Pkg xen devel - Jul 2013 - Bug#717573: XCP: Cannot connect to iSCSI target

Package: xcp-storage-managers
Version: 0.1.1-3
Severity: normal

XCP cannot use iscsi block devices. Fails with iscsiadm: No active sessions.
I ran the following commands trying to diagnose the problem:

First introducing a SR and then creating a PBD with the needed configuration for
the iscsi block device. These steps work fine but when I tried to plug the PBD I
got the error:

root at xcpcompute1:~# SR_UUID=$(uuidgen)
root at xcpcompute1:~# SR_NAME_LABEL="Test-${SR_UUID}"
root at xcpcompute1:~# xe sr-introduce name-label=${SR_NAME_LABEL} type=iscsi
uuid=${SR_UUID}
43223068-01e5-4c3e-b9ff-0d33fa89fab8
root at xcpcompute1:~# . /etc/xcp/inventory
root at xcpcompute1:~# PBD_UUID=`xe pbd-create host-uuid=${INSTALLATION_UUID}
sr-uuid=${SR_UUID} device-config-target=192.168.200.51
device-config-targetIQN=iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c
device-config-port=3260`
root at xcpcompute1:~# xe pbd-plug uuid=${PBD_UUID}
The server failed to handle your request, due to an internal error.  The given
message may give details useful for debugging the problem.
message: Failure("Storage_access failed with: SR_BACKEND_FAILURE_202: [ ;
General backend error [opterr=rc: 21, stdout: , stderr: iscsiadm: No active
sessions.\n];  ]")


By running the iscsiadm -m session command, it looks like there are no active
sessions indeed:


root at xcpcompute1:~# iscsiadm -m session
iscsiadm: No active sessions.


Initiating a session manually and retrying to plug the PBD works:


root at xcpcompute1:~# iscsiadm -m discovery -t st -p 192.168.200.51 
192.168.200.51:3260,1
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c
root at xcpcompute1:~# iscsiadm -m node -p 192.168.200.51 -T
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c -l
Logging in to [iface: default, target:
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c, portal:
192.168.200.51,3260] (multiple)
Login to [iface: default, target:
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c, portal:
192.168.200.51,3260] successful.
root at xcpcompute1:~# iscsiadm -m session
tcp: [1] 192.168.200.51:3260,1
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c
root at xcpcompute1:~# xe pbd-plug uuid=${PBD_UUID}


But unplugging is not working again and fails with the same error:


root at xcpcompute1:~# xe pbd-unplug uuid=${PBD_UUID}
The server failed to handle your request, due to an internal error.  The given
message may give details useful for debugging the problem.
message: Failure("Storage_access failed with: SR_BACKEND_FAILURE_202: [ ;
General backend error [opterr=rc: 21, stdout: , stderr: iscsiadm: No active
sessions.\n];  ]")
root at xcpcompute1:~# iscsiadm -m session
iscsiadm: No active sessions.


I tried to login again manually to unplug the device but this only worked for
plugging. Not for unplugging. The only way I managed to unplug the PDB after it
was plugged, it was to stop the open-iscsi service.


root at xcpcompute1:~# iscsiadm -m node -p 192.168.200.51 -T
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c -l
Logging in to [iface: default, target:
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c, portal:
192.168.200.51,3260] (multiple)
Login to [iface: default, target:
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c, portal:
192.168.200.51,3260] successful.
root at xcpcompute1:~# iscsiadm -m session
tcp: [2] 192.168.200.51:3260,1
iqn.2010-10.org.openstack:volume-0cb7018c-abbb-46be-b746-113f8eaf0e5c
root at xcpcompute1:~# xe pbd-unplug uuid=${PBD_UUID}
The server failed to handle your request, due to an internal error.  The given
message may give details useful for debugging the problem.
message: Failure("Storage_access failed with: SR_BACKEND_FAILURE_202: [ ;
General backend error [opterr=rc: 21, stdout: , stderr: iscsiadm: No active
sessions.\n];  ]")
root at xcpcompute1:~# service open-iscsi stop
[ ok ] Unmounting iscsi-backed filesystems: Unmounting all devices marked
_netdev.
[....] Disconnecting iSCSI targets:iscsiadm: No matching sessions found
.. ok 
[ ok ] Stopping iSCSI initiator service:.
root at xcpcompute1:~# xe pbd-unplug uuid=${PBD_UUID}
root at xcpcompute1:~# echo $?
0


It looks like the iscsiadm commands executed by xcp cannot login to the iSCSI
target but they can succesfully terminate the sessions.


-- System Information:
Debian Release: 7.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages xcp-storage-managers depends on:
ii  blktap-utils    2.0.90-1
ii  libc6           2.13-38
ii  libxenstore3.0  4.1.4-3+deb7u1
ii  open-iscsi      2.0.873-3
ii  python          2.7.3-4
ii  python2.7       2.7.3-6
ii  sg3-utils       1.33-1
ii  uuid-runtime    2.20.1-5.3

Versions of packages xcp-storage-managers recommends:
ii  lvm2        2.02.95-7
ii  nfs-common  1:1.2.6-4

xcp-storage-managers suggests no packages.

-- no debconf information

Your message dated Sun, 02 Mar 2014 19:00:36 +0000
with message-id <E1WKBcq-0006Yn-2Y at franck.debian.org>
and subject line Bug#740515: Removed package(s) from unstable
has caused the Debian Bug report #717573,
regarding XCP: Cannot connect to iSCSI target
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
717573: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717573
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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