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Shared Storage Pools - As you know, Virtual Machines are comprised of files and in order to leverage the dynamic management features in VMware like HA, VMotion, etc these files must reside on a shared storage architecture. Shared Storage Pools are where one stores the majority of their Virtual Machines and have management implications.
FC – PROS: Communicates over a dedicated path and are not at risk of being overloaded. CONS: Cost FCoE – PROS: Unified Fabric saves money in port and cable reduction, and operational simplicity. Great for 10GB environments with existing FC storage. CONS: Cost of new Networking infrastructure. iSCSI – PROS: Great for first shared array, cost and simplicity dominate. Entry-level VMware ESX implementations. Requires less hardware, it uses lower-cost hardware, and more IT staff members are familiar with the technology. CONS: When an iSCSI path is overloaded, the TCP/IP protocol drops packets and requires them to be resent. When a network path carrying iSCSI storage traffic is oversubscribed, a bad situation quickly grows worse and performance further degrades as dropped packets must be resent. NAS (NFS) – PROS: Relies on inexpensive TCP/IP and Ethernet cabling. CONS: Not good for applications over 100MBs 1) Does your application require 100 MBs or less? If so, then iSCSI or NFS over 1 GbE will work well. 2) If your application is more demanding then you will need more bandwidth which means you must deploy of FC.
So how much difference does it make in a real example. Let’s compare an EMC CX4-120 to a SATABeast. Over the course of three years the CX4 will consume 48,467 kWs of energy as compared to 28,338 kWs for SATABeast. If you look at the difference between EMC’s number and ours and then add the cascade effect, there is an additional benefit of 30,088 kWs watts saved. Adding both the CAPEX and OPEX numbers together, that puts EMC’s cost at $200,510 versus $76,635 for Nexsan. Nexsan is 62% less expensive. By the way, this is just one 4U in a rack, and it still save the equivalent of the amount of energy that would be used by 2.51 single family homes. Imagine what it looks like when you compare configurations that are larger.
DCiE = 47% PUE = 2.13 This was run in Rev 2 of Efficiency TradeOff Tool (not yet released as of April 13, 2009) Assumptions: 1MW data center capacity 50% loaded Traditional UPS Single path power Chilled water Cooling tower Perimeter cooling Non-redundant cooling system No economizer Standby generator
Before Here you have a “normal” legacy type data center. The UPS is about 2/3 loaded and the cooling is about 50% loaded. This data center has a fairly low DCiE of about 29%. DCiE (Data center infrastructure efficiency) expresses electrical efficiency of a data center as the fraction of the total electrical power supplied to the data center that is ultimately delivered to the IT load. Expressed this way, efficiency falls between zero and one, and is commonly expressed as percent (100% being perfect efficiency, meaning all power into the data center is delivered to the IT loads). Power to IT/Power In After an IT virtualization project, the scaled down quantity of servers are spread out across the IT racks. The servers can not all be put into a single rack because the room cooling is too far away from the centralized high density. You can see now that the cooling is now running at about ¼ of its capacity while the UPS is running at about one third. These low level puts the power and cooing into very inefficent states of operation as the efficiency lowers as the load lowers generally. The resulting DCiE is now at 16%. PLUS right-sized power and cooling If the project included APC InfraStruXure purchase at the same time as the IT virtualization project they could have right-sized the power and cooling resulting in a much higher 63% DCiE. Another benefit being a high density deployment that take advantage of “close coupled” high efficiency cooling and the ability eliminate 3 IT racks - real estate savings
Virtualization: Doing it right the first time to avoid costly repeat attempts. Software Licensing, Storage Options, Power and Cooling and Management
vSphere 4 Product Licensing Essentials includes support and Essentials Plus requires support.
vSphere 4 Product Licensing Support is required and sold separately. vSphere 4 Acceleration Kits/Promotions
Common Mistake Failure to adjust your power and cooling for your new infrastructure may result in decreased efficiency
Defining Data Center Infrastructure Efficiency The percent of your input power that gets to the IT loads The rest goes to power, cooling, and lighting equipment DCiE Data center infrastructure efficiency IT load power Total data center input power =
POWER system COOLING system The cooling system uses the most energy in the data center Data Center Physical Infrastructure IT
Go Go to latest online version of this tool Click to resume presentation mode Done
Right-sizing improves power use AND efficiency EFFICIENCY POWER USE Always goes down with virtualization Always goes down, UNLESS power/cooling is downsized to match load AFTER virtualization ROOM cooling Non-scalable UPS Unused rack space Servers Unused POWER capacity Unused COOLING capacity ROOM cooling Non-scalable UPS BEFORE virtualization Power use DOWN Due to consolidated servers 29% Due to losses from excess capacity DCiE LOW 16% Due to losses from GREATER excess capacity DCiE LOWER PLUS right-sized power and cooling Power use down MORE Due to RIGHT-SIZED power/cooling Scalable ROW cooling 63% Due to RIGHT-SIZED power/cooling DCiE HIGHER Scalable UPS