By default, every volume contains a directory named .snapshot through which users can access old versions of files in that directory. Users can gain access to Snapshot copies depending on the file-sharing protocol used—NFS or CIFS. Access to Snapshot copies can be turned off.
Snapshot files carry the same read permissions as the original file. A user who has permission to read a file in the volume can read that file in a Snapshot copy. A user without read permission to the volume cannot read that file in a Snapshot copy. Snapshot copies do not have write permissions.
How to Access to Snapshot copies over CIFS:
By default, CIFS users cannot see the .snapshot directory. To allow CIFS users to see the .snapshot directory, you can set the cifs.show_snapshot option to on.
To CIFS users, the .snapshot directory appears only at the root of a share. For example, if a user’s home directory is a share named bill that corresponds to the /vol/vol0/home/bill directory, only the /vol/vol0/home/bill/.snapshot directory is visible. When this user displays the contents of the home directory, the .snapshot directory is displayed as ~snapshot if the operating system supports long file names and as ~SNAPSHT if the operating system supports only short file names.
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Why create the linux client a new mountpoint (df -h), when I access a snapshot (2015-11-25_1200+0100_hourly)over the original mountpoint (/usr/shared/home/user1)?
df -h (I have now two mountpoints)
Filer:/vol/nfs_shares/homedirs/linux/user1 40G 28G 13G 70% /usr/shared/home/user1 <-- This is expected
Filer:/vol/nfs_shares/homedirs/linux/user1/.snapshot/2015-11-25_1200+0100_hourly 480G 99G 382G 21% /usr/shared/home/user1/.snapshot/2015-11-25_1200+0100_hourly <-- This NEW mountpoint is not expected