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Storage access via NFSv4 intermittently hangs or gets disconnected

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Category:
fas-systems
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • NFSv4

Issue

  • Data was migrated from 7-mode to ONTAP 9.11.1P16
  • Symptoms included:
    • Intermittent data hangs and disconnects
    • Delays when listing directories via ll command
    • NetBackup backup failures with network timeouts
    • Observed a persistent file lock that could not be cleared even after umount and vserver lock break commands

A400::*> vs locks break -vserver vserver1 -volume vol1 -path /vol1/path/file1
  (vserver locks break)

Warning: Breaking file locks can cause applications to become unsynchronized and may lead to data corruption.
Do you want to continue? {y|n}: y
1 entry was acted on.

A400::*> vs locks show -vserver vserver1 -volume vol1 -client-address 192.168.xxx.xxx -fields lockid 
  (vserver locks show) 
vserver volume lif           lif-id path                                                                                           lockid                                
------- ------ ------------- ------ ---------------------------------------------------------------------------------------------- ------------------------------------  
vserve1     vol1     nas_lif1 1027   /vol1/path/file1                            xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx 

  • pNFS was disabled

<v4.1_pnfs>disabled</v4.1_pnfs>

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