Re: Validation of FCS
On 24/12/2012 00:39, joel jaeggli wrote: I have cut-through switches (arista) that log these as TX errors, they have already left the barn at that point. it's a real pain when this happens because you have no idea of the ingress port and consequently the source of the data corruption source. The same happens for regular packet drops on some cut-thru switches (e.g. brocade ti-24x). Annoying. Nick
Re: why haven't ethernet connectors changed?
On Sat, 22 Dec 2012 18:07:16 -0700, Wayne E Bouchard said: They serve quite well until I get to a switch that some douchebag mounted rear facing on the front posts of the rack with servers above and below and I just stand there cursing for a while as I scratch my head trying to figure out how the hell to even get to the tab in the first place... Has anybody ever seen this with a switch that's 2U or thicker? I've only seen it perpetrated with 1U switches, a situation that usually results in my lapsing into Russian (For the record, my knowledge of Russian is limited to those words that Latvian carpenters reserve for hammers that aim at thumbs. :) pgpuLLPqmT0iI.pgp Description: PGP signature
Fun With Plasma (Re: Fiber only in DataCenters?)
- Original Message - From: George Herbert george.herb...@gmail.com I have also, independently, melted and partly vaporized multiple cubic centimeters of 8 ga wire with a (purely accidental, I assure you) short of 12 volts from a serial stack of D-cell sized NiCd rechargeable batteries. The same works well with an old car 12 V battery and any conductor up to wrenches (not recommended at home...). What's the old saying? Volts hurt, Amps kill? Yep. Back in... this would have had to be 1994 or 5, the St Petersburg Main GTE CO (SPBFLXA89F, I think) was off the air for about 12 hours. Completely off the air. As I understood the story later, some New Guy went into the battery room to do some work, and had not yet gotten the memo about vinyl-dipped tools. He supposedly got a 12 crescent wrench across the main bussbars. Now, to properly appreciate this, you have to know that while the load *at that time* was 30k lines of GTD5 and 2 50k line 5ESS remotes... the building was 7 stories tall... and was originally all crossbar. That battery room was rated, I was told, for about 8000A continuous at -52VDC nominal. The wrench flashed over into plasma on the spot; they never found any of it. Just zits on the bussbars where it hit. The guy was deaf for about a week. I never did hear if he lost his job or not. They probably took the cost of deploying all of St Pete's Police out to strategic street corners to take emergency reports out of his paycheck, though. Cheers, -- jra -- Jay R. Ashworth Baylink j...@baylink.com Designer The Things I Think RFC 2100 Ashworth Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274
Re: Fiber only in DataCenters?
- Original Message - From: Owen DeLong o...@delong.com A 24ga cat-6 wire can take millions of volts as long as you keep the amperage low enough. No it can't; the insulation's only rated for 250V or so. You get much past a kilovolt and it will flash over. Cheers, -- jra -- Jay R. Ashworth Baylink j...@baylink.com Designer The Things I Think RFC 2100 Ashworth Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274
Re: why haven't ethernet connectors changed?
On Mon, Dec 24, 2012 at 07:53:26AM -0500, valdis.kletni...@vt.edu wrote: On Sat, 22 Dec 2012 18:07:16 -0700, Wayne E Bouchard said: They serve quite well until I get to a switch that some douchebag mounted rear facing on the front posts of the rack with servers above and below and I just stand there cursing for a while as I scratch my head trying to figure out how the hell to even get to the tab in the first place... Has anybody ever seen this with a switch that's 2U or thicker? I've only seen it perpetrated with 1U switches, a situation that usually results in my lapsing into Russian 2U seems possible (can't say for certain) but larger, seems like you'd have a fair chance of being able to make something work since you can at least get your hands where they need to be... unless you can't find a ladder. (For the record, my knowledge of Russian is limited to those words that Latvian carpenters reserve for hammers that aim at thumbs. :) An appropriate quote: Profanity is the one language all programmers know. Works well for engineers too. :-) -Wayne --- Wayne Bouchard w...@typo.org Network Dude http://www.typo.org/~web/
Re: IP Address Management IPAM software for small ISP
On Dec 20, 2012, at 9:26 PM, Charles N Wyble wrote: Zenoss works very well Um... you lost me after the first 4 words. Zenoss might work acceptably for very, very small organizations with very small amounts of data. Zenoss is incapable of scaling to even moderate-sized data sets with tens of thousands of data sources, nevermind medium sized data sets with millions of data sources. I work at a very small shop with three total engineers and Zenoss was unable to scale beyond 1/4 of our data sources with dozens of cores and hundreds of gigabytes of RAM on numerous systems. It doesn't actually use any of these, the internal deadlocks in the architecture make it impossible for it to scale. That Zenoss might make a better IP management tool than what it is purported and sold to do... amuses. -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects.
Re: IP Address Management IPAM software for small ISP
Very small shop with millions of data sources? lol? On Mon, Dec 24, 2012 at 10:38 PM, Jo Rhett jrh...@netconsonance.com wrote: On Dec 20, 2012, at 9:26 PM, Charles N Wyble wrote: Zenoss works very well Um... you lost me after the first 4 words. Zenoss might work acceptably for very, very small organizations with very small amounts of data. Zenoss is incapable of scaling to even moderate-sized data sets with tens of thousands of data sources, nevermind medium sized data sets with millions of data sources. I work at a very small shop with three total engineers and Zenoss was unable to scale beyond 1/4 of our data sources with dozens of cores and hundreds of gigabytes of RAM on numerous systems. It doesn't actually use any of these, the internal deadlocks in the architecture make it impossible for it to scale. That Zenoss might make a better IP management tool than what it is purported and sold to do... amuses. -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects. -- 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
Re: IP Address Management IPAM software for small ISP
Small shop people wise with millions of customers and tens of thousands of application and log-derived data sources. We use Zenoss extensively and mostly we keep having to make decisions what data to pull out of it so it can function. I have previously worked at larger enterprises which had millions of data sources, and Zenoss couldn't dream of handling that, no matter how much hardware we threw at it. On Dec 24, 2012, at 10:48 PM, Mike Hale wrote: Very small shop with millions of data sources? lol? On Mon, Dec 24, 2012 at 10:38 PM, Jo Rhett jrh...@netconsonance.com wrote: On Dec 20, 2012, at 9:26 PM, Charles N Wyble wrote: Zenoss works very well Um... you lost me after the first 4 words. Zenoss might work acceptably for very, very small organizations with very small amounts of data. Zenoss is incapable of scaling to even moderate-sized data sets with tens of thousands of data sources, nevermind medium sized data sets with millions of data sources. I work at a very small shop with three total engineers and Zenoss was unable to scale beyond 1/4 of our data sources with dozens of cores and hundreds of gigabytes of RAM on numerous systems. It doesn't actually use any of these, the internal deadlocks in the architecture make it impossible for it to scale. That Zenoss might make a better IP management tool than what it is purported and sold to do... amuses. -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects. -- 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0 -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects.
Re: IP Address Management IPAM software for small ISP
Ahhh. That sucks. I've never put our Zenoss installs through quite that much traffic. That's a shame to hear. On Mon, Dec 24, 2012 at 10:53 PM, Jo Rhett jrh...@netconsonance.com wrote: Small shop people wise with millions of customers and tens of thousands of application and log-derived data sources. We use Zenoss extensively and mostly we keep having to make decisions what data to pull out of it so it can function. I have previously worked at larger enterprises which had millions of data sources, and Zenoss couldn't dream of handling that, no matter how much hardware we threw at it. On Dec 24, 2012, at 10:48 PM, Mike Hale wrote: Very small shop with millions of data sources? lol? On Mon, Dec 24, 2012 at 10:38 PM, Jo Rhett jrh...@netconsonance.comwrote: On Dec 20, 2012, at 9:26 PM, Charles N Wyble wrote: Zenoss works very well Um... you lost me after the first 4 words. Zenoss might work acceptably for very, very small organizations with very small amounts of data. Zenoss is incapable of scaling to even moderate-sized data sets with tens of thousands of data sources, nevermind medium sized data sets with millions of data sources. I work at a very small shop with three total engineers and Zenoss was unable to scale beyond 1/4 of our data sources with dozens of cores and hundreds of gigabytes of RAM on numerous systems. It doesn't actually use any of these, the internal deadlocks in the architecture make it impossible for it to scale. That Zenoss might make a better IP management tool than what it is purported and sold to do... amuses. -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects. -- 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0 -- Jo Rhett Net Consonance : net philanthropy to improve open source and internet projects. -- 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
