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NFS clients experience disconnections, time-outs, or performance issues due to client tuning parameters

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ontap-9
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nas
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Applies to

Data ONTAP 7-Mode

Issue

Generic performance issues, NFS disconnection or timeouts may be experienced by NFS clients in relation to a mechanism called NFS Input Flow control.

If the NetApp storage controller resets an NFS TCP session, a message similar to the following is reported in the storage controller logs:

Shutting down idle connection to client (x.x.x.x) where receive side flow control has been enabled. There are X bytes in the receive buffer.

Note: This feature is completely different from Ethernet flow control which utilizes pause frames.

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