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VMware Datastore Policies

Posted on 2014-04-01
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Last Modified: 2014-04-02
Hey all,

I believe I have multipath configured correctly.

I have two ESX nodes running VMware 4.1 and an HP P2000.

When I go into the datastore and select multipath, I have it configured for Round Robin.

I see 4 paths. 2 say Active (I/O) and 2 just say Active.

The 2 Active (I/O) are my first controller. And the two that just say Active are my second controller. I am guessing this is an Active/Active SAN but only one controller can do I/O (own the LUN) at once.

Is this correct? Or should all 4 be Active (I/O)?

Or, should the (I/O) be split across the two controllers?

Thanks!
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Question by:Gareth Gudger
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 39971025
are different LUNs owned by different controllers?

depending upon how many paths you have, you would expect all to be Active (I/O).

if this is iSCSI, have you configured multipath as per my EE Article

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 4.1
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by:Gareth Gudger
ID: 39971039
Yes, it is iSCSI sorry.

I looked over your document. I didn't do the last step #7.

Would that cause symptoms like the above. Where 4 are Active, but only 2, from one controller, show (I/O)?
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LVL 124
ID: 39971511
if you did not do the last steps, iSCSI traffic will not be leaving both nics!

multipath policy or networking, is not setup correctly.
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LVL 31

Author Comment

by:Gareth Gudger
ID: 39972468
Hmm. Forgot to mention I am on VMware 4.1. So I was using the vmkiscsi -V -a command. Not sure if that matters.

I ran this and it said it was successful. I refreshed everything in the GUI. I know have four additional paths. 8 total now.

4 show Active (I/O) but all go to the same controller.
4 others show just Active and go to the second controller.

For my second LUN, its the same thing, just reversed. So controller A is Active (I/O) for one LUN and controller B is Active (I/O) for the other.

Could it be a storage issue?
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LVL 124
ID: 39972523
Okay, that would seem normal if one controller owns one LUN, and the other controller owns the other LUN. (which is how you would spread the load between controllers, in LUN ownership, so LUNs are equally owned between controllers)

if you fail a controller, what happens?
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Author Comment

by:Gareth Gudger
ID: 39973269
Yea, I found an HP document that has a screenshot of exactly how mine looks. So I guess I am good. Thanks for answering.
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LVL 124
ID: 39973589
that's not a problem.
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