I'm having a bit of trouble understanding what is causing the below two
jobs to fail. Job 25915 is a virtual full backup, job 25919 is a normal
full backup. Both jobs are writing to a two drive autochanger. The
virtual full job is writing to drive 0 and reading from drive 1. The
normal full wants to write to drive 1, but since drive 1 is in use when
it starts it blocks waiting for the drive to become available. That is
as I would expect, but when the the virtual full unloads drive 1 to load
the next needed volume, the normal full job wakes up and decides to load
drive 1 with the volume it wants to use at the same time the virtual
full job is loading its next tape. This I do not expect, particularly
since the two drives both have MaximumConcurrentJobs = 1 in
bacula-sd.conf. Am I missing something, or is this a potential race
condition bug?
#==== excerpt from log for job 25915
03-Jan 17:04 s3-dir JobId 25915: Start Virtual Backup JobId 25915,
Job=josh.2012-01-03_17.04.27_54
03-Jan 17:04 s3-dir JobId 25915: Bootstrap records written to
/var/spool/bacula/s3-dir.restore.17.bsr
03-Jan 17:05 s3-dir JobId 25915: Recycled volume "vchanger1_0004_0017"
03-Jan 17:05 s3-dir JobId 25915: Using Volume "vchanger1_0004_0017" from
'Scratch' pool.
03-Jan 17:05 s3-dir JobId 25915: Using Device "usb-changer-1-drive-0"
03-Jan 17:05 s3-sd JobId 25915: 3307 Issuing autochanger "unload slot 116,
drive 1" command.
03-Jan 17:05 s3-sd JobId 25915: 3304 Issuing autochanger "load slot 189, drive
1" command.
03-Jan 17:05 s3-sd JobId 25915: 3305 Autochanger "load slot 189, drive 1",
status is OK.
03-Jan 17:05 s3-sd JobId 25915: Ready to read from volume "vchanger1_0005_0039"
on device "usb-changer-1-drive-1" (/var/spool/bacula/vchanger1/1/drive1).
03-Jan 17:05 s3-sd JobId 25915: 3307 Issuing autochanger "unload slot 33, drive
0" command.
03-Jan 17:05 s3-sd JobId 25915: 3304 Issuing autochanger "load slot 117, drive
0" command.
03-Jan 17:05 s3-sd JobId 25915: 3305 Autochanger "load slot 117, drive 0",
status is OK.
03-Jan 17:05 s3-sd JobId 25915: Recycled volume "vchanger1_0004_0017" on device
"usb-changer-1-drive-0" (/var/spool/bacula/vchanger1/0/drive0), all previous
data lost.
03-Jan 17:05 s3-dir JobId 25915: Max Volume jobs=1 exceeded. Marking Volume
"vchanger1_0004_0017" as Used.
03-Jan 17:05 s3-sd JobId 25915: Forward spacing Volume "vchanger1_0005_0039"
tofile:block 0:213.
03-Jan 17:30 s3-sd JobId 25915: End of Volume at file 5 on device
"usb-changer-1-drive-1" (/var/spool/bacula/vchanger1/1/drive1), Volume
"vchanger1_0005_0039"
03-Jan 17:30 s3-sd JobId 25915: 3307 Issuing autochanger "unload slot 189,
drive 1" command.
03-Jan 17:30 s3-sd JobId 25915: 3304 Issuing autochanger "load slot 27, drive
1" command.
03-Jan 17:30 s3-sd JobId 25915: 3305 Autochanger "load slot 27, drive 1",
status is OK.
03-Jan 17:30 s3-sd JobId 25915: Ready to read from volume "vchanger1_0003_0027"
on device "usb-changer-1-drive-1" (/var/spool/bacula/vchanger1/1/drive1).
03-Jan 17:30 s3-sd JobId 25915: Forward spacing Volume "vchanger1_0003_0027"
tofile:block 0:209.
03-Jan 17:30 s3-sd JobId 25915: End of Volume at file 0 on device
"usb-changer-1-drive-1" (/var/spool/bacula/vchanger1/1/drive1), Volume
"vchanger1_0003_0027"
03-Jan 17:30 s3-sd JobId 25915: Fatal error: acquire.c:72 Acquire read:
num_writers=1 not zero. Job 25915 canceled.
03-Jan 17:30 s3-sd JobId 25915: Fatal error: mount.c:865 Cannot open
Dev="usb-changer-1-drive-1" (/var/spool/bacula/vchanger1/1/drive1),
Vol=vchanger1_0003_0027
#==== excerpt from log for job 25919
03-Jan 17:07 s3-dir JobId 25919: Start Backup JobId 25919,
Job=access.2012-01-03_17.07.09_58
03-Jan 17:30 s3-dir JobId 25919: Recycled volume "vchanger1_0004_0018"
03-Jan 17:30 s3-dir JobId 25919: Using Volume "vchanger1_0004_0018" from
'Scratch' pool.
03-Jan 17:30 s3-dir JobId 25919: Using Device "usb-changer-1-drive-1"
03-Jan 17:30 access-fd JobId 25919: shell command: run ClientRunBeforeJob
"/usr/libexec/bacula/bacula_before"
03-Jan 17:30 s3-sd JobId 25919: 3307 Issuing autochanger "unload slot 27, drive
1" command.
03-Jan 17:30 s3-sd JobId 25919: 3304 Issuing autochanger "load slot 118, drive
1" command.
03-Jan 17:30 s3-sd JobId 25919: 3305 Autochanger "load slot 118, drive 1",
status is OK.
03-Jan 17:30 s3-sd JobId 25919: Recycled volume "vchanger1_0004_0018" on device
"usb-changer-1-drive-1" (/var/spool/bacula/vchanger1/1/drive1), all previous
data lost.
03-Jan 17:30 s3-dir JobId 25919: Max Volume jobs=1 exceeded. Marking Volume
"vchanger1_0004_0018" as Used.
03-Jan 17:30 s3-sd JobId 25919: Fatal error: block.c:439 Attempt to write on
read-only Volume. dev="usb-changer-1-drive-1"
(/var/spool/bacula/vchanger1/1/drive1)
#==== Configuration Files
# bacula-dir.conf
Storage {
Name = USBChanger1
Address = 192.168.1.7
SDPort = 9103
Password = "whatever"
Device = usb-changer-1
Media Type = File
Autochanger = yes;
Maximum Concurrent Jobs = 2
}
#==== end of bacula-dir.conf
# bacula-sd.conf
Autochanger {
Name = usb-changer-1
Device = usb-changer-1-drive-0,usb-changer-1-drive-1
Changer Command = "/usr/local/bin/vchanger %c %o %S %a %d"
Changer Device = "/etc/bacula/vchanger1.conf"
}
Device {
Name = usb-changer-1-drive-0
Drive Index = 0
Autochanger = yes;
Device Type = File
Media Type = File
Removable Media = no;
Random Access = yes;
Maximum Concurrent Jobs = 1
Archive Device = "/var/spool/bacula/vchanger1/0/drive0"
SpoolDirectory = /tmp/bacula/usb-changer-1-drive-0
}
Device {
Name = usb-changer-1-drive-1
Drive Index = 1
Autochanger = yes;
Device Type = File
Media Type = File
Removable Media = no;
Random Access = yes;
Maximum Concurrent Jobs = 1
Archive Device = "/var/spool/bacula/vchanger1/1/drive1"
SpoolDirectory = /tmp/bacula/usb-changer-1-drive-1
}
#==== end of bacula-sd.conf
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