[ovirt-users] oVIRT 4.1 / iSCSI Multipathing / Dell Compellent

[Devin Acosta]

I just installed a brand new Dell Compellent SAN for use with our oVIRT
4.1.3 fresh installation. I presented a LUN of 30TB to the cluster over
iSCSI 10G. I went into the Storage domain and added a new storage mount
called “dell-storage” and logged into each of the ports for the target. It
detects the targets just right and the Dell SAN is happy, until a host is
rebooted at which point the iSCSI seems to choose to log into only one of
the controllers and not all the paths that it originally logged into. At
this point the Dell SAN shows only 1/2 connected and therefore my e-mail.

When I looked at the original iscsiadm session information after initially
joining to domain it shows correct connected to (1f,21,1e,20) ports.



tcp: [11] 10.4.77.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1f
(non-flash)
tcp: [12] 10.4.77.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe21
(non-flash)
tcp: [13] 10.4.78.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1e
(non-flash)
tcp: [14] 10.4.78.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe20
(non-flash)
tcp: [15] 10.4.77.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1f
(non-flash)
tcp: [16] 10.4.78.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1e
(non-flash)

After I reboot the hypervisor and it re-connects to the cluster it shows:

tcp: [1] 10.4.78.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1e
(non-flash)

tcp: [2] 10.4.78.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1e
(non-flash)

tcp: [3] 10.4.77.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1f
(non-flash)

tcp: [4] 10.4.77.100:3260,0 iqn.2002-03.com.compellent:5000d310013dfe1f
(non-flash)

What is bizarre is it shows multiple connections to the same IP but it
shows 2 connections to 1e, and 2 connections to 1f. It seems to selected
only the top controller on each fault domain and not the bottom controller
also.

I did configure a “bond” inside the iSCSI Multipathing of selecting only
the 2 VLANS together for the iSCSI. I didn’t select a target with it
because wasn’t sure the proper configuration for this. If I selected both
virtual and target port the cluster goes down hard.

Any ideas?

Devin Acosta
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20170711/7e7eb296/attachment.html>