10Gbase-T doesn't make much sense for a new virtual environment. Once you factor in the cost of the cabling and power, you probably would have been better off with DAC or FET interconnects. Also 10Gbase-T does not necessarily work with Legacy wiring, depending upon how it was run. Large bundles of wire cause crosstalk issues on legacy cabling, this is the reason for large jackets on 6A. http://www.siemon.com/us/learning/alien-crosstalk-guide.asp
I'm not saying it won't work for your scenario as I am not familiar with your environment, just keep it in mind that with most environments, DAC is a cheaper and provides better latency for your storage traffic. -----Original Message----- From: Jima [mailto:[email protected]] Sent: Monday, October 01, 2012 3:33 PM To: [email protected] Subject: Re: So what's the deal with 10Gbase-T Gotcha. With SFP+ I think the only nod to backward compatibility would be 1gbit RJ-45 SFPs, which can get a little spendy in large numbers (although so can DACs). As for distance, I admit I haven't encountered any DACs longer than 15 meters (~49 feet) -- not that I'm positive they don't exist. Jima On Mon, Oct 1, 2012 at 2:10pm, Andreas Echavez wrote: > Mostly backwards compatibility; simplicity. We're planning for some > super-high-density virtualization/storage projects mixed in with lower > bandwidth gear, and sticking to one type of cable for everything would > be convenient. I thought DAC had some distance limitations as well. > > This is all speculation though, I don't have any personal experience > with the 10Gbase-T stuff either. I have no idea what to expect > performance-wise. > > -A > > On Mon, Oct 1, 2012 at 12:58 PM, Jima <[email protected]> wrote: > >> > Does anyone here have experience running copper 10Gbase-T networks? >> > It seems like the standard just died out. For us it would make a >> > lot of >> sense >> > for our applications -- even if throughput and latency aren't as >> great. >> If >> > anyone out there knows of any *copper* 10 gig-t switches (48 >> > port?), >> I'd >> > be >> > interested to hear your experiences. I can't seem to find any >> high-density >> > ones from major vendors. >> >> Is there something unique about your environment that wouldn't allow >> you to use 10gbit SFP+-based switches with DAC (Direct Attach Copper) >> cables? >> Those seem fairly well supported. >> >> Jima >> >> >> > ************************************************************************************************** Sterne Agee Group, Inc. and its subsidiaries request that you do not transmit orders and instructions regarding your Sterne Agee account by e-mail. Transactional details do not supersede normal trade confirmations or statements. The information contained in this transmission is privileged and confidential. It is intended for the use of the individual or entity named above. The information contained herein is based on sources we believe reliable but is not considered all-inclusive. Opinions are our current opinions only and are subject to change without notice. Offerings are subject to prior sale and/or change in price. Prices, quotes, rates and yields are subject to change without notice. Sterne Agee & Leach, Inc. member FINRA and SIPC, is a registered broker-dealer subsidiary of Sterne Agee Group, Inc. Generally, investments are NOT FDIC INSURED, NOT BANK GUARANTEED, and MAY LOSE VALUE. Please contact your Financial Advisor with information regarding specific investments. Sterne Agee reserves the right to monitor all electronic correspondence. **************************************************************************************************
