This document discusses three options for adding shared storage to a blade infrastructure: 1) a 1GbE iSCSI SAN which is easy and affordable but has lower performance, 2) a 10GbE iSCSI SAN which has better performance but higher costs, and 3) a fiber channel SAN which allows for longer distances but is the most expensive option. The document recommends using a storage area network to provide high availability, fault tolerance, live virtual machine migration and loading the hypervisor onto an SD card.
2. Shared Storage for Blades
“What’s the best way to add storage to
our current setup?”
Shared Storage for Virtualization
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3. Shared Storage for VT
Storage Area Network (SAN) Permits:
o High Availability (HA)
o Fault Tolerance (FT)
o Live vMotion
o Hypervisor Loaded onto SD Card
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4. Option 1
1GbE iSCSI SAN
o Easy
o Simple
o Affordable
Existing Network Connections
Existing Enclosure Interconnects
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5. Option 2
10GbE iSCSI SAN
Also Simple But…
Higher Cost
o Need Correct Mezzanine Cards
o Need 10GbE Enclosure Interconnects
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6. Option 3
Fiber Channel (FC) SAN
Longer Distances b/w SAN & Blades
Free From EMI
(Electromagnetic Interference)
Special Mezzanine Cards
Special Enclosure Interconnects
Most Expensive Option
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Hello and welcome to, ‘Attaching Storage to Blade Infrastructure.’
One question we often get from customers with blade infrastructures is, “What’s the best way to add storage to our current setup?”
We often get this question from customers moving to virtualization.
You need blades, or other physical server hosts, to have shared storage (or a SAN) in order to take advantage of popular features like High Availability, Fault Tolerance, and Live vMotion.
Shared storage also allows the hypervisor to be loaded onto an SD card, removing the need for hosts to have internal storage.
Moderator Interjection
Those virtualization features are definitely important. What’s one way you can add a SAN to blade infrastructure?
We’ll start with the easiest and simplest way to add a SAN, Amber.
Using a 1GbE iSCSI SAN is the most appropriate option for many IT pros out there.
Reason being is that most organizations already have the necessary network infrastructure in place so any additional cabling or switching would be affordable.
Specifically, many networks now use 1GbE connections.
And you can use the blade chassis’ interconnects that are 1GbE.
Moderator Interjection
What about a 10GbE option?
A 10GbE iSCSI SAN would also be a simple route, but keep in mind IT pros have to make sure the blades have the correct mezzanine cards.
Plus, the enclosure itself must have the proper interconnect in the back to deliver 10GbE connections to and from the blades.
Both of these things can make the 10GbE option pricier.
Moderator Interjection
Okay, I see. What about a Fiber Channel option?
Thanks, Amber. The last option I’ll cover is actually the Fiber Channel route.
A Fiber Channel SAN is a viable option for setups where there is a longer distance between the SAN and the blades you’re connecting to it.
Fiber Channel is also for IT pros that want a connection type that isn't vulnerable to EMI (or electromagnetic interference).
The setup is more complex because the blades connecting to a Fiber Channel SAN will need special mezz cards, and the chassis will need a special interconnect to allow for solid fiber connections.
Keep in mind Fiber Channel is the most expensive shared storage option as the Fiber SAN unit, switches, and cables cost more in the long run.
Moderator Wrap-up & Close
Thank you, Chad!
If you enjoyed this webinar, you’ll want to watch our 5-minute oldie but goodie “Virtual Clustering Quick Tips”
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