restore large files from tape

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Re: restore large files from tape

Veeam Logoby foggy » Mon Mar 03, 2014 2:13 pm

Alex, have you had a chance to open a case with support team?
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Re: restore large files from tape

Veeam Logoby Escapo IT » Thu Mar 06, 2014 12:53 pm 4 people like this post

Had a chance to retest this scenario and happy to report this seems fixed for me with 839.

Took a new backup (backup-to-tape), split over two LTO5 tapes, restore ~1TB vbk file to local filesystem. Compared filesize, they are identical. Was able to import the VBK file into Veeam, was able to "double-click" the VBK file to see the contents within Veeam, ran backup validator which showed no errors. Load of my mind !!

To the others reading this thread; The patch notes and the comments from Veeam here on the forums seem to indicate this is environment specific, in fact the whole tape ecosystem seems to be a minefield of slight variations depending on drive/library/manufacturer, so I would urge you to test this for yourself, even after applying patch 3a. A backup is worthless without the ability to restore it !!

We have certainly been guilty of being lazy in that regard but this has opened my eyes and I will push for better policies making regular checks mandatory, perhaps using something like SureBackup as a first step.
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Re: restore large files from tape

Veeam Logoby v.Eremin » Thu Mar 06, 2014 1:14 pm

Yes, as far as I know, the said issue was related to specific combination of devices, etc. So, even with the latest patch, it's worth double checking backup recoverability.

Also, it's recommended to verify the source backup data, so that, the potential corruption isn't copied to secondary location by backup copy or backup to tape job. The best way to do in automatic fashion is to use SureBackup functionality.

Anyway, thanks for coming back and confirming that the latest patch solves the issue.
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Re: restore large files from tape

Veeam Logoby mazur1000 » Thu Mar 06, 2014 3:01 pm

Yes. The latest patch solves the problem with restoring from tape backup is virtual machines created using veeam. If using veeam to backup and then restore individual files, the problem persists (ibm ts3200 lto 6).
When backups of the same file on the same library using symantec no problems
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Re: restore large files from tape

Veeam Logoby foggy » Thu Mar 06, 2014 4:25 pm

As it is stated above, probably this is just another issue around the same topic, so please kindly continue working with support to address it.
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Re: restore large files from tape

Veeam Logoby Gostev » Sun Mar 09, 2014 8:00 pm 1 person likes this post

Escapo IT wrote:Had a chance to retest this scenario and happy to report this seems fixed for me with 839.

Took a new backup (backup-to-tape), split over two LTO5 tapes, restore ~1TB vbk file to local filesystem. Compared filesize, they are identical. Was able to import the VBK file into Veeam, was able to "double-click" the VBK file to see the contents within Veeam, ran backup validator which showed no errors. Load of my mind !!

To the others reading this thread; The patch notes and the comments from Veeam here on the forums seem to indicate this is environment specific, in fact the whole tape ecosystem seems to be a minefield of slight variations depending on drive/library/manufacturer, so I would urge you to test this for yourself, even after applying patch 3a. A backup is worthless without the ability to restore it !!

We have certainly been guilty of being lazy in that regard but this has opened my eyes and I will push for better policies making regular checks mandatory, perhaps using something like SureBackup as a first step.

Thanks for coming back to confirm the issue is resolved. And you are right, over 80% of tape-related issues we've faced so far were device-specific issues instead of our bugs. Nevertheless, we are forced to put workarounds directly in our code, because it provides our customers with the solution about 10x times faster than what it takes a typical hardware vendor to fix the drivers code (unless the issue sits in hardware, which makes it even longer).
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Re: restore large files from tape

Veeam Logoby foggy » Tue Mar 11, 2014 11:46 am

Alex, it would be much appreciated if you could provide your case ID here, our QA guys are very is interested in it.
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Re: restore large files from tape

Veeam Logoby mazur1000 » Tue Mar 11, 2014 12:23 pm

well, I'll create today
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Re: restore large files from tape

Veeam Logoby mazur1000 » Tue Mar 11, 2014 1:38 pm 1 person likes this post

case 00529403
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Re: restore large files from tape

Veeam Logoby Gostev » Tue Mar 11, 2014 10:42 pm

mazur1000 wrote:Yes. The latest patch solves the problem with restoring from tape backup is virtual machines created using veeam. If using veeam to backup and then restore individual files, the problem persists (ibm ts3200 lto 6)

This is very strange. We happen to have the exact same tape library in our QC lab. We did multiple tests with large files in the past few days, and could not confirm the issue. Thanks for opening a support case, may be the debug logs will shed some light...
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Re: restore large files from tape

Veeam Logoby mazur1000 » Wed Mar 12, 2014 10:00 am

Can there be such a problem because of the built-in encryption library. Prior to installation patch3 I tried without encryption, the problem was the same
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Re: restore large files from tape

Veeam Logoby foggy » Wed Mar 12, 2014 10:08 am

Further investigation is likely to give answers to this and other questions, so please continue working with our engineers.
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Re: restore large files from tape

Veeam Logoby Dima P. » Wed Mar 12, 2014 10:49 am

Alex,

Could you, please, clarify - you enabled/disabled tape library built in encryption after installing patch 3? If it is on, are you using it for library or on single drive only? Enabling/disabling hardware encryption could dramatically impact performance on backup/restore operations from tape libraries. (as well as hardware compression).

Thank you.
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Re: restore large files from tape

Veeam Logoby mazur1000 » Wed Mar 12, 2014 12:11 pm

No, I tried to backup-recovery without encryption before installing patch3. Encryption is used for all drives at the library level. Speed ​​difference between encryption and no encryption I have not seen
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Re: restore large files from tape

Veeam Logoby Dima P. » Wed Mar 12, 2014 1:45 pm

Alex,
Got it! I’ve already send this information to our support department. Thank you for the heads up!
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