Snapshots show as mounted in Centos 7.9

[acoustic oriole]

Got a strange issue where one team can see the list of snapshots mounted for a volume, His other server that is mounted doesnt see them

[iron furnace]

this is an NFSv4 feature. I assume the "other server" did the mount via NFSv3?

you can disable that by exporting the same fsid but that requires a full remount of all clients

https://kb.netapp.com/onprem/ontap/da/NAS/A_Linux_system_running_kernel_2.6x_creates_a_mount_point_when_accessing_the_.snapshot_directory_via_Network_File_System

theoretically it can also affect NFSv3 mounts but I have only ever seen it with NFSv4 I think...

[acoustic oriole]

Sorry missed that critical detail out! Its both NFSv3 mate

[queen blade]

I have seen it with NFSv3 before. If no access happens to the mounted snapshots it will get unmounted automatically. Some 3rd party monitoring agents tend to scan everything that's mounted on a regular basis. So the auto-unmount never happens...

[iron furnace]

yeah, in any case, it should be a cosmetic issue and not have any impact. I guess there is a client-side option somewhere to change this behavior if one server sees them and one doesn't, but I don't know where. If you disable the fs-id-change it will go away (but at least have 64-bit identifiers enabled, otherwise the 323bit ID space is rather small for the volume and the snapshots together)

[languid hazel]

as soon as you cd into the .snapshot directory of the volume's NFS export, NFS recognizes that it is a "different filesystem" and mounts it. Its perfectly normal.

[thorny island]

Except when snapshot auto delete removes snapshot and you end up with stale NFS mounts.

[zenith void]

You can disable this functionality, but it isn’t advised to do so - https://community.netapp.com/t5/ONTAP-Discussions/cDOT-NFS-snaphot-directly-automounting/m-p/115458

[acoustic oriole]

Strange they have had them drop off but they apprently never CD into the snapshot dir...