John I have skimmed over this e-mail every thing looks like it makes perfect sense. I will fully digest it tomorrow and will ask questions if I have any. I will first read the links you included.
I was meaning to put in my previous e-mail that you can recover information off a volume using bscan (its been a long day). Hope your headache subsides and tomorrow will bring a brighter day... ITS FRIDAY! As always everyone here is a great help. -H -----Original Message----- From: John Drescher [mailto:dresche...@gmail.com] Sent: Thursday, November 05, 2009 2:48 PM To: Hayden Katzenellenbogen; bacula-users Subject: Re: [Bacula-users] Tape Retention Strategy help > Here is what I understand about the file, job and volume retentions. > (please correct me if I am wrong) > > File Retention: This how long the individual files will be kept in the > catalog database. As long as the files are available in the database you > can restore a single file. Once the files are purged out as long as the > job is still in the database you can restore the entire job. > You can get the missing data back in the database using bscan. > Job Retention: This is how long the job information remains in the > database. As long as the job information is available you can restore > the entire job. You can not restore a single file within the job if the > file retention period has elapsed. > Again you can recover from this using bscan. > > Volume Retention: This is the period of the time the actual data on a > tape is kept. This is where I think I am having problems. > Not exactly. After a volume is Full or Used (see below for this) the volume retention period begins. After the volume retention period ends bacula can reuse the volume if it needs a new volume for that pool. > > 1. When the volume retention period elapses does Bacula mark the entire > volume to be recycled? > When bacula needs a volume it will purge a volume that is past its retention period if it finds one. > > 2. Is there a way to mark the space on the tape as available once a job > has been purged from the database? No, all bacula volumes are purged in their entirety. > > Right now all our servers dump their backups (tar or windows backup) > onto an NFS share on this server. Once I have the backup strategy nailed > down I will installed bacula-fd on the servers and backup them up via > Bacula. So all the data that Bacula needs to backup is all on the local > raid volume. > > Ultimate goal: > > 1. Two LTO4 tapes. > 2. Tape one for even weeks of the year > 3. Tape two for odd weeks of the year > 4. Perform a full backup 150-200GB every week > 5. Keep 2 months worth of full backups > > > Current pool setup > Pool { > Name = OddWeek-Pool > Pool Type = Backup > Recycle = yes # Bacula can automatically recycle > Volumes > AutoPrune = yes # Prune expired volumes > Volume Retention = 1 year > } > > Pool { > Name = EvenWeek-Pool > Pool Type = Backup > Recycle = yes # Bacula can automatically recycle > Volumes > AutoPrune = yes # Prune expired volumes > Volume Retention = 1 year > } > Pool { > Name = Recording-Pool > Pool Type = Backup > Recycle = yes # Bacula can automatically recycle > Volumes > AutoPrune = yes # Prune expired volumes > Volume Retention = 6 days > } > That definitely will not work. You need at least 2 tapes for each pool and after that you need to shorten the volume retention period to ~59 days instead of 1 year. Also remember that volume retention does not even begin until the tape is marked Full or Used. Full is obvious - tape is full. A volume can become used if you set either of the following: Use Volume Once = yes Volume Use Duration = ttt http://www.bacula.org/en/rel-manual/Automatic_Volume_Recycling.html I hope you can understand me. I have a really bad headache so I may not be making a lot of sense.. John ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
