Cabling and MD3000i to two ESXi servers

I am having difficulty cabling the MD3000i to my 2 ESXi servers using iSCSI.  I have two switches.. help
evanbrownAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I assume you mean two physical switches....

see also here

https://techworldtech.wordpress.com/2013/09/20/deployment-guide-for-md3200imd3600i-for-vmware-esxi-5-0/

you will want to have your two switches configured in a STACK.

and then have a paths from both ESXi Server, to both switches, an interface connected from the MD3000i to both physical switches.

This configuration will prevent you have a single point of failure.

and then configure ESXi with Jumbo Frames, and iSCSI as follows:-

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0

HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client

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andyalderSaggar maker's framemakerCommented:
Dell do not recommend two switches in a stack, google for "IP-SAN-BEST-PRACTICE-wp" . They recommend two separate subnets, two separate / redundant switches.

The danger of using stacking switches is  the same as the danger of using two fibre channel switches in a single fabric - a configuration error can blow both out of the water at the same time.

https://www.google.com/search?q=IP-SAN-BEST-PRACTICE-wp&ie=utf-8&oe=utf-8 (first link) for the white paper - I can't post links to PDFs easily.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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andyalderSaggar maker's framemakerCommented:
The Wordpress link you posted also does not have the switches in a stack. I wonder why you suggested it (in capitals) when it just adds cost and reduces redundancy over two separate switches?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
because that's what Dell told us! after our last Dell Inspection and Audit, by their storage team!

(and when asked the question or stack versus non-stack, they non-stack was stated  as it was for ease, because their customers were not Network Experts that could not stack switches - but recommended to stack!)

I have a document somewhere from their Support team!

Our stack, does not fall over, when mis-configured, or we lose a switch from it, and these are Dell switches!
andyalderSaggar maker's framemakerCommented:
So! you're! saying that! if you upload! a configuration! to the stack that's full of! shutdown interfaces! it does not! fall over!
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Just repeating what Dell have said....

why would you do that? unless an idiot is in charge....

which is also like saying sending a shutdown to both heads at the same time, to an EVA!

that's also like say, if you issued a command "off" to the datacenter ?
andyalderSaggar maker's framemakerCommented:
>why would you do that?

To test out your statement that the stack does not fall over when mis-configured.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
anything can fail when an idiot mis-configures it!

and if you send an OFF to the datacentre, that will also fail!
andyalderSaggar maker's framemakerCommented:
Two separate switches are unlikely to fail at once even if an idiot mis-configures them since after breaking one all sorts of alarms go off. It doesn't even take an idiot, dodgy firmware can be uploaded with good intent and with a stack that firmware will propagate to all members. No doubt you remember HP's firmware that bricked the network chips last year.
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