Hello Xing and all, We tried to set up iSCSI multipath with EMC VNX5300. However, we had some problems with setting the iSCSI multipath with EMC VNX5300. So, we analyzed the logs and source codes, and found out that nova-compute (cinder-volume also same) is using a single iSCSI target(IQN) for login to multiple (different) portal IP addresses. VNX5300 has multiple iSCSI ports with different iSCSI target (IQN)s. (Normally it should use a different iSCSI target(IQN) for each IP address.)
So, we realized that, iSCSI multipath cannot be configured with VNX5300. But we would like to use iSCSI multipath with EMC VNX5300. Regards, Takashi Natsume NTT Software Innovation Center Tel: +81-422-59-4399 E-mail: natsume.taka...@lab.ntt.co.jp From: yang, xing [mailto:xing.y...@emc.com] Sent: Friday, November 22, 2013 7:25 AM To: Carlos Alvarez; openstack@lists.openstack.org Subject: Re: [Openstack] multipath - EMC vs NetApp Hi Carlos, We are working on this issue and will keep you informed. Thanks, Xing From: Carlos Alvarez [mailto:cbalva...@gmail.com] Sent: Monday, November 18, 2013 1:19 PM To: openstack@lists.openstack.org Subject: [Openstack] multipath - EMC vs NetApp Hi All. I recently added a EMC V-Max storage system, and realized the multipath is not working. The device is called /dev/mapper/XXXX but when I see the multipath -ll output, I see just one path. It is working fine with a NetApp 3250. Looking into differences, I see the output of the iscsiadm discovery differs: Netapp output: root@grizzly-dev04:~# iscsiadm -m discovery -t sendtargets -p 10.33.5.10 10.33.5.10:3260,1030 iqn.1992-08.com.netapp:sn.0e3c22d9f2ea11e2a2f2123478563412:vs.10 10.33.5.11:3260,1031 iqn.1992-08.com.netapp:sn.0e3c22d9f2ea11e2a2f2123478563412:vs.10 Emc output: root@grizzly-dev04:~# iscsiadm -m discovery -t sendtargets -p 10.33.5.25 10.33.5.25:3260,1 iqn.1992-04.com.emc:50000973f00bcd44 Looking into the code, the former is clearly what the connect_volume method is expecting: a single ip which returns both path. I reported it to EMC and the answer is that it works with netapp because the 3250 has a feature EMC lacks (called multipath groups). Is anybody using multipath with a V-Max?. It should work or EMC is not supported? Thanks! Carlos _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
