On 18.07.2006, at 18:47, Alan Brown wrote:
> On Tue, 18 Jul 2006, Sebastian Stark wrote:
>
>
>> I also noticed problems with this kind of setup but almost never
>> got an
>> answer when asking questions about multiple drive autochanger
>> issues...
>>
>
> For the most part, this is "esoteric high end use" :-)
Probably. One of baculas strengths however is great scalability
(we're at 50TB of backup data at the moment), that's why we use it in
favour of other solutions :)
>
>
>> ps I have three drives w/ thre concurrent jobs and spooling and
>> very often
>> find two of the drives idleing while there are hundreds of jobs
>> waiting for a
>> free drive.
>>
>
> I am seeing this too.
>
> Additionally I'm getting multiple-hour hangs when trying "status
> director"
> in bconsole as it tries to check for jobs waiting to reserve a drive.
>
> The same hangs occur in the tray monitor.
>
>
> Having observed it for a while, it looks like anything using drive 1
> causes drive 0 to be locked out, but using drive 0 does not lockout
> drive
> 1.
>
Sometimes it looks to me like bacula starts three jobs, then waits
until *all* of them have finished and starts another round of three.
I am not 100% sure yet, but I guess the other jobs wait "on max
concurrent storage jobs", which I set to four. I have to find a way
to monitor all this.
I did not choose different spool directories for each drive, in my
opinion one would only benefit from this by having a dedicated hard
drive for each tape drive. Am I wrong?
I have yet to find a way to reproduce this behaviour. It's a bit hard
because you only notice this kind of stuff if you have relatively
long running jobs. What I can do is send my configuration so far.
bacula-sd.conf:
Storage {
Name = yangtse-sd
SDPort = 9103
WorkingDirectory = "/usr/local/bacula/working"
Pid Directory = "/var/run"
Maximum Concurrent Jobs = 4
}
Autochanger {
Name = neo4000
Device = Drive3,Drive4,Drive5
Changer Command = "/usr/local/bacula/etc/mtx-changer %c %o %S %a %d"
Changer Device = "/dev/scsi/changer/c4t2100001086119230d2"
}
Device {
# LTO-2 Laufwerk SCSI (NEO: Drive 1)
# Used only for permanent pool (LTO-2 tapes only!)
# thus autoselect=no
Name = Drive1
Media Type = LTO-2
Archive Device = /dev/rmt/2cbn
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
Drive Index = 0
AutoChanger = yes
Autoselect = no
Spool Directory = /export/altai0/spool
Maximum Spool Size = 429496729600 # 400G
Maximum Job Spool Size = 214748364800 # 200G
Maximum Rewind Wait = 600
Maximum Open Wait = 30
Maximum Changer Wait = 120
}
Device {
# LTO-3 Laufwerk FC (NEO: Drive 3) (dmesg: st18)
Name = Drive3
Media Type = LTO-2
Archive Device = /dev/rmt/4cbn
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
Drive Index = 1
AutoChanger = yes
Spool Directory = /export/altai0/spool
Maximum Spool Size = 429496729600 # 400G
Maximum Job Spool Size = 214748364800 # 200G
Maximum Rewind Wait = 600
Maximum Open Wait = 30
Maximum Changer Wait = 120
}
Device {
# LTO-3 Laufwerk FC (NEO: Drive 4) (dmesg: st17)
Name = Drive4
Media Type = LTO-2
Archive Device = /dev/rmt/3cbn
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
#RandomAccess = no;
Drive Index = 2
AutoChanger = yes
Spool Directory = /export/altai0/spool
Maximum Spool Size = 429496729600 # 400G
Maximum Job Spool Size = 214748364800 # 200G
Maximum Rewind Wait = 600
Maximum Open Wait = 30
Maximum Changer Wait = 120
}
Device {
# LTO-3 Laufwerk SCSI (NEO: Drive 5) (dmesg: st14)
Name = Drive5
Media Type = LTO-2
Archive Device = /dev/rmt/0cbn
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
Drive Index = 3
AutoChanger = yes
Spool Directory = /export/altai0/spool
Maximum Spool Size = 429496729600 # 400G
Maximum Job Spool Size = 214748364800 # 200G
Maximum Rewind Wait = 600
Maximum Open Wait = 30
Maximum Changer Wait = 120
}
Sebastian
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