Cisco Bug: CSCvi25922 - on cisco VIC driver versions 188.8.131.52 or higher TCP/NFS hangs are seen/found
Aug 13, 2019
- Cisco UCS Virtual Interface Card
Known Affected Releases
2.2(7b)C 2.2(7c)A 2.2(7c)B 2.2(7c)C 2.2(7d)C 2.2(7e)C 2.2(8a)C 2.2(8b)C 2.2(8c)A 2.2(8c)B 2.2(8c)C 2.2(8f)C 2.2(8g)C 3.1(1e)C 3.1(1g)C 3.1(1h)C 3.1(1k)C 3.1(1l)C 3.1(2b)C 3.1(2c)A 3.1(2c)B 3.1(2c)C 3.1(2e)C 3.1(2f)C 3.1(2g)C 3.1(2h)C 3.1(3a)C 3.1(3b)C 3.1(3c)A 3.1(3c)B 3.1(3c)C 3.2(1d)C
Symptom: On the SLES 12 server the settings for SACK and/or TCP_TIMESTAMPS have been disabled, or on the other end of the TCP conversation those settings are disabled. Conditions: under heavy tcp traffic load customers using NFS as a filesystem mount from time to time will run into nfs hangs/ TCP hang from the os.
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