[OmniOS-discuss] cifs smb 2.1 errors when using windows 10 backup tool

[Gordon Ross]

Interesting finding re. VHD support needing resiliency support in SMB 2.1.
Thanks for the KB article: https://support.microsoft.com/en-us/kb/2920193

We have resiliency support in NexentaStor 5.0 (shameless plug:)
https://nexenta.com/products/nexentastor
We should work on upstreaming that code soon.


On Wed, Oct 12, 2016 at 8:54 AM, Natxo Asenjo <natxo.asenjo at gmail.com> wrote:
> hi,
>
> There is  a w10 system at the home and it's a bit critical for the wife ;-),
> so I want to have this up and running asap if some kind of trouble happens
> with it.
>
> Anyway, this windows 10 OS has a backup tool that allows you to dump an
> image to a network share using cifs, obviously.
>
> So I have a zfs file system, shared it for cifs, set the permissions for the
> share. Start the backup, and it will fail consistently when it has reached
> 57%.
>
> After much searching, I found this:
> https://social.technet.microsoft.com/Forums/windows/en-US/c2032e37-ebe9-4221-9d37-5525fcdaae19/windows-8-backup-win7-file-recovery-system-image-creation-to-nas-device-fails-with-error?forum=w8itprogeneral
>
> And yes, after:
>
> # sharectl set -p max_protocol=1 smb
>
> and restarting the cifs service, now the backup is running correctly (97%
> and counting).
>
> Apparently it has to do with 'resilency support', whatever that may be:
>
> https://support.microsoft.com/en-us/kb/2920193
>
> Which is a shame, because now the cifs host is limited to smb 1.5 instead of
> 2.1 (but at least it works).
>
> Hopefully I spare somebody some unnecessary pain with this info. And it
> would be awesome if this 'resiliciency support' made it to the cifs server
> in a next version ;-)
>
> Thanks!
>
> --
> Groeten,
> natxo
>
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