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A Linux client creates additional mount points when accessing the .snapshot directory via NFS

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFS
  • Linux kernel 2.6.18 and later versions

Issue

  • Modern Linux clients identifies the .snapshot directory as a different filesystem, and thus as a different mount point
  • When the snapshot is deleted, clients report stale file handle for .snapshot based sub-mounts
  • Observing stale file handle error on the daily snapshot volume.
  • Restart of the server resolve the issue but again the next day receiving the same stale file handle issue with the previous day's snapshot which is already deleted:

clipboard_e02ebca13d160398903b76b56f56a2785.png

  • mount command on the Linux host displays a large number of snapshots mounted and is not able to unmount
1.1.1.1:/some_export/cluster/.snapshot/hourly.2015-08-03_0705 on /some-mount/.snapshot/hourly.2015-08-03_0705 type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountproto=,local_lock=none,addr=10.1.100.101)

 

 

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