Open Stack

Regarding the cleanup in detach, I found that the python-os-brick package
in Ubuntu 16 is rather old: 1.2.0

I found that the function find_multipath_device
in os_brick/initiator/linuxscsi.py was refactored her
https://github.com/openstack/os-brick/commit/3ea86f7d605d7109f4e13c1566ba1a14dc856443

I partially applied those changes and could make it work (clean up)





On Fri, Aug 12, 2016 at 5:47 PM, Gustavo Randich <gustavo.randich at gmail.com>
wrote:

> Hi,
>
> Is someone using iscsi multipath in Ubuntu 16 / Mitaka? Things that work
> OK for us in Ubuntu 14 / Icehouse seem to be broken.
>
> Basically, the WWID of the volume is not automatically placed in
> /etc/multipath/wwids, and if we add it manually, we can attach with
> multipath, but the detach never cleans up iscsi sessions nor device mapper
> multipath maps.
>
> (using multipath-tools 0.5.0+git1.656f8865-5ubuntu2.1, and only one path
> for testing purposes)
>
>
>
> - first attach, gives "can't get udev device" error ->
> https://bugs.launchpad.net/os-brick/+bug/1585940
>
>           Failed to execute command multipath -l
> /dev/disk/by-path/ip-10.167.15.101:3260-iscsi-iqn.1992-08.co
> m.netapp:sn.1873815289-lun-0
>
> root at dev-e01-host07:~# multipath -l /dev/disk/by-path/ip-10.167.15.101:
> 3260-iscsi-iqn.1992-08.com.netapp:sn.1873815289-lun-0
> Aug 12 15:38:30 | ip-10.167.15.101:3260-iscsi-iq
> n.1992-08.com.netapp:sn.1873815289-lun-0: can't get udev device
>
>
> - once patched, we get a non-multipath attach: in nova-compute.log we see
> "couldn't find a valid multipath device path for <id>"
>
>        issuing "multipath -v3", we get "wwid <id> not in wwids file,
> skipping <device>"
>
> root at dev-e01-host07:~# multipath -v3
> Aug 12 15:39:47 | libdevmapper version 1.02.110 (2015-10-30)
> Aug 12 15:39:47 | DM multipath kernel driver v1.11.0
> Aug 12 15:39:47 | sdb: prio = ontap controller setting)
> Aug 12 15:39:47 | sdb: prio args = "" controller setting)
> Aug 12 15:39:47 | sdb: ontap prio = 2
> ...
> ...
> Aug 12 15:39:47 | dm-0: blacklisted, udev property missing
> ===== paths list =====
> uuid                              hcil    dev dev_t pri dm_st chk_st
> vend/prod
> 360a9800041763061792b492f4e564179 3:0:0:0 sdb 8:16  2   undef faulty
> NETAPP,LU
> *Aug 12 15:39:47 | wwid 360a9800041763061792b492f4e564179 not in wwids
> file, skipping sdb*
> Aug 12 15:39:47 | sdb: orphan path, only one path
> Aug 12 15:39:47 | ontap prioritizer refcount 1
> Aug 12 15:39:47 | tur checker refcount 1
>
>
> - if we manually add the WWID to /etc/multipath/wwids, the attach is done
> with multipath:
>
> root at dev-e01-host07:~# virsh domblklist 10
> Target     Source
> ------------------------------------------------
> vda        /var/lib/nova/instances/8440e7a8-92d9-448d-ac17-
> 5f04f032849c/disk
> vdb        /dev/disk/by-id/dm-uuid-mpath-360a9800041763061792b492f4e564230
>
> root at dev-e01-host07:~# multipath -ll
> 360a9800041763061792b492f4e564230 dm-1 NETAPP,LUN
> size=1.0G features='2 queue_if_no_path retain_attached_hw_handler'
> hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=2 status=active
>   `- 3:0:0:0 sdb 8:16 active ready running
>
>
> - but the detach operation doesn't remove the multipath map and doesn't
> logout of iscsi sessions
>
> [1]+  Done                    nova volume-detach 8440e7a8-92d9-448d-ac17-5f04f032849c
> 2f717d41-894d-472a-851c-aaa03b593364
>
> root at dev-e01-host07:~# multipath -ll
> 360a9800041763061792b492f4e564230 dm-1 ##,##
> size=1.0G features='2 queue_if_no_path retain_attached_hw_handler'
> hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=0 status=enabled
>   `- #:#:#:# sdb 8:16 failed undef running
>
> root at dev-e01-host07:~# iscsiadm -m session
> tcp: [2] 10.167.15.101:3260,2000 iqn.1992-08.com.netapp:sn.1873815289
> (non-flash)
>
>
>
> in nova-compute.log, we see "Couldn't find multipath device /dev/mapper/
> 360a9800041763061792b492f4e564230"
>
>
>
> instance: 8440e7a8-92d9-448d-ac17-5f04f032849c] Detach volume
> 951264a3-19d9-4f7e-8bbb-a2eabdcae044 from mountpoint /dev/vdb
>  -] Generated XML ('<disk type="block" device="disk">\n  <driver
> name="qemu" type="raw" cache="none" io="native"/>\n  <source
> dev="/dev/disk/by-id/dm-uuid-mpath-360a9
>  -] Waiting for function nova.virt.libvirt.guest._do_wait_and_retry_detach
> to return. func /usr/lib/python2.7/dist-packages/oslo_service/
> loopingcall.py:384
> 83 - - -] calling os-brick to detach iSCSI Volume disconnect_volume
> /usr/lib/python2.7/dist-packages/nova/virt/libvirt/volume/iscsi.py:95
>  - -] Lock "connect_volume" acquired by "os_brick.initiator.connector.disconnect_volume"
> :: waited 0.000s inner /usr/lib/python2.7/dist-
> packages/oslo_concurrency/lock
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf multipath -r execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processutils.py:3
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf multipath -r"
> returned: 0 in 0.167s execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processutils.py
>  - - -] multipath ['-r']: stdout=reload: 360a9800041763061792b492f4e564230
> undef NETAPP,LUN#012size=1.0G features='1 queue_if_no_path' hwhandler='0'
> wp=undef#012`-+-
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf multipath -ll /dev/sdb execute
> /usr/lib/python2.7/dist-packages/oslo_concurrency/process
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf multipath -ll
> /dev/sdb" returned: 0 in 0.191s execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/proce
>  - - -] multipath ['-ll', u'/dev/sdb']: stdout=
> 360a9800041763061792b492f4e564230 dm-1 NETAPP,LUN#012size=1.0G
> features='2 queue_if_no_path retain_attached_hw_handler'
>  - - -] remove multipath device /dev/sdb remove_multipath_device
> /usr/lib/python2.7/dist-packages/os_brick/initiator/linuxscsi.py:123
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf multipath -l /dev/sdb execute
> /usr/lib/python2.7/dist-packages/oslo_concurrency/processu
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf multipath -l
> /dev/sdb" returned: 0 in 0.156s execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/proces
> 83 - - -] Couldn't find multipath device /dev/mapper/
> 360a9800041763061792b492f4e564230
>  - - -] Disconnect multipath device /dev/mapper/
> 360a9800041763061792b492f4e564230 _disconnect_volume_multipath_iscsi
> /usr/lib/python2.7/dist-packages/os_brick/initiat
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf multipath -ll execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processutils.py:
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf multipath -ll"
> returned: 0 in 0.158s execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processutils.p
>  - - -] multipath ['-ll']: stdout=360a9800041763061792b492f4e564230 dm-1
> NETAPP,LUN#012size=1.0G features='2 queue_if_no_path
> retain_attached_hw_handler' hwhandler='0
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf iscsiadm -m discovery -t sendtargets -p
> 10.167.15.101:3260 execute /usr/lib/python2.7/di
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf iscsiadm -m
> discovery -t sendtargets -p 10.167.15.101:3260" returned: 0 in 0.168s
> execute /usr/lib/python2.7/
>  - - -] iscsiadm ['-m', 'discovery', '-t', 'sendtargets', '-p',
> u'10.167.15.101:3260']: stdout=10.167.15.101:3260,2000
> iqn.1992-08.com.netapp:sn.1873815289#012 stderr
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf multipath -r execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processutils.py:3
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf multipath -r"
> returned: 0 in 0.165s execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processutils.py
>  - - -] multipath ['-r']: stdout=reload: 360a9800041763061792b492f4e564230
> undef NETAPP,LUN#012size=1.0G features='1 queue_if_no_path' hwhandler='0'
> wp=undef#012`-+-
>  - -] Lock "connect_volume" released by "os_brick.initiator.connector.disconnect_volume"
> :: held 1.022s inner /usr/lib/python2.7/dist-packages/oslo_concurrency/
> lockut
> 83 - - -] Disconnected iSCSI Volume vdb disconnect_volume
> /usr/lib/python2.7/dist-packages/nova/virt/libvirt/volume/iscsi.py:101
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf cat /etc/iscsi/initiatorname.iscsi execute
> /usr/lib/python2.7/dist-packages/oslo_concurr
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf cat
> /etc/iscsi/initiatorname.iscsi" returned: 0 in 0.186s execute
> /usr/lib/python2.7/dist-packages/oslo_concu
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf systool -c fc_host -v execute
> /usr/lib/python2.7/dist-packages/oslo_concurrency/processu
> 3 - - -] CMD "sudo nova-rootwrap /etc/nova/rootwrap.conf systool -c
> fc_host -v" returned: 96 in 0.140s execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/proce
> 3 - - -] u'sudo nova-rootwrap /etc/nova/rootwrap.conf systool -c fc_host
> -v' failed. Not Retrying. execute /usr/lib/python2.7/dist-
> packages/oslo_concurrency/processut
>  - - -] systool is not installed
> 3 - - -] Running cmd (subprocess): sudo nova-rootwrap
> /etc/nova/rootwrap.conf systool -c fc_host -v execute
> /usr/lib/python2.7/dist-packages/oslo_concurrency/processu
>
>
>
> Any idea of what could be happening?
>
> Thanks
>
>
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