Kernel error on CD-RW/DVD ROM

[Alexander Dupuy]

Patti Clark wrote:
> the last message was generated right after I'd added space to an LVM partition.

This is a telling point.  I have a small snippet of shell code that will 
update /etc/lvm/lvm.conf to exclude CD/DVD-ROM/RW devices - I suspect 
that if you try running this on your machine (make a backup copy of 
/etc/lvm/lvm.conf first!), it will prevent these messages, at least if 
they are caused by LVM attempting to identify volumes.

# update lvm configuration to not bother trying to probe cdroms/cdwriters
FILTER=
for DEVICE in /dev/cd* /dev/dvd*
do
  case $DEVICE in *'*') : continue ;; esac
  FILTER="$FILTER \"r|$DEVICE|\","
  LINK=`readlink $DEVICE`
  case $LINK in
    '') : ;;
    /*) FILTER="$FILTER \"r|/$LINK|\"," ;;
    *) FILTER="$FILTER \"r|/dev/$LINK|\","
  esac
done
if [ -n "$FILTER" ]; then
  ed -s /etc/lvm/lvm.conf <<-EOF
/^ *filter =/s@=.*@= [$FILTER "a/.*/" ]@
wq
EOF
  rm -f /etc/lvm/.cache /etc/lvm/cache/.cache
fi

You could also just edit /etc/lvm/lvm.conf directly and set the filter 
patter manually - just remember to delete the cache file.

@alex