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Paths not failed properly when unmapping virtual FC ports in VIOS
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Status in linux source package in Yakkety:
vios vfc unmap (vfcmap -vadapter vfchost0 -fcp) can result in no i/o being
retried nor device offline.
Linux ubuntu16 4.4.0-9136-generic #55-Ubuntu SMP Fri Aug 26 05:56:24 UTC 2016
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = Power8 LPAR
---Steps to Reproduce---
Ubuntu 16.10 lpar with two vfc adapters mapped to SAN Storage and configured
In vios do: vfcmap -vadapter vfchost0 -fcp (where vfchost0 maps to test
lpar). multipath -ll and lvm commands hang in linux lpar. tail
/var/log/message hangs sometimes. multipath doesn't see failing devices and
doesn't mark paths down.
.... the following patch fixes the problem, which is now upstream accepted in
the scsi tree as
("scsi: ibmvfc: Fix I/O hang when port is not mapped")
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