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Question on presenting LUNS in VMware from EMC

Posted on 2011-03-24
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Last Modified: 2012-05-11
Hello all. I am pretty new to VMware ESI 4.1 so this question will be basic to you. Class didn't do a good job of telling us how to do this. I don't have a lab so I will have to take your suggestions and work through them a little at a time.

We have a EMC CX4 and are implmenting a VMware 4.1 environment. I have the SAN experience but am just a little confused as to how to present the new LUNS to the hosts. Maybe I'm not typing in the correct search word in Google or something. DRS. I might still be looking at this from the SAN admins viewpoint, but here's my question.

We are going to be running three hosts with a vcenter server in a DRS setup. All the hosts will have fiber HBA's that attach to our EMC CX4. On a physical server, I would zone it, create a LUN and drop it in the storage group for the server. I'd then do a scan on the server and the lun would show up. Just for that server.

However, how do I do that for a cluster of VM Hosts? How do I create LUNS so if a host fails the other hosts in the cluster will see it. Do I drop all the hosts in the same Storage group in the EMC and then present the LUNS? Seems odd to me to do that. I'm confused because normally when I zone a physical box then nothing else see's the LUN I create except that host. How do I make it so all the hosts can see the datastore?
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Question by:haasjoh
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Expert Comment

by:Luciano Patrão
ID: 35210809
Hi

It doesn't mater if a VMware Cluster or not. It the same task for any VMware configuration.

You just need to create VD disk in the EMC side, create a LUN, present the LUNs to the hosts that will work with that LUNs. Create the zones for that configuration, and the LUNs will be added into the VMware Storage datastores.

Will all host see the same LUNs? If is a VMware Cluster(HA or DRS) then yes, you need to present the LUNs to all VMware hosts.

After you set this in the EMC in VMware side, you need to add a Storage to the VMware. Choose add Storage and this will pop up your LUNs.

On the first host that you do this, you will need to format the LUNs, after this, in the other hosts just rescan All, and the LUNs will be present into that host.

Some articles about this:
http://kb.vmware.com/kb/1013500

You should also put the Storage Resignate  to 1 value using this command.

Enable Volume Resignaturing option to “1”

Hope this can help

Jail
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by:haasjoh
ID: 35210860
@ BestWay
You Said:

You just need to create VD disk in the EMC side, create a LUN, present the LUNs to the hosts that will work with that LUNs. Create the zones for that configuration, and the LUNs will be added into the VMware Storage datastores.

Ok. The "present the LUNs to the hosts" is what I'm wondering. Normally I will only add one host to a storage group on the EMC and present a lun to that storage group. But this makes it sound like I have to add all VMhosts to the same storage group? Just trying to get this clear in my head.

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Accepted Solution

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Luciano Patrão earned 125 total points
ID: 35211075
Hi

Yes you are correct. You need to present all host into that Storage group.

In Windows you only present on host, but here you put all the hosts that will see this LUNs.
You only need to format on the first time on the firs host, after this, the rest of the host will see that Datastores into the storage area.

If you are not comfortable with this, or have doughs, just create a storage group and create a small LUN to test it.

Steps:
After added all hosts into the storage group host add the LUN(add storage option in VMware). First time the VMware will ask to format the this LUN.  Choose your block size and ok.

 Add Storage
After this, in the second host(or third), you just need to Rescan the Storage, but also rescan the adapters just refresh

Refresh

Hope this can help

Jail
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LVL 2

Author Closing Comment

by:haasjoh
ID: 35234236
Thanks for all your help. By the way, can you palce a few web links on here so I can see where EMC/VM says to do it that way. I must be typing in my searches all jacked up.
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