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Bug 31936491 ZFS Storage Appliance Shares Report "NFS Server not responding" and the Appliance Only Responds with Empty TCP ACKs. (Doc ID 2722009.1)

Last updated on DECEMBER 14, 2022

Applies to:

Sun ZFS Storage 7120 - Version All Versions and later
Oracle ZFS Storage ZS3-BA - Version All Versions and later
Oracle ZFS Storage ZS4-4 - Version All Versions and later
Oracle ZFS Storage Appliance Racked System ZS7-2 High-End - Version All Versions and later
Oracle ZFS Storage ZS7-2 Mid-Range - Version All Versions and later
7000 Appliance OS (Fishworks)


Shares from the ZFS Storage Appliance(ZFSSA) become unresponsive, causing clients to report "NFS Server not responding".
Not all clients or all mounts on an affected client are necessarily impacted.
Other clients may access the same share without issue.
Affected clients may be able to access other mount points from the same ZFSSA without issue.

This issue can be confirmed by collecting packet data (i.e. tcpdump, snoop, tshark, etc).
The packet data will show the client is sending NFS call retransmits endlessly, but the ZFSSA only responds with empty TCP ACKs.


Please note: The above is a summary of the symptoms and actual symptoms can vary. Matching any symptoms here does not confirm that you are encountering this exact issue. For additional questions regarding this issue, please contact Oracle Support.


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