I am trying to get concurrent backups using volumes from the same disk
based pool running and am having an issue I cannot figure out.
The backups are running concurrently, but I sometimes get a "Job
<jobid> is waiting. Cannot find any appendable volumes." message. The
job does retry and does eventually run successfully with out
intervention.
What I cannot figure out is why this is occurring. There are volumes
available in the pool for purging/recycling, which is what eventually
happens, and even if there weren't the number of volumes in the pool
being used are not limited. So a new volume should be created if it is
required.
To test the setup I have a schedule that runs 6 jobs at the same time
every 10 minutes. Each of the jobs is only about 20M is size. I have
noticed that if I make the filesets larger (200MB or more, but not
sure where the boundary is) this problem does not seem to occur.
I have one pool defined as below
#----------------------------------------------------------------------------
Pool {
Name = FullPool
Pool Type = Backup
Maximum Volume Jobs = 1
Use Volume Once = yes
Maximum Volume Bytes = 10G
Recycle = yes
Action On Purge = Truncate
Auto Prune = yes
Volume Retention = 1 hour
Label Format = "FullPool-"
}
and 4 devices defined
#----------------------------------------------------------------------------
Device {
Name = FileDevice01
Device Type = File
Media Type = File01
Archive Device = /bacula_storage/FileDevice
LabelMedia = yes;
Random Access = Yes;
AutomaticMount = yes;
RemovableMedia = no;
AlwaysOpen = no;
Maximum Concurrent Jobs = 1;
}
#----------------------------------------------------------------------------
Device {
Name = FileDevice02
Device Type = File
Media Type = File01
Archive Device = /bacula_storage/FileDevice
LabelMedia = yes;
Random Access = Yes;
AutomaticMount = yes;
RemovableMedia = no;
AlwaysOpen = no;
Maximum Concurrent Jobs = 1;
}
#----------------------------------------------------------------------------
Device {
Name = FileDevice03
Device Type = File
Media Type = File01
Archive Device = /bacula_storage/FileDevice
LabelMedia = yes;
Random Access = Yes;
AutomaticMount = yes;
RemovableMedia = no;
AlwaysOpen = no;
Maximum Concurrent Jobs = 1;
}
#----------------------------------------------------------------------------
Device {
Name = FileDevice04
Device Type = File
Media Type = File01
Archive Device = /bacula_storage/FileDevice
LabelMedia = yes;
Random Access = Yes;
AutomaticMount = yes;
RemovableMedia = no;
AlwaysOpen = no;
Maximum Concurrent Jobs = 1;
Maximum Concurrent Jobs is set to 10 or more everywhere (director and
SD) else so that it is the availability of a device that limits how
many concurrent jobs can run (4 in this case).
I am happy to provide the rest configuration if needed.
Thanks
Mike
------------------------------------------------------------------------------
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