SAN with multiple interfaces in the same subnet

2010-10-04 Thread JonathanGnagy
I've got an iSCSI SAN with two controllers (IBM DS3300). Both
controllers are in the same subnet (lets say 192.168.0.0/24). I have
the same targets / nodes with the same IQN available on both
controllers (lets say 192.168.0.2 and 192.168.0.3), but I've only
figured out how to attach my servers (running CentOS 5.5) to attach to
one controller at a time. I'm not using any authentication or
anything, and when I run discover, I see both portals. I'd like iscsid
on the servers to either load-balance or fail over from one to the
other, but it's not working that way. How can I make this work?

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Re: SAN with multiple interfaces in the same subnet

2010-10-04 Thread Mike Christie

On 10/01/2010 04:28 PM, JonathanGnagy wrote:

I've got an iSCSI SAN with two controllers (IBM DS3300). Both
controllers are in the same subnet (lets say 192.168.0.0/24). I have
the same targets / nodes with the same IQN available on both
controllers (lets say 192.168.0.2 and 192.168.0.3), but I've only
figured out how to attach my servers (running CentOS 5.5) to attach to
one controller at a time. I'm not using any authentication or
anything, and when I run discover, I see both portals. I'd like iscsid
on the servers to either load-balance or fail over from one to the
other, but it's not working that way. How can I make this work?


There is not iscsi level multipath. You have to log into both portals, 
then use something like dm-multipath and multipath-tools (in RHEL the 
rpms is called device-mapper-multipath-tools) to load balance or 
failover across the iscsi paths.


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