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November 14th, 2012 05:00
CX3-20 and Open-E (No MultiPath)
Scenerio:
Open-E doesnt currently have the option to have multipath on its initatior portion (This is a bug and it is getting fixed something early next year). in lieu of this I am attempting to setup each NICs (4 total) to 4 differant ISCSI ports on the CX3-20, and than create a storage group for each NIC with unique LUNS on each. I have been having issues going this route because of only 1 host is allowed per storage group, I know I can attach multiple LUN per group but Open-E see's each LUN as a unique LUN and doesnt combine despite having the same ID's.
I want to make sure there isnt a way to manually register based on IP and bybass the host name portion.
Example:
Nic 1 --> SPA Eth0 (Lun 1-4)
NIC 2 --> SPA Eth3 (Lun 5-9)
Nic 3 --> SPB Eth0 (Lun 10-14)
Nic 4 --> SPB Eth3 (Lun 15-19)
Thanks for your help.
dynamox
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November 14th, 2012 08:00
i see what you are trying to do. Hmm ..typically with software iSCSI initiator there is only one IQN per host so unless you can get Open-E to assign unique IQN to each NIC, CX3 will think it's the same host and not allow you register it as unique host because it already knows about that IQN and has already registered as another host name. CX wants to treat this as multipathing solution where you are trying to do exactly the opposite. Is Open-E some flavor of Linux/Open BSD ?
dynamox
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November 14th, 2012 06:00
so you have a unique IP assign to each NIC, i would think you should be able to manually register each NIC and assign a "bogus but unique" host name to each initiator.
RVOpsSmith
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November 14th, 2012 07:00
The idea is not to have multipath, Open-E doesnt have that ability on there end. If I attached all the LUNs it would get confused and think that each LUN is a unique HDD, so instead of 5 LUNs on 4 nics it would be 20 LUNS. Instead I was hoping that I can get each LUN to only go down a certain path, knowing if I loose a nic I will loose that set of LUNS. This will be part of an active\active scenerio so I would just flip over to another host.
Thank you for your help with this, a little confusing - not sure if anyone has done this before.
RVOpsSmith
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November 14th, 2012 07:00
When I tried to manually created the connection, I tried creating a bogus initiator. When I went to open-e and connected to the ISCSI port (a differant IP) EMC said it was the same server names as my other connector. On Open-E I am only allowed to have 1 hostname for the ISCSI portion, I was wondering if this is tied into the protocol for ISCSI and it keeps passing this information over.
Maybe I am not doing what you suggested correctly.
In this scene is the hosts the system thinks is there.
In this scene, I created an initiator named rv-atl-vstore02-nic8 but I am unable to get the host to get logged in under that one, instead it feels it must register with the hostname.
dynamox
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November 14th, 2012 07:00
i just re-read your previous post
so even if you were able to get each NIC to login to the array and registered as unique host and then present 4 different LUNs. That's not going to give you any multipathing per LUN, sorry if i am missing what you are trying to accomplish here.
RVOpsSmith
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November 14th, 2012 08:00
That you for the information. Open-E is a flavor of linux, however it is locked tight and the no way to modify it. They have plans to add multipath (is native to linux) but it will be sometime. I came to the same thought pattern as you but wanted to comfirm.
Thank you for your thoughts.