Dell MD3200i duplex mode

I want to utilize the duplex mode.. I want the ability for a controller for fail and the other one become owner automatically.. And..  I want the ability to load balance across both controller for better I/O and throughput.  Isn't this the function of duplex mode?  I found the guide here http://static3.menstream.pl/dell/Upgrade_Duplex.pdf .  The guide seems straight forward, however, when connecting each iSCSI host/controller module to ESXi will I have to use multipathing?
gopher_49Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
gopher_49Author Commented:
What about redundant controllers?  I would like all of the above...
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
yes, connect them up, wire them up correctly, and configure as above.

The recommended mode of operation for a MD3200 is duplex mode.
10 Tips to Protect Your Business from Ransomware

Did you know that ransomware is the most widespread, destructive malware in the world today? It accounts for 39% of all security breaches, with ransomware gangsters projected to make $11.5B in profits from online extortion by 2019.

gopher_49Author Commented:
So.. Follow your guides and in addition to that enable duplex via the CLI?
gopher_49Author Commented:
Andrew,

The guide here: https://i.dell.com/sites/content/shared-content/data-sheets/en/Documents/PowerVault_MD_iSCSI_Deployment_Guide_for_VMware_ESX50_Server_Software.pdf is slightly different than yours.. You have a dedicated VMKernel for each iSCSI host controller port.  Each in a different subnet and VLAN.  I also have each on dedicated switches..  I enabled multi path via round robin, however, the md3200i storage manager only has one target connected to it.. But VMWare shows two available.  One being used.. And..  I only have one controller showing to be active in VMWare.  I already enabled duplex via the CLI on the md3200i.  What am I missing?  I assume I should have two sessions on the md3200i and VMWare showing two active sessions versus right now one is in standby.
gopher_49Author Commented:
okay.. I changed it to VMWare Fixed and now I have two targets Active..  I think I have it correct..  What do I need to review to assure?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
pull out cables from network interfaces!

turn off switches

you should still have datastores if all is working and multipathed with no failures!
gopher_49Author Commented:
There is a step on page 4 in the guide located below.  I changed the ownership from controller 0 to controller 1.  Is it supposed to toggle the owner or make them both the owner?  I'll test right now via unplugging for I don't have any live VMs on it.. Brb.

http://downloads.dell.com/manuals/common/powervault-md3200_user%27s%20guide3_en-us.pdf
gopher_49Author Commented:
It worked...  The preferred controller was 1 and it went to 0.  When I plugged the cable in it went back to 1 .  The folders on the datastore where present the entire time.  How do I know if it's load balancing?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's best if you've got live VMs, because if it's not correct it will fail.

paths should be Active (I/O) and multiple paths, you can also look at performance and networking.

but with nothing, you'll not see much traffic.
gopher_49Author Commented:
My used the configs found in the links below.. They are almost the same except you for each iSCSI host controller port you have a dedicated VMkernel/switch port group.. And..  A single NIC in each..  Since you have one from controller 0 and another from controller 1 there is no need to have 2 x NICs in the same VMKernel / vswitch port group unless you need dual redundancy..  It's already redundant.. I also used VMware fixed iSCSI paths..  That made both controller active.. I also enabled duplex mode.

The guide here: https://i.dell.com/sites/content/shared-content/data-sheets/en/Documents/PowerVault_MD_iSCSI_Deployment_Guide_for_VMware_ESX50_Server_Software.pdf is slightly different than yours.. You have a dedicated VMKernel for each iSCSI host controller port.  Each in a different subnet and VLAN.  I also have each on dedicated switches..  I enabled multi path via round robin, however, the md3200i storage manager only has one target connected to it.. But VMWare shows two available.  One being used.. And..  I only have one controller showing to be active in VMWare.  I already enabled duplex via the CLI on the md3200i.  What am I missing?  I assume I should have two sessions on the md3200i and VMWare showing two active sessions versus right now one is in standby.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, those links and articles are OLD, and how we used to setup iSCSI multipath. My EE Article shows best practice.

But what ever works for you.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Storage Hardware

From novice to tech pro — start learning today.