15 07:19:45 CDT 2008

Ah! I missed that. Thank you!

Mailing lists like this one are so useful.



From: Shyam_Iyer at Dell.com [mailto:Shyam_Iyer at Dell.com] 
Sent: 15 September 2008 11:02
To: asterisk at raouf.net; dyioulos at firstbhph.com;
linux-poweredge at lists.us.dell.com
Subject: RE: Unknown CD-ROM errors

Faris wrote:
>Disabling HALD (which I'm told is not useful on a server?) stopped the
messages from appearing in the logs, but it is unclear if the kernel is
still freezing or not or if the problem has gone away.

In your case it is worth disabling the media check by the workaround I
suggested Dimitri in the earlier mail.
Dimitri wrote:
>Well, the kernel is the most recent 2.4 version that appears in RHEL 3 and,
hence, CENTOS 3. I'd hate to think that I might have to do one of the two
work-arounds, but if I can't come up with another solution ... 
If leaving a CD in the drive causes the message to go away then we are on
the right track(as suggested by another gentleman in the list). If the error
stops getting logged then would like to rule out any other application
trying to check the media unless the scsi_errror thread is kicked in once in
a while.
After you have done the test of putting the media on the CD drive could you
try enabling the scsi loglevel on your system once without the CD media in
the drive and once with it. You should be able to see the scsi error thread
kicking in the log file.
Procedure to enable scsi logging- 
Append the following to /etc/sysctl.conf file -
Issue the following command to enable the loging -
# sysctl -p

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