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

Natxo Asenjo natxo.asenjo at gmail.com
Wed Oct 12 12:54:09 UTC 2016

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    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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