Kern Sibbald writes:

> The algorithm is very clearly described in the manual at:
> http:/www.bacula.org/dev-manual/Automatic_Volume_Recycling.html#SECTION000243000000000000000

In that url I see:
Try recycling any purged Volumes

Does this meet the criteria?
recycle = 1
Difference of current time  minus last written is greater than volretention 
column

  
> They do recycle based on the retention periods as far as I know.

I have 484, which was only 358 yesterday, volumes that meet the criteria 
above and I am just trying to determine if I am doing something wrong on how 
I am researching this. Did I miss anything in that criteria?

Example volume:
BaculaVolumeDaily0203
lastwritten: 2006-08-03
volstatus: Purged
recycle: 1
volretention: 604800
volretention/(3600*24): 7 days which matches my 7 day retention for daily 
pool
(CURRENT_DATE-lastwritten::date)::int: 45

The volume is 45 days, is marked as recycle = 1, volstatus is Purged.
Shouldn't that volume have been used instead of having new volumes created 
in that pool?  

I posted the queries that I used and would be nice if anyone else using 
postgresql could give them a spin.. and see if others have volumes on 
simmilar situation.

> algorithm is not being followed, then I haven't seen clear proof of it.

I honestly don't know if my criteria above is correct, but would like any 
feedback to improve it and if I am doing something wrong hopefully fix it.


> few people from time to time say "you see it doesn't work", but without 
> supplying all the necessary info.


What information would be helpfull?

> The problem is that the algorithm is rather 
> complex and most users either don't understand or don't read all the little 
> details.

Understood..

I am trying to look into only one part of the whole algorithm.. from the 
database perspective.. basically I am looking at volumes and their columns 
.. and trying to see if any of those volumes should have gotten used instead 
of new ones getting created.
  
> The only thing I can say is that I have seen recycling work for 3 years now 
> without fail, and if you read that chapter I am sure you can sit back like me 
> and not worry for a long time.

I am hopefull I am doing something wrong and that is just a matter of 
keeping researching and some guidance, but so far I get the impression that 
somehow many volumes that I believe (and I could be totally wrong) should be 
re-used are not getting reused.

> By the way, the database (SQLite 2.x) has remained stable at 170MB,

My postgresql DB for bacula is 30GB with daily vacuum analyze and 
autovacuum.. have lots of small files.. and have not even finished adding 
all our servers to be managed by Bacula.
  
> Full backups were running about 30GB, but after cleaning out old Photos and 
> Music files, it dropped to about 10GB ...

By the time I add all our servers we will be backing up likely close to 
1Terabyte. The very near future we need to backup 500G, so getting volumes 
to be reused properly is a big issue for us.

For reference the queries I am using, on postgresql, to research this are:

-- Volumes I believe should have been re-used but arent
select volumename,mediatype,firstwritten::date,lastwritten::date,
labeldate::date,volstatus,recycle, volretention,
volretention/(3600*24) as Retention, (CURRENT_DATE-lastwritten::date)::int  
as Age
from media where volstatus = 'Purged' and recycle = 1 and
volretention/(3600*24) < (CURRENT_DATE-lastwritten::date)::int
limit 10;


-- Count only
select count(*)
from media where volstatus = 'Purged' and recycle = 1 and
volretention/(3600*24) < (CURRENT_DATE-lastwritten::date)::int
 

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