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Cisco Bug: CSCvj32984 - Unexpected network credit depletion disrupts FC storage traffic

Last Modified

Sep 19, 2018

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

3.2(3a)B 3.2(3a)C 3.2(3b)B 3.2(3b)C

Description (partial)

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.

Related Community Discussions

<key>CSCvj32984</key> - VIC 1340 on 3.2(3a) utilizing FC Storage under high load hangs/halts OS
Hi,   I have seen a similar issue ( not exactly the same ) with one of our customers who is running on .3.2(2d) version, is that an affected version too?
Latest activity: May 24, 2018
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