Backup Central

Unfortumately I cannot access the mail archive and censequently I cannot
find out whether the answer has already been given.

I have a DDS-3 DAT and it should eject as soon as a new tape is
requested and the new tape should be mounted automatically.

I have a configuration that does all this except that it does not read
the fresh tape correctly. The tape is correctly ejected and the drive is
then polled at intervals. The new tape is then actually detected but
then the storage daemon falls into a status 'Device "DDS-2" (/dev/nst0)
open but no Bacula volume is currently mounted.'. But it actually _is_ a
bacula volume and a simple mount in bconsole makes the job continue.

What is the correct combination of configurations to accomplish this -
if possible at all? I found some mails addressing versions 1.31 or 1.38
but I am using 2.0.3...

Best Regards,

Martin

This is my config:

Automatic Mount = yes; # when device opened, read it
Label Media = yes; # lets Bacula label unlabeled media
Always Open = no;
Volume Poll Interval = 5m
Close on Poll= Yes;
Removable Media = yes;
Random Access = no;
Maximum Open Wait = 3d # 3 days in seconds
Offline On Unmount = Yes; # keep this too

Martin Schmid wrote:
I have a DDS-3 DAT and it should eject as soon as a new tape is
requested and the new tape should be mounted automatically.

I have a configuration that does all this except that it does not read
the fresh tape correctly. The tape is correctly ejected and the drive is
then polled at intervals. The new tape is then actually detected but
then the storage daemon falls into a status 'Device "DDS-2" (/dev/nst0)
open but no Bacula volume is currently mounted.'. But it actually _is_ a
bacula volume and a simple mount in bconsole makes the job continue.

What is the correct combination of configurations to accomplish this -
if possible at all? I found some mails addressing versions 1.31 or 1.38
but I am using 2.0.3...


I have a similar config that works for me, with 1.38 I used it on a DDS4
drive, but now I'm using it with an LTO2.
This is my config:

Automatic Mount = yes; # when device opened, read it
Label Media = yes; # lets Bacula label unlabeled media
Always Open = no;
Volume Poll Interval = 5m
Close on Poll= Yes;
Removable Media = yes;
Random Access = no;
Maximum Open Wait = 3d # 3 days in seconds
Offline On Unmount = Yes; # keep this too


The only obvious difference I see with my config is that I have "Always
Open = Yes"--in case I've missed something, here is my device description:

Device {
Name = LTO2
Media Type = LTO2
Archive Device = /dev/nst0
Changer Device = /dev/sg0
Automatic Mount = Yes
Always Open = Yes
Volume Poll Interval = 3 min
Close On Poll = Yes
Offline On Unmount = Yes
Removable Media = Yes
Random Access = No
Maximum Job Spool Size = 21474836480
Maximum Block Size = 262144
Maximum Network Buffer Size = 262144
Spool Directory = /backup/bacula/spool
Alert Command = "sh -c 'smartctl -H -l error %c'"
Label Media = Yes
}

The block size and network buffer size settings should be completely
irrelevant--I did them to try to improve write performance (and at this
point it is unclear if it helps). I specify the changer device even
though I don't have a changer just to make the Alert Command work--or so
I recall--I don't actually have an LTO changer.

For me at least, this works as you suggest--if a tape is ejected either
during a job due to a full, error or wrong tape condition, then when the
correct tape is inserted it will just work. On the other hand, if I
explicitly unmount a tape, it will eject, but I'll have to explicitly
mount the correct tape later.

Hope this helps,

-se