Gigabit Ethernet Bit Error Rate
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Channel VMware Virtualization Load Balancing Storage FCoE Certifications ← Initial Thoughts on Apple's NewInitiative Rethinking RAID Cards on Isolated ESXiHosts → A High Fibre Diet: Twisted Pair ethernet bit error rate standard StrikesBack February 10, 2012 12 Comments I saw a tweet recently
Gigabit Ethernet Error Rate
from storage and virtualization expert Stu Miniman regarding Emulex announcing copper 10GBase-T Converged Network Adapters, running 10 Gigabit ethernet error rates Ethernet over copper (specifically Cat 6a cable). I recalled a comment I heard Greg Ferro made on a packet pushers episode (and subsequent blog post) about copper not being 10g ethernet bit error rate reliable enough for storage, with the specific issue being the bit error rate (BER), how how many errors the standard (FC, Ethernet, etc.) will allow over a physical medium. As we've talked about before, networking people tend to be a little more devil-may-care about their bits, where as storage folks get all anal rententive chef about their bits.
1000base-t Ber
For 1 Gigabit Ethernet over copper (802.3ab/1000Base-T), the standard calls for a goal BER of less than 10-10, or one wrong bit in every 10,000,000,000 bits. Which incidentally, is one error every second for a line rate 10 Gigabit Ethernet. For Gigabit, that's on error every 10 seconds, or 6 per minute. Fibre Channel has a BER goal of less than 10-12, or on error in every 1,000,000,000,000 bits. That would be about 2 errors a minute with 10 Gigabit Ethernet. That's also 100 times less error-prone than Ethernet, which if you think about it, is a lot. To give a little scale, that's like comparing Barney Fife from The Andy Griffith show's bad assery to Jason Statham's character in.. well any movie he's ever been in. Holy shit, is he fighting… truancy? Barney Fife, the 10-10 error rate of law enforcement. Wait… Wow, did I really just say that? So given how fastidious about their storage networks storage folks can be, it's understandable that storage administrator wouldn't want their precious SCSI co
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802 Functional Requirements Document
system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the https://datacenteroverlords.com/2012/02/10/a-high-fibre-diet/ top How does BER compare between different 10GbE physical media? up vote 13 down vote favorite 2 I am under the impression that you should use optical for 10GbE networking because of a BER (bit error rate) several orders of magnitude lower than copper. I'm pretty sure I previously found documentation stating so, but for the life of me I just cannot find it. I'd like to see documentation on typical http://serverfault.com/questions/414025/how-does-ber-compare-between-different-10gbe-physical-media BER (in general, if such a thing exists) for: 10GBase-T ports (with Cat6a cabling) 10GBase-CX4 ports 10GBase-T SFP+ modules (Cat6a cabling) Fiber SFP+ SR modules DAC SFP+ modules networking ethernet 10gbethernet sfp share|improve this question edited Aug 3 '12 at 15:36 asked Aug 3 '12 at 14:47 MikeyB 29.1k565150 5 I think distance and cost requirements may factor into your decision matrix as well. –Mike Pennington Aug 3 '12 at 14:51 BER by itself is a meaningless metric when comparing technologies. It only has meaning when comparing the same product from different vendors. By the way: Copper SFP+ is misleading: These are eiter 10Gbase-T or Twinax (which is the same as DAC). –Tonny Aug 3 '12 at 15:03 Distance and cost requirements will factor into the overall decision, yes, but the purpose behind this question is to gain insight into the BER of various media. –MikeyB Aug 3 '12 at 15:37 BER is absolutely -not- meaningless. There is a two order of magnitude difference between twisted pair and twinax. This is why, for example, FCoE isn't supported on 10GBaseT yet. –rnxrx Aug 3 '12 at 19:36 Great! Can you please provide documentation? –MikeyB Aug 3 '12 at 19:47 | show
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