Bug 969759

Created attachment 755767 [details]
## Logs rhevm, vdsm, libvirt, thread dump, superVdsm

Description of problem: Failed create a first iSCSI Storage Domain, because host hold iSCSI session to old targets

Version-Release number of selected component (if applicable):
RHEVM 3.2 - SF17.1 environment: 

RHEVM: rhevm-3.2.0-11.28.el6ev.noarch 
VDSM: vdsm-4.10.2-21.0.el6ev.x86_64 
LIBVIRT: libvirt-0.10.2-18.el6_4.5.x86_64 
QEMU & KVM: qemu-kvm-rhev-0.12.1.2-2.355.el6_4.3.x86_64 
SANLOCK: sanlock-2.6-2.el6.x86_64

How reproducible:
100%

Depend on BZ969756

Steps to Reproduce:
1. Create iSCSI DC with 50 hosts (in my case 50 fake hosts) connected to 9 Storage Domain, when each one consisted of 8 PV's 
2. All host in “up” state, and all SD in “Active” state
3. Maintenance all 50 hosts (no problem with thread are found)
4. All host in “Maintenance” state
5. Attached all hosts to new iSCSI DC
6. Activate all host
7. All host in “up” state
8. Try create a first SD
  
Actual results:
Failed create first SD.
This happens because, in step 3, some hosts (on 6 from 50) hold iSCSI session to old targets

Expected results:
1. Succeed create first SD
2. Block create  first SD action some host hold iSCSI session to old targets
3. Get warning message in UI, and logs

Impact on user:

Workaround:
Manually disconnect from iSCSI target
    iscsiadm -m session -u
    iscsiadm -m node -o delete

Additional info:

/var/log/ovirt-engine/engine.log

/var/log/vdsm/vdsm.log