restore large files from tape

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restore large files from tape

Veeam Logoby mazur1000 » Thu Feb 20, 2014 7:12 am

veeam 7 patch 3
when restoring large files (3-10 TB) from tape (ibm 3200 lto 6) recovered file size turns out not to be the size of the original (differs by about 100-200 KB).
Recovered files gets corrupted.
And the size of the recovered file becomes invalid in the last stage recovery
Before installing patch 3 was a mistake: Script execution timed out
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Re: restore large files from tape

Veeam Logoby v.Eremin » Thu Feb 20, 2014 8:53 am

Hi, Alex,

What type of restore you're using? Also, does the given backup file reside on one tape or on many of them?

Thanks.
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Re: restore large files from tape

Veeam Logoby mazur1000 » Thu Feb 20, 2014 1:30 pm

I use RESTORE FILE FROM TAPE
Tried to recover. Vbk 6TB file and a file created using acronis 3 TB.
In the former case, three backup tapes held in the second - 2 tape.
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Re: restore large files from tape

Veeam Logoby v.Eremin » Thu Feb 20, 2014 1:35 pm

So, both files were shown as corrupted, right?

Anyway, it seems that deep log investigation is required here, so, please, open a ticket with our support team and let them investigate it directly.

Also, once opened, kindly, post your ticket number here for the convenience of future readers.
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Re: restore large files from tape

Veeam Logoby mazur1000 » Sun Mar 02, 2014 10:58 am

I installed Patch # 3a (build 7.0.0.839). After installing the problem persists ( I completely removed veeam, set , set Patch # 3a, set up the new configuration. Copied to tape file and restored it ) File occupies a volume of more than one tape . After installing the patch build 7.0.0.839 restored Fals began to occupy more than 200GB on the original. Prior to installing the patch 3a (version 7.0.0.833 ), the difference between the original and the restored file was 100KB .
After installing Patch # 3a situation with the restoration has become virtually the same as in version 7.0.0.771. Only on 7.0.0.771 when restoring error was Script execution timed out, and now it's not, but the restored file is broken .
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Re: restore large files from tape

Veeam Logoby mazur1000 » Sun Mar 02, 2014 11:00 am

The newer Patch #3a build additionally addresses the following issues: ◾ Spanning a large file across multiple tapes may be performed incorrectly with certain tape drives that do not implement sending the end of media event. As a result, the restored file may have some of its parts corrupted.
This problem is not solved
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Re: restore large files from tape

Veeam Logoby v.Eremin » Sun Mar 02, 2014 4:18 pm

Have you had a chance to contact the support team with this? This sort of issues typically requires logs investigation and can't be addressed properly via forum correspondence.

Thanks.
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Re: restore large files from tape

Veeam Logoby Escapo IT » Mon Mar 03, 2014 10:24 am

We *MIGHT* be impacted by this aswell; As a result of seeing this thread I am trying to conduct a test.

I have an IBM TS3200 library with an LTO6 drive (LTO5 cartridges though) with a rather large ~1TB VBK file spanning 2 tapes. I am currently restoring this as a file to a local filesystem on the primary Veeam server. Any tips on how to verify the integrity of this VBK file, short of trying to restore all of the 50 or so machines it contains ?

As an aside: The restore from tape seems quite a bit slower (~150 GB/hour) then the copy to tape (~450 GB/hour), but hey :)
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Re: restore large files from tape

Veeam Logoby v.Eremin » Mon Mar 03, 2014 10:37 am

Based on OP post, he seemed to get corruption error immediately when he tried to perform restore procedure. Also, are currently on the latest product patch? Do you see any difference in size of original and restored backups? Thanks.
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Re: restore large files from tape

Veeam Logoby foggy » Mon Mar 03, 2014 10:40 am

Escapo IT wrote:Any tips on how to verify the integrity of this VBK file, short of trying to restore all of the 50 or so machines it contains ?

You can utilize the backup validator command-line tool to perform this task.
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Re: restore large files from tape

Veeam Logoby Escapo IT » Mon Mar 03, 2014 1:14 pm

The restore from tape to local storage as a VBK file went fine. We are using 'Reverse Incremental' and the job has run since duplicating to tape so cannot compare file size. Software version 833.

Upon importing the VBK file (before using the backup validator tool) the following error appears;
Code: Select all
---------------------------
Backup & Replication
---------------------------
Dir failed, storageFileName 'V:\RESTORE\GeneralPurpose2014-03-01T203103.vbk'

All instances of the storage metadata are corrupted.


---------------------------
OK   
---------------------------


So it would appear there is a real issue here !
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Re: restore large files from tape

Veeam Logoby foggy » Mon Mar 03, 2014 1:37 pm

I suggest trying backup validator and contact support for investigation.
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Re: restore large files from tape

Veeam Logoby Escapo IT » Mon Mar 03, 2014 1:43 pm

Can you use the validator on a VBK file without importing it first ? Cause the import fails, ...

According to the OP patch 3a does not solve the issue for him. Do you suggest I contact support now (running 833) or upgrade to 839 first, retest & then contact support should the issue not be solved ?
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Re: restore large files from tape

Veeam Logoby foggy » Mon Mar 03, 2014 1:51 pm

Escapo IT wrote:Can you use the validator on a VBK file without importing it first ? Cause the import fails, ...

Yes, just point it to a backup file on disk, no need to import it first.

Escapo IT wrote:According to the OP patch 3a does not solve the issue for him. Do you suggest I contact support now (running 833) or upgrade to 839 first, retest & then contact support should the issue not be solved ?

I would try and upgrade first as the fix introduced in the patch could address your particular occasion of the issue (as far as I understand, the issue is specific to some certain tape drives).
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Re: restore large files from tape

Veeam Logoby mazur1000 » Mon Mar 03, 2014 2:09 pm

copy to tape file folder (backup created acronis - full and several incremental). Full occupies a volume 3000GB, incremental 4 x 50GB.
restore via FILE-TAPE-select a file full backup capacity 3000 GB.
In the end, after we get the file recovery volume 3200 (3000 +200)

files before backup:
F-Backup_2014_02_16_18_30_14_044D.TIB 2,95 ТB -full
F-Backup_2014_02_16_18_30_14_044D5.TIB 38,0 GB
F-Backup_2014_02_16_18_30_14_044D9.TIB 49,1GB
F-Backup_2014_02_16_18_30_14_044D11.TIB 57,2GB
F-Backup_2014_02_16_18_30_14_044D12.TIB 7,35 GB

After restore from tape full backup i had file:

F-Backup_2014_02_16_18_30_14_044D.TIB 3,10 ТБ

that differs from the sum of all reserved files at 200kb.

Pictures in this forum could not invest, sorry
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