Cisco Bug: CSCvj32984 - Unexpected network credit depletion disrupts FC storage traffic
Jan 24, 2020
- Cisco Unified Computing System
Known Affected Releases
3.2(3a)B 3.2(3a)C 3.2(3b)B 3.2(3b)C
Symptom: Operating System logs have a large amount of persistent SCSI abort commands for FCID 0xffffffff Operating Systems utilizing remote FC / FCoE storage may hang Conditions: Any of the following: Cisco UCS VIC 1340 modular LOM (UCSB-MLOM-40G-03) Cisco UCS VIC 1380 mezzanine adapter (UCS-VIC-M83-8P) Cisco UCS VIC 1385 Dual Port 40Gb QSFP+ CAN (UCSC-PCIE-C40Q-03) Cisco UCS VIC 1387 Dual Port 40Gb QSFP CNA MLOM (UCSC-MLOM-C40Q-03) FC/FCoE Storage - significant traffic on FC LUNs VIC adapter firmware 4.2(3a) 4.2(3a) VIC firmware is included with the 3.2(3a) UCS B-Series and C-Series software bundles. 4.2(3a) VIC firmware is included with the 3.1(3a) and 3.1(3b) UCS Standalone C-Series bundles. Prior to hang/aborts we see an entry in VIC logs removing an FC mac address such as: mcp.vnic_dev vnic17 vnic_dev_addr_del 0e:fc:00:06:22:0a NO ABORTS are seen at the VIC level At the OS, in vmkernel logs we will see repeated aborts. All aborts while in this condition will show an FCID of 0xffffffff vmkernel: cpu33:397265)<7>fnic : 2 :: Abort Cmd called FCID 0xffffffff, LUN 0x1 TAG 5a flags 843 The host may hang and not recover without intervention. ESXi does NOT generate a PSOD.
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