Hi,
08.11.2007 22:05,, Craig White wrote::
> On Fri, 2007-11-02 at 23:05 +0100, Arno Lehmann wrote:
>> Hi,
>>
>> 02.11.2007 21:48,, Craig White wrote::
>>> On Fri, 2007-11-02 at 21:38 +0100, Arno Lehmann wrote:
>>>> Hi,
>>>>
>>>> 02.11.2007 21:26,, Craig White wrote::
>>>>> On Fri, 2007-11-02 at 15:08 -0400, John Drescher wrote:
>>>>>> On 11/2/07, Craig White <[EMAIL PROTECTED]> wrote:
>>>>>>> I am a bit befuddled.
>>>>>>>
>>>>>>> I have a 'Full' backup which consists of 4 jobs but it extends onto 2
>>>>>>> tapes.
>>>>>>>
>>>>>>> the Pool permits 4 jobs
>>>>>>> Maximum Volume Jobs = 4
>>>>>>> Volume Retention = 19d
>>>>>>> Volume Use Duration = 4d
>>>>>>>
>>>>>> I believe "Maximum Volume Jobs" here will allow at most 4 jobs to a
>>>>>> single volume and since there are only 2 jobs written to the last
>>>>>> volume it can hold 2 more.
>>>>> ----
>>>>> I get that. I can't change the number to 2 because then it would stop
>>>>> after the second job and force me into a new tape leaving half the first
>>>>> tape filled and not enough room on second tape to complete the next 2
>>>>> jobs (the second being a standard BackupCatalog job).
>>>>>
>>>>> I find it hard to believe that I am the only one who is spanning tapes
>>>>> on a single Pool and wanting to have the last tape marked 'Used' instead
>>>>> of 'Append'
>>>> True... but as it is, many users try to avoid problems they might run
>>>> into when jobs are added, or don't run for whatever reason, so they
>>>> don't limit the volume use by the number of jobs, but rather by the
>>>> time it can be used after an initial write ;-)
>>>>
>>>> So my suggestion is to use "Volume Use Duration" instead of the job
>>>> limit. Depending on your needs, limiting by size might also be useful
>>>> - "Maximum Volume Bytes" is the corresponding option.
>>>>
>>>> Does that help?
>>> ----
>>> in that I have set (as noted above) Volume Use Duration to 4d, if it
>>> marks the set as 'Used' on Tuesday (Friday, Saturday, Sunday, Monday)
>>> constituting the 4 days and then Bacula respects the 'Volume Retention',
>>> I am good to go.
>> In my experience, Bacula does handle retention periods correctly.
>>
>>> As you might expect, I am concerned that the next usage of ThursdayPool,
>>> that it asks for this Volume because it is still marked 'Append' and I
>>> would want it to ultimately ask for the one of the ThursdayPool volumes
>>> whose 'Volume Retention' has expired.
>> Let's say your volume is marked as used on Thursday, and it's been
>> last written to on Thursday, too, and you've got a retention time of
>> six days, that volume could be recycled next weeks Thursday.
>>
>> If you swapped the volumes and updated the catalog accordingly, Bacula
>> will prefer volumes in the autochanger, i.e. when it needs a Thursday
>> volume, it will prune, recycle, and use that volume automatically.
>>
>> I think this is what you need.
> ----
> OK - here it is the next Thursday.
>
> Tape with 2 jobs from last Friday is not now, nor was ever marked 'Used'
> - it is still marked 'Append'
>
> # bconsole
> Connecting to Director linserv1.mullenpr.com:9101
> 1000 OK: LINSERV1 Version: 2.2.5 (09 October 2007)
> Enter a period to cancel a command.
> *list media pool=ThursdayPool
> Automatically selected Catalog: MyCatalog
> Using Catalog "MyCatalog"
> +---------+-------------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
> | MediaId | VolumeName | VolStatus | Enabled | VolBytes |
> VolFiles | VolRetention | Recycle | Slot | InChanger | MediaType |
> LastWritten |
> +---------+-------------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
> | 10 | 1_Friday_Week_3 | Append | 1 | 39,130,656,768 |
> 41 | 1,641,600 | 1 | 0 | 0 | LTO | 2007-11-02
> 10:50:33 |
> | 11 | 1_Thursday_Week_3 | Full | 1 | 130,561,191,936 |
> 132 | 1,641,600 | 1 | 0 | 0 | LTO | 2007-11-02
> 03:30:19 |
> | 16 | 1_Friday_Week_1 | Append | 1 | 64,512 |
> 0 | 1,641,600 | 1 | 0 | 0 | LTO | 0000-00-00
> 00:00:00 |
> +---------+-------------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>
> Pool {
> Name = ThursdayPool
> Pool Type = Backup
> Recycle = yes
> AutoPrune = yes
> Volume Retention = 19d
> Volume Use Duration = 4d
> Maximum Volume Jobs = 4
> }
>
> Since 1_Friday_Week_3 was last written 2007-11-02 and more than 4d have
> passed, it's pretty clear that if Bacula was going to mark that volume
> 'Used', it would have done so by now. It hasn't
It will only be marked "Used" when Bacula looks for a usable volume
and considers it. Bacula does not have an internal marker to indicate
that, on 2007-11-06 (or whatever the result of FirstWritten+4d would
be) this tape has to marked as used. Instead, only when considering
this as a volume to use, it encounters the state of
(FirstWritten+VolUseDuration<nom() if that makes sense...) and sets
the status accordingly.
>
> Short of marking the volume 'Used' manually, how can I ensure that the
> Volume is properly prevented from re-use during the 19 days of Volume
> Retention?
Try it - I'm fairly sure Bacula will not add to this volume. If I'm
wrong I'll have to re-think what I implemented some times now :-)
Arno
> Craig
>
>
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--
Arno Lehmann
IT-Service Lehmann
www.its-lehmann.de
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