[Bug 190489] New: Native ISCSI - UNIT_ATTENTION with KVM

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http://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190489

            Bug ID: 190489
           Summary: Native ISCSI - UNIT_ATTENTION with KVM
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: harunaga at harunaga.ru

Problem with Native ISCIS for use with KVM hypervisor.
Reports KVM at startup:

vm: -drive
file=iscsi://192.168.0.200/iqn.2012-06.storage:target0/10,if=none,id=drive-virtio0,aio=native,cache=none:
iSCSI: Failed to connect to LUN : SENSE KEY:UNIT_ATTENTION(6)
ASCQ:(null)(0x2901)

Can run with the second or third attempt. After a successful run is no problem.
This problem is very serious obstacle, as a result of migration does not work
or autostart virtual machines (VM) after a reboot of the hypervisor.

Environment:
FreeBSD storage.oc.chics.ru 10.0-RELEASE-p3 FreeBSD 10.0-RELEASE-p3 #0: Tue May
13 18:31:10 UTC 2014    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

How-To-Repeat:
Add new LUN in /etc/ctl.conf, make 'service ctld reload'. Start KVM:

kvm -drive 'file=iscsi://<IP>/<TARGET>/<LUN>'

get error:
Failed to connect to LUN : SENSE KEY:UNIT_ATTENTION(6) ASCQ:(null)(0x2901)

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