Thread started: Jul 31 2008, 5:38 PM EDT
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One of the most important steps in planning for an iSCSI SAN is properly determining the size of the SAN solution required then sizing the network infrastructure appropriately to allow for current AND future growth. I am currently working a whitepaper that will be released soon that looks at Layer 2 switches such as the PowerConnect 54xx Series and helps in determining if a layer 2 network solution (and the PC54xx in particular) can handle a SAN of the size you are looking at.
How many ports does it take to actually implement an EqualLogic SAN?
Working with the Dell EqualLogic engineering team in Nashua and with the PowerConnect team here in Round Rock, I came up with a quick formula to determine the number of ports you need:
(([#Arrays]x 6) + ([# hosts]x 2) + ([#Active PSArray Ports] x 2))
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For the details you will have to wait for the full paper, but thought you might find this of use.
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RE: Layer 2 Networks and EqualLogic SANs
By: wwolfram,
Thursday, 3:06 PM EDT
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3750 does seem like a great choice as well." The original formula that Tony posted is based on 2 switches... thus the division by 2. The idea behind the ([#Active PSArray Ports] x 2)) part of the equation is to avoid bottlenecks in the network... That is why we implement equal interswitch links to # of active EQL ports.... The Cisco 3750's are stackable... have high speed interconnect between eachother that make it a very nice solution for EQL switching (we avoid ISL's that take up ports).... the number of ports used if 3750's are implemented is simply: (([#Arrays]x 6) + ([# hosts]x 2) .
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