If I am reading a documentation to this package properly (not an easy
task as these docs may use a thorough rewrite) then /etc/rc.d/init.d/halt
script is missing shutdown procedures for UPS itself required when
such device is present (see 'shutodown.txt' in the said documentation).

I think that the following, inserted in 'halt' just before the last
line, would do:

switchoff_ups () {
    [ -r /etc/ups/upsmon.conf ] || return
    POWERDOWNFLAG=$( /bin/grep '^POWERDOWNFLAG' /etc/ups/upsmon.conf \
        | while read id pf rest ; do
            echo $pf
            break
        done )
    [ -f $POWERDOWNFLAG ] || return
    [ -f /etc/sysconfig/ups ] || return
    . /etc/sysconfig/ups
    [ "$SERVER" != "yes" -o "$MODEL" = "NONE" \
        -o "$MODEL" = "" -o "$DEVICE" = "" ] && return
    /usr/bin/$MODEL -k $DEVICE
}

[ "$command" = halt ] && switchoff_ups

if not for that small catch that /usr/bin may be already gone.
So either various ups drivers have to live in a place like /sbin
(actually they likely should be there) or 'halt' has to keep /usr/bin,
mounted read-only, to the last moment.

  Michal
  michal