File Copy Operation On A Widelink Path Inside A Cifs Share Might Fail When Using Smb 2.X; Domain Controller Responds With An Access Denied Error To An Smb 2.X Tree Connect Request; Controlling Nfs Requests From Nonreserved Ports - IBM N Series Manual

File copy operation on a widelink path inside a CIFS share might fail
when using SMB 2.x
If you try to copy a large file to a folder that is within a widelink path inside
the root of the CIFS share and the size of the file being copied is greater than
the available space at the root of share, the copy operation fails.
This issue occurs if you are using Windows Explorer for the copy operation
on an SMB 2.x capable client with the SMB 2.x protocol enabled.
This happens because, when calculating whether there is available space for
the copy operation to succeed, the Windows client refers to the root of the
share when calculating available space. This leads to a condition where the
operation fails if there is insufficient space at the root of the share, even if the
folder inside the root of the share resides within a widelink to a different
volume that has enough available space for the copy operation to succeed.
The following are possible workarounds for this issue:
v Copy the file using the DOS command prompt.
v Copy the file using the Windows PowerShell interface.
v Create a CIFS share mounted on the widelink point, map the share on the
Windows client, and perform the copy operation.
Note: This issue does not occur if SMB 1.0 is used for the file copy
operation.
Domain controller responds with an access denied error to an SMB 2.x
tree connect request
A domain controller can respond with a 0xc0000022 error (Access Denied) to
an SMB 2.x tree connect request from the storage server on IPC$.
This issue is most likely due to a race condition between changing the
smb2.signing.required option and creating a session setup message.
To avoid this issue, disable SMB 2.x on the storage system by entering the
following command:
options cifs.smb2.client.enable off

Controlling NFS requests from nonreserved ports

You can reject NFS mount requests from nonreserved ports by enabling the
nfs.mount_rootonly option. To reject all NFS requests from nonreserved ports,
you can enable the nfs.nfs_rootonly option.
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IBM System Storage N series: Data ONTAP 8.0.4 7-Mode Release Notes