vdsm_patch

# cat /etc/vdsm/vdsm.conf 
# Auto-generated by vds_bootstrap at:2013-11-06 16:56:49.310410

[vars]
trust_store_path = /etc/pki/vdsm
ssl=true

[irs]
iscsi_default_ifaces = eth1,eth2    <----- Interfaces to be used for multipath

[addresses]
management_port=54321



vdsm.log:

Thread-41::DEBUG::2013-11-12 13:48:52,390::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface -I eth1 --op=new' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:52,429::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface -I eth2 --op=new' (cwd None)

- ifaces created ^^^

Thread-41::DEBUG::2013-11-12 13:48:52,403::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -I eth1 -p 192.168.25.118:3260,1 --op=new' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:52,442::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -I eth2 -p 192.168.25.118:3260,1 --op=new' (cwd None)

- nodes created ^^^

Thread-41::DEBUG::2013-11-12 13:48:52,456::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:52,468::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -I eth1 -p 192.168.25.118:3260,1 -l' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:53,138::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:53,164::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -I eth2 -p 192.168.25.118:3260,1 -l' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:53,818::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:53,856::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -I eth1 -p 192.168.25.118:3260,1 -n node.startup -v manual --op=update' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:53,869::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface' (cwd None)
Thread-41::DEBUG::2013-11-12 13:48:53,890::misc::83::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -I eth2 -p 192.168.25.118:3260,1 -n node.startup -v manual --op=update' (cwd None)

- login working as expected ^^^



[root@rhevm30 iscsi]# pwd
/var/lib/iscsi

[root@rhevm30 iscsi]# tree
.
|-- ifaces 
|   |-- eth1   <-------
|   `-- eth2   <-------
|-- nodes
|   `-- iqn.2012-07.com.lenovoemc:storage.ix2-73.teste1
|       `-- 192.168.25.118,3260,1
|           |-- eth1
|           `-- eth2
|-- send_targets
`-- static
    |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.teste1,192.168.25.118,3260,1,eth1 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.teste1/192.168.25.118,3260,1   <-------
    `-- iqn.2012-07.com.lenovoemc:storage.ix2-73.teste1,192.168.25.118,3260,1,eth2 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.teste1/192.168.25.118,3260,1   <-------

8 directories, 4 files

[root@rhevm30 iscsi]# multipath -ll
35005907f7a7ab6d0 dm-2 LENOVO,LIFELINE-DISK
size=50G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active            <------- Active path
| `- 5:0:0:0 sda 8:0   active ready running
`-+- policy='round-robin 0' prio=1 status=enabled           <------- Fail over path
  `- 6:0:0:0 sdb 8:16  active ready running

won't the requirement to use specific NIC names be a problem with scalability? I'd try to check all the nics for the ability to ping the iscsi portal or run discovery against it, and autopopulate the list.

hmmm, each hyp should have its own 'iscsi_default_ifaces' entry defining the interfaces which can reach the target ..

@dan, I believe user may not want to login to target using all his nics automatically, rather a list of nics which he prefer to find a path ..

the NICs that can't reach the portal won't be able to login and can be filtered out.