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a coder
Asked: 2016-03-03 09:51:42 +0800 CST

Input/output error when attempting to mount a Windows NFS share

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I created the Windows Server 2012 share using: 

PS C:\Windows\system32> nfsshare testshare2=C:\testshare2 -o anon=yes anonuid=0 anongid=0 rw=uuu.uuu.uuu.uuu
testshare2 was shared successfully

Where uuu.uuu.uuu.uuu is the IP of my Ubuntu system.

Next, from the Ubuntu machine I mounted the Windows NFS share as follows:

sudo mount -t nfs xxx.xxx.xxx.xxx:/testshare2 /mnt/testshare2

Where xxx.xxx.xxx.xxx is the IP of the Windows Server 2012 machine.

No errors are shown when mounting, but when I ls the mounted directory, the following appears:

ls: cannot open directory /mnt/testshare2/: Input/output error

I'm not showing any errors in Ubuntu's syslog.

Here are properties of the share in Server 2012: enter image description here

Edit 1: I get the same input/output error when attempting to mount the Server 2012 NFS share from a RHEL7 machine. Mount works fine I just can't ls directory or touch files.

Edit 2: In Server 2012, the NFS log shows a successful mount to both Ubuntu and RHEL machines.

linux

2 Answers

  1. This is solved. On Server 2012:

    1. Opened Server Manager -> Shares

    2. Removed the existing share

    3. Deleted the previously shared folder

    4. Started a new share using the New Share Wizard enter image description here

    5. Selected NFS Share - Quick then clicked Next. enter image description here
    6. Selected a new folder to share in Type a custom path then clicked Next. enter image description here
    7. Confirmed Share name, local path and remote paths then clicked Next. enter image description here
    8. On the Authentication window, I selected No server authentication (AUTH_SYS), then selected Enable unmapped user access by UID/GID and made sure the Allow unmapped user acess by UID/GID radio button was selected. Then clicked Next. enter image description here

    9. On the Share Permissions window, I clicked Add.

    10. An Add Permissions window popped up. Here, next to Host, I entered the IP of the remote Linux computer that would be mounting, left Language encoding to ANSI, and set Share permissions to Read/Write. I then clicked Add at the bottom which closed the Add Permissions window.
      enter image description here

    11. On the Share Permissions window I confirmed settings entered in the previous step, then clicked Next. enter image description here
    12. On the Specify Permissions window, I clicked Next without making changes. enter image description here
    13. I confirmed settings on the Confirm selections window then clicked the Create button. enter image description here

    Then from my RHEL7 system I issued: 

    mount -t nfs sss.sss.sss.sss:/somedata /mnt/somedata/

    Where sss.sss.sss.sss is the IP of the Server 2012 system.

    From the RHEL7 machine, I confirmed write access by issuing 

    date >> /mnt/somedata/date.txt

    Then checked that the file existed from Server 2012.

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  2. When creating an NFS share from Windows Server 2016, the above instructions helped alot. One important piece is to also install the File Server Resource Manager role. Prior to that I only got input/output error and linux reported mount as nfs version 3. Afterward, linux reported nfs version 4.1 and the mount worked.

    image

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