Question

How do you specify a LUN for a HP MSA 2012i iSCSI SAN when attaching a host

Asked by: IX_LongBow

I created a second volume on my HP MSA 2012i iSCSI SAN and can't attach a host. My first volume I attached the host without specifying a LUN. I just mapped the hosts on the MSA to the volume. I mapped this new host to the new Volume which is LUN 1, and the Qlogic sansurfer shows the HBA has a session, but I can't see the volume in computer management on the w2k3 server.

One strange thing about the MSA is you see the iqn in the management console, but need to append .a or .b depending on the controller. I only have one controller, so I specified .a, but how do I tell the host it's LUN 1? Is the host supposed to pickup the LUN 1 because the MSA has it mapped to the volume? I tried .a.1 at the end of the iqn, no luck.

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Asked On
2009-08-31 at 05:49:35ID24694554
Topics

Networking Security Vulnerabilities

,

Storage Technology

,

Hard Drives & Storage

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: andyalderPosted on 2009-09-01 at 06:41:23ID: 25231452

Are you using the advanced option of creating the volume off-line and then presenting it to the host or using the default of background initialisation?

If you're using background initialization it can take ages for it to show up, at least with the software initiator. You can log onto the IQN but you can't see any disk device properly until it's completed initialising. I therefore only use the default background method for testing using RAID 0 which doesn't do any background parity scrubbing since it's not valid for RAID0 and the volume is ready in a couple of minutes.

 

by: IX_LongBowPosted on 2009-09-01 at 07:09:01ID: 25231715

Thanks for the response. What seems to have happened, although I don't know why is when I created my new Vdisk on the MSA, it assigned the controller B as the owner. I don't have a second controller B. SO My host couldn't see it. I had to manually set controller A as the owner, which removed the lun assignment. Why there is no GUI option to set the LUN I don't know. I couldn't find it. I removed and recreated the volume, assigned LUN 1 and rescanned on my host. It found the LUN and I was able to access the volume. Thanks.

 

by: andyalderPosted on 2009-09-01 at 07:24:04ID: 25231863

There's a technote on that issue but I didn't realise you created a new Vdisk, just thought you created another volume on the initial vDisk.

Default ownership of Vdisks is in a round robin basis, every other one is owned by your non-existant second controller.

 

by: IX_LongBowPosted on 2009-09-02 at 06:31:00ID: 25240805

Ok andyalder, thanks for the help. If you put the link to the technote in here I'll be happy to assign the points.

 

by: andyalderPosted on 2009-09-02 at 07:31:57ID: 25241444

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