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
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