> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:bacula-users-
> [EMAIL PROTECTED] On Behalf Of Arno Lehmann
> Sent: Saturday, January 26, 2008 4:13 PM
> To: bacula-users@lists.sourceforge.net
> Subject: Re: [Bacula-users] Multiple TapeDrives but No Autochanger
>
> Hi,
>
> 25.01.2008 15:05, Christian Sabelmann wrote:
> > Hello, I try to get Bacula to work with 2 Tapedrives concurrently.
> > The goal is to use a pseudo changer or vitual autochanger, because a
> I
> > want every Job to use this device and also the same Pool.
> > This pseudo changer should be capable of choosing one free drive to
> > write, and if a volume is requested by bacula, then
> > it should not be important if the volume is inserted in the first or
> the
> > second tape drive, unless the drive is already writing for another
> Job.
> >
> > I been looking old mails and found that there are other people having
> > the same problem. There is a script written by "Mario Wolff
> > " which can be found in the mail archive. 28/JAN/2005.
>
> Good. I was about to point you to it :-)
>
> > I tried this out but it did not work because the pseudo changer using
> > /dev/null as Changer is not recognized by Bacula
> > (VER. 2.2.6)
> >
> > Have anyone tried out some script like this to manage this problem?
> did
> > it work? or do you have some Ideas how to make it work?
>
> Disclaimer: I have never personally used that approach...
>
> But I'm pretty sure that with some changes in Bacula since 2005, the
> script would need some work done. Mainly because Baculas way to select
> drives has been refined a lot, though this shouldn't matter in a
> situation where there exists only one device known to it.
>
> Regarding your current problem, I'd try using any /dev/sgX (linux
> terminology) device as the cahnger device in the configuration (though
> I don't see why /dev/null wouldn't work). You're not actually using
> this device, so no harm will be done.
>
> Currently, as I hevent't looked at Marios script in ages, I would
> suggest you read it carefully to understand how it's doing its work,
> and where things might fail. As stated above, I would expect some
> modifications to be required.
>
> Hope this helps,
>
> Arno
>
> >
> >
>
> --
> Arno Lehmann
> IT-Service Lehmann
> www.its-lehmann.de
>
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I was looking for a solution to this problem about 6 months ago and was able to
find a successful solution using the Mario Wolff script with some
modifications. The original script by Mario is included in the source in the
file examples/autochangers/multiple-drive-changer.txt.
Mario's script needed some modification to work properly for me (I assume it is
differences between Bacula 1.x and Bacula 2.x). These modifications allow
Bacula to think it is dealing with a 2 slot autochanger with 1 drive which
allows my backup jobs to span multiple tapes without having an actual
autochanger. The "slots" are actually the tape drives and the script uses a
soft link called /dev/tape to point at the physical drive that it wants to use.
In my setup, I am keeping the "slot inventory" in files inside
/etc/bacula/tapelabel/ called SLOT01 and SLOT02.
Below are my Bacula conf files and a copy of my modified script (most of the
script is written by Mario Wolff, just some minor changes mainly with the exit
codes). Let me know if you have any questions. I have been using this
successfully for about 4 months and it works great.
Bacula-sd.conf:
Device {
Name = Multitape-drive
Media Type = LTO2
Archive Device = /dev/tape
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
Autochanger = yes
}
Autochanger {
Name = Multitape-changer
Device = Multitape-drive
Changer Command = "/etc/bacula/scripts/multitape-changer %c %o %S %a %d"
Changer Device = /dev/null
}
Bacula-dir.conf:
Storage {
Name = LTO2-1
Address = backup01 # N.B. Use a fully qualified name here
SDPort = 9103
Password = "*"
Device = Multitape-changer
Autochanger = yes
Media Type = LTO2
}
Script multitape-changer:
#!/bin/bash
#
# Bacula interface to use multiple drives as one tape-changer
# Arguments are copied from the mtx-script! Simply exchange
# the scriptname from demo-config
#
# If you set in your Device resource
#
# Changer Command = "path-to-this-script/multitape-changer %c %o %S %a %d"
# you will have the following input to this script:
#
# multitape-changer "changer-device" "command" "slot" "archive-device"
"drive-index"
# $1 $2 $3 $4 $5
#
# for example:
#
# multitape-changer /dev/sg0 load 1 /dev/nst0 0 (on a Linux system)
#
# Setup arguments
cmd="$2"
slot=$3
DEVICE=${4:-/dev/tape}
LABELDIR=/etc/bacula/tapelabel # where to find labelfiles
NULLDEVICE=/dev/null # if unmount link to this
SLOT01=/dev/nst0 # first slot
SLOT02=/dev/nst1 # second slot
# simply append more
#get device for a given slotnumber
getdevice(){
myslot=${1:-1}
if [ ${#myslot} -gt 2 ];then exit 1;fi
if [ ${#myslot} -eq 2 ];then
eval echo \$SLOT$myslot
return
else
eval echo \$SLOT0$myslot
return
fi
}
#get name of labelfile for a given slot
getname(){
myslot=${1:-1}
if [ ${#myslot} -gt 2 ];then exit 2;fi
if [ ${#myslot} -eq 2 ];then
echo SLOT$myslot
return
else
echo SLOT0$myslot
return
fi
}
#how many tapes/slots to manage
getslots(){
count=1
while [ "$( getdevice $count )" ];do
count=$[ $count + 1 ]
done
echo $[ $count - 1 ]
return
}
#get slot for a given device-file
getslot(){
device=${1:-$NULLDEVICE}
if [ "$device" = "$NULLDEVICE" ];then
echo -en "0\n"
return
else
count=1
slotdev=$( getdevice $count )
while [ "$slotdev" ]; do
if [ "$slotdev" = "$device" ];then
echo -en "$count\n"
return
fi
count=$[ $count + 1 ]
slotdev=$( getdevice $count )
done
# exit 3
fi
}
if test $# -lt 2 ; then
echo "usage: multitape-changer ctl-device command slot archive-device drive"
echo " Insufficient number of arguments arguments given."
echo " Mimimum usage is first two arguments ..."
exit 4
fi
#
# Check for special cases where only 2 arguments are needed,
# all others are a minimum of 3
case $cmd in
loaded)
;;
unload)
;;
list)
;;
slots)
;;
*)
if test $# -lt 3; then
echo "usage: multitape-changer ctl-device command slot archive-device
drive"
echo " Insufficient number of arguments arguments given."
echo " Mimimum usage is first three arguments ..."
exit 5
fi
;;
esac
case $cmd in
unload)
if [ -e $DEVICE ];then
rm $DEVICE && ln -s $NULLDEVICE $DEVICE || exit 0
else
ln -s $NULLDEVICE $DEVICE || exit 0
fi
;;
load)
CURDEV=$( getdevice $slot )
if [ -e $DEVICE ];then
rm $DEVICE && ln -s $CURDEV $DEVICE || exit 0
else
ln -s $CURDEV $DEVICE || exit 0
fi
;;
list)
slots=$( getslots )
for slot in $( seq 1 $slots );do
labelfile=$LABELDIR/$( getname $slot )
if [ -f "$labelfile" ];then
echo "$slot:$( head -n 1 $labelfile)"
else
echo "$slot:"
fi
done
exit 0
;;
loaded)
if [ -e $DEVICE ];then
line=$( ls -la $DEVICE )
fi
line=${line:-$NULLDEVICE}
getslot ${line##* }
sleep 1
exit 0
;;
slots)
getslots
exit 0
;;
esac
Bob Duman
Senior Systems Engineer
Cleantech Group LLC
http://www.cleantech.com
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