Hello Phil,
There should be no difference in how Bacula handles tapes between 7.4.7
and 9.0.x. If there is I would suggest that you carefully document it
in a way that I can "see" the problem and easily reproduce it so that I
can fix it. mtx-changer will *not* work unless you have an
autochanger. There is no fake autochanger for tapes. There are two
types of "fake" autochangers for Disks. The first one is something like
mhvtl that is a program that simulates in detail and autochanger. The
second is the Bacula virtual disk autochanger.
If you have a real stand-alone tape drive, I personally know of no way
to make it work with mtx, and if Bacula does not work with it, I will be
happy to work on fixing it, but only if it is clearly documented in a
detailed but very concise way.
The Bacula virtual disk autochanger and certain other cases are very
nicely documented in several of the white papers that are on www.bacula.org.
Best regards,
Kern
On 08/01/2017 08:44 PM, Phil Stracchino wrote:
I've just upgraded from Bacula 7.4.7, in which my standalone LTO4 tape
drive worked perfectly, to Bacula 9.0.2, in which it doesn't. In 9.0.2,
I had to use the workaround of setting up a fake autochanger with one drive.
The problem is that this trick is not documented, and I had to largely
figure it out by trial and error and reference to outdated documentation
that doesn't address the fake-autochanger case anyway. The mtx-changer
command is just copied directly from a standard changer invocation, and
Changer Device is a total guess - it's the generic SCSI device
corresponding to the tape drive. I don't know if it's right, wrong, or
unneeded, or what to use in its place. I also don't know whether any of
the directives in the Device description are obsolete or not needed any
more.
Here's the configuration in my Director:
Storage {
Name = babylon5-sd
Address = babylon5.babcom.com
SDPort = 9103
Password = "********************"
Device = babylon5-changer
Media Type = LTO-4
Maximum Concurrent Jobs = 20
Autochanger = yes
}
And on the relevant Storage:
Autochanger {
Name = babylon5-changer
Device = LTO-4
Changer Command = "/usr/libexec/bacula/mtx-changer %c %o %S %a %d"
Changer Device = /dev/sg5 # this is largely a guess
}
Device {
Name = LTO-4
Media Type = LTO-4
Archive Device = /dev/nst0
Drive Index = 0 # pretend
Autochanger = yes # pretend
AutomaticMount = yes # when device opened, read it
AlwaysOpen = yes
OfflineOnUnmount = yes
RemovableMedia = yes
RandomAccess = no
Maximum File Size = 5GB
Maximum Block Size = 2048000
Spool Directory = /var/tmp/bacula
Maximum Spool Size = 10GB
Maximum Job Spool Size = 5GB
}
Now, this *WORKS.* But it throws non-fatal mtx-changer errors like this:
01-Aug 14:11 minbar-dir JobId 14328: BeforeJob: Client babylon5 has address
+10.24.32.10
01-Aug 14:11 minbar-dir JobId 14328: Start Backup JobId 14328,
+Job=Babylon5_Backup.2017-08-01_14.11.23_04
01-Aug 14:11 minbar-dir JobId 14328: Using Device "LTO-4" to write.
01-Aug 14:11 babylon5-sd JobId 14328: No slot defined in catalog
(slot=0) for Volume
+"LTO4-FULL-0024" on "LTO-4" (/dev/nst0).
01-Aug 14:11 babylon5-sd JobId 14328: Cartridge change or "update slots"
may be
+required.
01-Aug 14:11 babylon5-sd JobId 14328: 3991 Bad autochanger "loaded? drive 0"
+command: ERR=Child exited with code 1.
Results=mtx: Request Sense: Long Report=yes
mtx: Request Sense: Valid Residual=no
mtx: Request Sense: Error Code=70 (Current)
mtx: Request Sense: Sense Key=Illegal Request
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Additional Sense Code = 20
mtx: Request Sense: Additional Sense Qualifier = 00
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
READ ELEMENT STATUS Command Failed
01-Aug 14:11 babylon5-sd JobId 14328: Recycled volume "LTO4-FULL-0007"
on Tape
+device "LTO-4" (/dev/nst0), all previous data lost.
I get similar errors from mounting and unmounting volumes. Clearly
mtx-changer is really not on board with this whole "fake autochanger'
thing. Does anyone know what changes I should make to eliminate these
errors? Is there a specific way to configure mtx-changer for the "fake
autochanger" case? Should I be even using a Changer Command at all if
there is no Changer?
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