Isilon: MacOS SMB clients cannot access Snapshot directory from OneFS 8.0.0.x to 8.1.2.0 clusters

MacOS clients that use the SMB1 or SMB2 protocol to access an Isilon cluster running 8.0.0.x to 8.1.2.0 will receive a "No such file or directory" error when attempting to access a Snapshot directory.

OneFS 8.0.0.x to 8.1.2.0 were changed to prevent access to Snapshot directories from Mac clients, to avoid the effects of a mountpoint stop responding as described in KB 471801.

To function correctly for a client the cluster must be running one of the following version combinations:

• OneFS 8.1.2.0 with 8.1.2.0_UDA-RUP_2019-07 or later
• OneFS 8.2.0.0 or later

And, for clients to be able to access Snapshot directories on SMB shares below /ifs (for instance /ifs/subdir/.snapshot) the following SMB settings must be set to Yes, as viewed from isi smb settings global view:

  Dot Snap Accessible Child: Yes
   Dot Snap Accessible Root: Yes
     Dot Snap Visible Child: Yes
      Dot Snap Visible Root: Yes

Finally, Mac clients must use the workaround from KB 47801 to prevent their mountpoints from going unresponsive after changing to the Snapshot directory.