Forever forward and synthesizing full to tape

Everything about backing up to tape

Re: Forever forward and synthesizing full to tape

Veeam Logoby Steen » Fri May 22, 2015 1:52 pm

Shestakov wrote:You can always go for "traditional" incremental backup method which includes periodic full backups and set a proper retention.



What is that?
Please use correct name.
If you mean Reverse incremental then tape-job will fail because Backup-job will run next day and the tape-job isnt done.

So if you have much data to tape you cant use Reverse incremental
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Re: Forever forward and synthesizing full to tape

Veeam Logoby v.Eremin » Fri May 22, 2015 1:55 pm

4. Marked all Tapes as free

That's the root cause of the described behaviour. You've cleared the tape catalogue, so that, tape jobs is neither aware of original full, nor of the virtual ones created later on.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Shestakov » Fri May 22, 2015 1:58 pm

I meant backup job Forward incremental backup method. Thanks.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Steen » Fri May 22, 2015 2:08 pm

v.Eremin wrote:
4. Marked all Tapes as free

That's the root cause of the described behaviour. You've cleared the tape catalogue, so that, tape jobs is neither aware of original full, nor of the virtual ones created later on.



ok.
I dont understand.
if the original full backup expires then it will be overwriten? then it wont exist any more?
Or does Veeam still have it on catalog ?
What happend if the same tape will be use to another Pool (after expiration)
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Re: Forever forward and synthesizing full to tape

Veeam Logoby v.Eremin » Fri May 22, 2015 2:40 pm

If the explanation provided previously doesn't work for you, let me approach it from a different angle.

If in that case you had erased all tapes but one that contained the latest virtual full backup, backup server would have archived two full backups to tape. Instead, it would have proceeded with just one virtual full backup.

Thanks.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Steen » Fri May 22, 2015 3:15 pm

v.Eremin wrote:If the explanation provided previously doesn't work for you, let me approach it from a different angle.

If in that case you had erased all tapes but one that contained the latest virtual full backup, backup server would have archived two full backups to tape. Instead, it would have proceeded with just one virtual full backup.

Thanks.


I think i understand.
pls correct me if im wrong.
When a Synthetic backup (only that, not full) is created, there must be a previous backup (full or Synthetic) on tape. otherwise there will be a Full and then Synthetic on tape.
After Synthetic backup is done, old (previous) can be move to free?
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Re: Forever forward and synthesizing full to tape

Veeam Logoby v.Eremin » Fri May 22, 2015 3:52 pm

Correct.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Steen » Fri May 22, 2015 4:05 pm

v.Eremin wrote:Correct.


good.
I make a test during this weekend with only one VM.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Treeeman » Sat May 23, 2015 5:19 am

Hello,

at my previous veeam installation i had following issue with syntetic full to tape.
I have created serveral forward incremental forever jobs with 3 Restore Points (further Restore Points are created with daily Backup Copy) running at 21:00 PM on each day. The first run of my newly created Jobs was sunday. So a VBK File was created. That's fine. I also created a Backup to Tape Job to offload the files to tape.

Unfortunatelly the Tape Autoloader had a hardware issue so the tape job failed. On Friday the Autoloader was repaired and i startet the Tape Job. The Backup Job stored the VBK File from my forward incrementel forever Job on Tape and additionally the syntetic full from the restore point of Thursday evening.

Luckily it was no problem to store two vbk files on tape.
But what should i do in this case if i don't have space on tape to store two vkb files?

Thanks.

Kind Regards
Marco
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Steen » Sat May 23, 2015 10:06 am

Treeeman wrote:Hello,

at my previous veeam installation i had following issue with syntetic full to tape.
I have created serveral forward incremental forever jobs with 3 Restore Points (further Restore Points are created with daily Backup Copy) running at 21:00 PM on each day. The first run of my newly created Jobs was sunday. So a VBK File was created. That's fine. I also created a Backup to Tape Job to offload the files to tape.

Unfortunatelly the Tape Autoloader had a hardware issue so the tape job failed. On Friday the Autoloader was repaired and i startet the Tape Job. The Backup Job stored the VBK File from my forward incrementel forever Job on Tape and additionally the syntetic full from the restore point of Thursday evening.

Luckily it was no problem to store two vbk files on tape.
But what should i do in this case if i don't have space on tape to store two vkb files?

Thanks.

Kind Regards
Marco


I would guess that You have to enter an additional tape and it will continue
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Treeeman » Sat May 23, 2015 10:52 am

Off course would it possible to simply add more tapes. In an environment with a tape autoloader and enough tapes not that big issue.
But this is not what i am looking for.

Let us guess i dont have a autoloader. Just a standalone drive and just the space on one tape to store one vbk file for each VM.
The most of my customers dont have space on tape to store multible VBK Files for each VM.

In my case for each Server two VBK files will be stored on tape.
After the half of my VMs get processed my tape will get full (because 2 VBK for each VM) and i have had to put a second tape to my standalone drive.
In case i do so, i still have the issue the Backup for my VMs is spanned over two tapes. This is not my goal.

Of course this issue may only happen at the first run (i think and i hope)
But for my customers with limited tape capacity it is hardly to understand and accept why this is happening.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby v.Eremin » Mon May 25, 2015 10:07 am

You're saying that you don't have tapes to host even two .vbk files? So, your tapes will be overwritten, each time tape job takes place?

In this case, you can put into use files to tape job in combination with some scripting (required to find the latest .vbk) or switch source jobs to reversed incremental mode.

Thanks.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Treeeman » Mon May 25, 2015 2:05 pm

Lets assume i have a customer with a standalone Autoloader. My Customer has 10 Tapes. 5 Tapes for Weekly with even weeknumber and 5 Tapes for odd weeknumbers.
I have serveral forward incremental forever Jobs and a Backup to Tape Job like described above. Tape Job is scheduled on weekdays. Within the Tape Job i selected syntetic full for Monday till Friday.

On one single tape i have space to store one .vbk file for each VM i backup.
Goal is to store the last restore point for each weekday as a syntetic full on one tape.
So my Customer is able to take Backups of each VM from a single day outside the office.

Problem:
If the scheduled Tape Job is running for the first time and there are meanwhile more restore points (1x .vbk at the first run and multible .vib) there will be stored two .vbk files for each VM. The Tape will be full before each VM is processed. So for this case i have to use two tapes for the first run.

Like i read within this topic it is "by design" to store always the first .vbk File of a Forward Incremental Forever Job on tape.
Maybe there is the possiblity to add a Option within the Tape Job to ignore the first .vbk file and only save the syntetic full for the last restore point of each vm which is generated from the .vbk file and the needed .vib files.

I hope you understand what i mean.
Thanks.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby v.Eremin » Mon May 25, 2015 2:28 pm

Are also concerned with disk space? If not, you can execute manual full backup, and re-create the tape job making it copy only the latest portion of existing chain. Thanks.
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Re: Forever forward and synthesizing full to tape

Veeam Logoby Treeeman » Tue May 26, 2015 8:05 am

Ok. I will use this workaround for the future. Thanks!
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