Is there any way I can test the full capacity of tape with compression?
Arunav.
> Date: Tue, 4 Jan 2011 10:48:17 +0000
> From: a...@mssl.ucl.ac.uk
> To: di...@hotmail.com
> CC: bacula-users@lists.sourceforge.net
> Subject: Re: [Bacula-users] Bacula configration for FC LTO-5 tape drive
>
> Arunav Mandal wrote:
> > I have a Tandberg T40+ Tapeloader with HP LTO-5 tape drive connected to
> > "QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA" on a Dell
> > 2950 running Ubuntu Server 10.10. The kernel version is 2.6.35-24-server.
> > The autoloader device number changes sometimes with reboot. When I installed
> > the server it was /dev/sg4 and now it is /dev/sg2. The tape drive is at
> > /dev/st0 and /dev/nst0.
>
> the SG number depends entirely on the order things are picked up in. So
> does ST/NST for that matter. The trick there is to use a script to link
> each detecetd ST to a WWID entry and use that in bacula-sd.conf
>
> Bacula does use ST - more specifically it locks to whatever you have
> defined in bacula-sd - which means if you put an incorrect entry it will
> use it (GIGO)
>
> > My question is how can I fix the problem of device number changing with
> > reboots?
>
> Like this (from my configuration on RHEL5.5):
>
> bacula-sd.conf
>
> [snip]
> Device {
> Name = MSSLY8-0
> Drive Index = 0
> Device Type = Tape
> Media Type = LTO5
> AutoChanger = yes;
> Changer Device = /etc/bacula/DEVICES/MSSLY8-changer
> Archive Device = /etc/bacula/DEVICES/MSSLY8-0
> AutomaticMount = yes; # when device opened, read it
> AlwaysOpen = yes;
> LabelMedia = yes; # lets Bacula label unlabeled media
> RemovableMedia = yes;
> RandomAccess = no;
> Volume Poll Interval = 7200
> Alert Command = "sh -c '/usr/local/bin/gettapeinfo.sh
> /etc/bacula/DEVICES/MSSLY8-0'"
> Spool Directory = /var/bacula/spool/MSSLY8-0
> Maximum File Size = 10GB
> Maximum Network Buffer Size = 65536
> Maximum Spool Size = 250G
> Maximum Job Spool Size = 50G
> }
> [snip]
>
> The /etc/bacula/DEVICES entries are there simply for readability and are
> symlinks to the WWIDs of the tapes:
>
> # ls -l /etc/bacula/DEVICES
> total 0
> lrwxrwxrwx 1 root root 42 Nov 18 14:45 MSSLY8-0 ->
> /dev/tape/by-id/scsi-3500110a001313fee-nst
> lrwxrwxrwx 1 root root 42 Nov 18 14:45 MSSLY8-1 ->
> /dev/tape/by-id/scsi-3500110a0013141aa-nst
> lrwxrwxrwx 1 root root 42 Nov 18 14:45 MSSLY8-2 ->
> /dev/tape/by-id/scsi-3500110a001314b4a-nst
> lrwxrwxrwx 1 root root 42 Nov 18 14:42 MSSLY8-3 ->
> /dev/tape/by-id/scsi-3500110a001314b12-nst
> lrwxrwxrwx 1 root root 42 Nov 18 14:50 MSSLY8-4 ->
> /dev/tape/by-id/scsi-3500110a0013144e2-nst
> lrwxrwxrwx 1 root root 42 Nov 18 15:00 MSSLY8-5 ->
> /dev/tape/by-id/scsi-3500110a0013132b6-nst
> lrwxrwxrwx 1 root root 42 Nov 18 15:04 MSSLY8-6 ->
> /dev/tape/by-id/scsi-3500110a00131426e-nst
> lrwxrwxrwx 1 root root 38 Oct 29 20:47 MSSLY8-changer ->
> /dev/tape/by-id/scsi-200900d0710200002
>
> # ls -l /dev/tape/by-id/
> total 0
> lrwxrwxrwx 1 root root 10 Dec 23 19:15 scsi-200900d0710200002 -> ../../sg46
> lrwxrwxrwx 1 root root 10 Dec 23 19:15 scsi-3500110a0013132b6-nst ->
> ../../nst9
> lrwxrwxrwx 1 root root 10 Dec 23 19:14 scsi-3500110a001313fee-nst ->
> ../../nst4
> lrwxrwxrwx 1 root root 11 Dec 23 19:15 scsi-3500110a0013141aa-nst ->
> ../../nst11
> lrwxrwxrwx 1 root root 10 Dec 23 19:14 scsi-3500110a00131426e-nst ->
> ../../nst6
> lrwxrwxrwx 1 root root 10 Dec 23 19:14 scsi-3500110a0013144e2-nst ->
> ../../nst3
> lrwxrwxrwx 1 root root 11 Dec 23 19:15 scsi-3500110a001314b12-nst ->
> ../../nst10
> lrwxrwxrwx 1 root root 11 Dec 23 19:16 scsi-3500110a001314b4a-nst ->
> ../../nst13
>
> Note that only the SG of trhe changer is listed above. That's where
> /usr/local/bin/gettapeinfo.sh comes in to find the sg of individual tape
> drives for reporting purposes:
>
> ===
> #!/bin/bash
> export INDIRECT=`ls -l $1 | cut -f2 -d\>`
> export DEVICE=`ls -l $INDIRECT | cut -f2 -d\> | cut -f3 -d/`
> export GENERIC=`ls /sys/class/scsi_tape/$DEVICE/device | grep
> scsi_generic | cut -f2 -d:`
>
> echo $1 $INDIRECT $DEVICE $GENERIC
>
> tapeinfo -f /dev/$GENERIC
> smartctl -H -d scsi -l error /dev/$GENERIC
> ===
>
> Ideally RHEL's udev rules would put the sg entry in /dev/tape/by-id and
> I wouldn't have to kludge the script...
>
> NOTE: Linux multipathing does NOT support generic or tape devices, so be
> careful what you disconnect in a fibre network!
>
>
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