VM Restore using nbd, instead of direct SAN

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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby Buh95 » Wed Dec 30, 2015 3:47 pm

Oh... Foggy, are you sure ? Because after long discussion with support about this, nobody seemed aware of this fonctionnality.
And, unless I'm mistaken, there's no reference about this in documentation. Right ?

But I confirm that in my environment, Luns do not turn on write mode before restoration.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby foggy » Wed Dec 30, 2015 3:53 pm

Yes, Veeam B&R issues a command to switch readonly attribute for the target LUN to false prior actual restore.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby Buh95 » Thu Dec 31, 2015 7:39 am

Well, I'll contact the support again to clarify this. Thanks for your help.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby wgrixti » Thu Jun 09, 2016 4:46 am

Did you hear anything further on this? I just had the same thing happen to me where my proxy is Direct SAN connected with volumes assigned the Read Only attribute.
When doing the restore it defaulted to NBD instead of SAN.

I am curious to know if what foggy said is true? I am running v9 Update 1.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby v.Eremin » Thu Jun 09, 2016 6:34 am

Did you hear anything further on this?

This question appears to have been discussed outside of the provided case, so we cannot check it unfortunately.

I am curious to know if what foggy said is true? I am running v9 Update 1.

It is supposed to work the way Alexander's described it, if that doesn't happen, kindly, reach our support team directly.

Thanks.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby kroerig » Fri Dec 09, 2016 1:24 pm

I do have the same problem. Veeam B&R 9.5 is not using SAN-Mode for restore.
Case ID: 02000544
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby v.Eremin » Fri Dec 09, 2016 5:37 pm

Are you restoring thin disks by any chance?
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby apronk » Fri Oct 27, 2017 2:20 pm

I have the same problem as well. Veeam B&R 9.5 is not using SAN-Mode for restore.
Case ID: 02360276

Used Diskpart to clear the read-only flags, but it doesn't help, restore still happens using NBD.
All my VM's are thick provisioned and backup does work over SAN.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby foggy » Fri Oct 27, 2017 3:50 pm

Hi Arend, have you reviewed the possible limitations of direct SAN restore? If nothing applies, please continue looking into this with your support engineer.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby apronk » Fri Oct 27, 2017 7:05 pm

Hi Alexander,

Unfortunately those limitations do not apply.
It has worked in the past, so it has to do either with Veeam changes or Windows Server 2016 changes (on witch VBR resides).
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby foggy » Sun Oct 29, 2017 9:04 pm

I believe our technical staff will be able to track those changes down. Keep us informed.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby apronk » Mon Oct 30, 2017 8:19 am

So far I have to say they are not very useful, as you can probably see from the Case ID.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby foggy » Mon Oct 30, 2017 12:22 pm

I can see that investigation is still going on, but you can ask for the case escalation, if you feel deeper analysis required.
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Re: VM Restore using nbd, instead of direct SAN

Veeam Logoby apronk » Mon Oct 30, 2017 1:41 pm 1 person likes this post

Hi Alexander, the case took a good turn and Veeam Support was able to steer me in the right direction.
The problem was in our case duplicated disks, this isn't a problem for backup purposes but for restore purposes it apparently is.
I'm told this would also be solved in Update 3, but I chose to go with MPIO as presented as a solution by Veeam Support.
Configuring MPIO so that the disks are not listed twice anymore solved my restore problem, now VM's are properly restored using SAN transport mode again.

P.S. I never gave MPIO any thought since we switched from iSCSI to FC a couple of years ago...
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