Agree with all you say. HA system design is what I do for a living. But losing a line or a card isn't what we are worried about. The story was losing a node due to a reboot. Thus that's the level I'm addressing here.
22 seconds is something you'd find on an acid trip. I could build you a system that has all the redunancy in the world - My last job had to be redundant over cities in case an earthquake took out the infrastructure of one of them (I'm in Chile) - but you will not get a failover in 22 seconds.
Think about it. Something goes down and you lose a cluster node. Something somewhere needs to relize that there is a change in the system.
Assume we are sending keepalives every second. You need to miss 4 keep alives to be assured of a failure. That's 4 seconds.
Given that most contracts specify the penalty clauses on uptime to be calculated on a monthly or three monthly basis, that's your 0.9999999 blown already.
You want shorter keepalives? What 0.1 sec? When you have 40km between sites, that's not going to happen.
No. IMHO 7 nines is impossible for any "real world" service.
The system offers unprecedented voice quality, touch-screen technology, dynamic reconfiguration capabilities to meet changing needs, and an operational availability of 0.9999999.
Whoah! 7 nines uptime!
22 seconds of downtime per year.
Somebody is on drugs if they sold that. Somebody is on even stronger drugs if they bought that story.
"5 nines", for all intents and purposes, is as good as it gets, with "6 nines" seen as the holy grail. The top HA system I've ever dealt with (running a Telco's billing operation spanning 4 countries!) quoted a figure of 0.999996. To nobody's suprise, it did not run Windows.
Wonder how much their failure clause is going to set them back?
In the end, it doesn't matter. You can't roll out a system as critical as air traffic control that is not tolerant to one tech not following his job description. The worst case scenario, his death, could lead to the deaths of hundreds of other people.
If they found a bug that means monthly reboots, for a mission critical system that stops planes banging into each other (something very likely to cause loss of human life), Why the fuck did they roll it out?
You don't implement this sort of system without months and months of testing with real data in real time.
Somebody cut costs here, and it obviously wasn't the tech.
You design this sort of system _expecting_ that a reboot or two will be missed. Okay.. blame the tech if he didn't follow procedure.. but what if the reboot didn't happen because the tech's wife was in labor or if his kid got hit by a truck? You design systems thinking of the _worst_ case scenario.
You don't run a fucking air traffic control system with a "one truck" vulnerability.
I'm still uncomfortable about using the program for higher stakes games.
Rightly so. Chances are that higher stakes games attract players of a higher calibre who can't be milked quite as easily as those you find on the 50c tables.
Multi Billion dollar industry upset that somebody is taking their profit away.
Drink my tears with a spoon.
Alternate response: DUH.
If you can play the stock market with bots, its gonna be possible to play poker with bots. They're both about moving money from one person's pocket to another.
If your site/application/etc is so poorly designed that anything but a human player can compete, sux to be you.
And yes, I do believe that Moonshine should be legal.
but ever since I saw "Meatballs", "Porkies" and the rest of the teen-camp-skinflick genre played on late night TV during the 80s, DS are two initials that should not be used for any product.
Yes, I know about "DSL" (ADSL, SDSL etc).. which may be one reason I opted for a T1.
Call me immature, but there are links that were forged in my mind.
I feel that a lot of Marketting departments really are blindly applying theories, but not evaluating results or adapting to a changing, more cynical populace.
Yeah.. but my browser of choice at home (Opera) doesn't show the bookmarks in my default browser at work (Mozilla) nor those one whichever dev box I'm working on (Netscape, IE, Mozilla, Opera)
Delocalized Bookmarks would be very handy for me, and once every fridge, PDA, Cel phone, GPS, Gameboy, Calulator etc etc has an integrated Web browser, it will be more important still.
If they do it, and patent it in such a way that Google can't follow, that could very well give them an edge.
I'm a fan of "Complementary Medicine"... at least some.
I believe that some "natural extracts" used by the native peoples of central and south America have effects just as legitimate as those produced and bottled by the drug companies (and, given their current interest, it seems that the drug companies do as well).
My fiancee practises yoga, and her health has noticably improved. By noticably I mean her cranky week once-a-month is now down to about 2 days. Thanks be to Yoga.
We have something like 15 varieties of herbal teas in the house, I have the odd manipulative massage to realign my "Qui", and would try acupucture if I wasn't such a wuss...
But homeopathy is bollocks. Bullshit. Charlatan rantings. There is nothing nothing nothing to it. Man.. you are drinking water for Christssake. There is no memory effect.
My brother was in hospital having Chemo after losing a testicle to cancer. Some of his hippy friends told him to walk out of the treatment and use homeopathic "medicines". Like the sensible bloke that he is, he told them to bugger off.
I can't lay me hand on the reference, but recently I came across some "team communication facilitations expert" who went about redefining "dialogue" as (paraphrased) "different from conversation in that dialogue activity includes all team members in the dicussion".
No, wombat. Dialogue. Dia. Two. As in diametric, diagonal, diarrhea.
If you want a word to describe an all-inclusive discourse, this aint it. Go back to wanking 101.
If you don't understand basic word construction, I'm not going to trust your take in expanding that to whole sentences, let alone interraction.
The first photo is a house boat in Amsterdam where I spent 3 nights with 4 friends and a serious amount of...um... alcohol back in May 2000. Its comes complete with TV and Stereo... and just to show the we are antisocial Australians we played Cold Chisel at full pelt everytime a tour boat went past and peer in our windows... which was about 18 hours a day.
Thanks to the blogger for the trip down memory lane!
ooh.. we are cynical.
Most IT chiefs I know are clamoring for more people, but can't get the funds. Getting rid of the bullshit tasks clears people up for important work.
I can't think of a single person I know who would regard wasting 4 hours a day cleaning up spyware as reasonable use of their skills. And if that's the extent of your skills, why the fuck are you in IT?
Slashdot Mirror
"Date" is an Australian term for "anus".
.. um... common way of expressing disfaction with a company is to fax them a photocopy of it.
One
Usually after drinking beer.
Agree with all you say. HA system design is what I do for a living. But losing a line or a card isn't what we are worried about. The story was losing a node due to a reboot. Thus that's the level I'm addressing here.
22 seconds is something you'd find on an acid trip. I could build you a system that has all the redunancy in the world - My last job had to be redundant over cities in case an earthquake took out the infrastructure of one of them (I'm in Chile) - but you will not get a failover in 22 seconds.
Think about it. Something goes down and you lose a cluster node. Something somewhere needs to relize that there is a change in the system.
Assume we are sending keepalives every second. You need to miss 4 keep alives to be assured of a failure. That's 4 seconds.
Given that most contracts specify the penalty clauses on uptime to be calculated on a monthly or three monthly basis, that's your 0.9999999 blown already.
You want shorter keepalives? What 0.1 sec? When you have 40km between sites, that's not going to happen.
No. IMHO 7 nines is impossible for any "real world" service.
Its Texas, man. All texas judges are spawn campers.
Whoah! 7 nines uptime!
22 seconds of downtime per year.
Somebody is on drugs if they sold that. Somebody is on even stronger drugs if they bought that story.
"5 nines", for all intents and purposes, is as good as it gets, with "6 nines" seen as the holy grail. The top HA system I've ever dealt with (running a Telco's billing operation spanning 4 countries!) quoted a figure of 0.999996. To nobody's suprise, it did not run Windows.
Wonder how much their failure clause is going to set them back?
In the end, it doesn't matter. You can't roll out a system as critical as air traffic control that is not tolerant to one tech not following his job description. The worst case scenario, his death, could lead to the deaths of hundreds of other people.
If they found a bug that means monthly reboots, for a mission critical system that stops planes banging into each other (something very likely to cause loss of human life), Why the fuck did they roll it out?
You don't implement this sort of system without months and months of testing with real data in real time.
Somebody cut costs here, and it obviously wasn't the tech.
You design this sort of system _expecting_ that a reboot or two will be missed. Okay.. blame the tech if he didn't follow procedure.. but what if the reboot didn't happen because the tech's wife was in labor or if his kid got hit by a truck? You design systems thinking of the _worst_ case scenario.
You don't run a fucking air traffic control system with a "one truck" vulnerability.
Try preparing the coffee with some sort of liquid. I recommend water.
You don't get the instant caffiene high like you do with chewing the beans*, but it does go down easier**
*Yes, I do this. Chocolate coated coffee beans rock
**Unless its Starbucks, which needs shot of snotberry flavoring to make it tolerable.
Never having played online poker, what's to stop 3 friends joining the same game then working together to milk the others at the table?
Rightly so. Chances are that higher stakes games attract players of a higher calibre who can't be milked quite as easily as those you find on the 50c tables.
Multi Billion dollar industry upset that somebody is taking their profit away.
Drink my tears with a spoon.
Alternate response: DUH.
If you can play the stock market with bots, its gonna be possible to play poker with bots. They're both about moving money from one person's pocket to another.
If your site/application/etc is so poorly designed that anything but a human player can compete, sux to be you.
And yes, I do believe that Moonshine should be legal.
This may be off topic..
but ever since I saw "Meatballs", "Porkies" and the rest of the teen-camp-skinflick genre played on late night TV during the 80s, DS are two initials that should not be used for any product.
Yes, I know about "DSL" (ADSL, SDSL etc).. which may be one reason I opted for a T1.
Call me immature, but there are links that were forged in my mind.
You didn't read this article.
I feel that a lot of Marketting departments really are blindly applying theories, but not evaluating results or adapting to a changing, more cynical populace.
Yeah.. but my browser of choice at home (Opera) doesn't show the bookmarks in my default browser at work (Mozilla) nor those one whichever dev box I'm working on (Netscape, IE, Mozilla, Opera)
Delocalized Bookmarks would be very handy for me, and once every fridge, PDA, Cel phone, GPS, Gameboy, Calulator etc etc has an integrated Web browser, it will be more important still.
If they do it, and patent it in such a way that Google can't follow, that could very well give them an edge.
All set. Lets go!
*as this is an Australian story, this is the Australian definition of "date".
Obligatory potato link.
Fuck off, virgin :P
Mod Parent Up.
I'm a fan of "Complementary Medicine"... at least some.
I believe that some "natural extracts" used by the native peoples of central and south America have effects just as legitimate as those produced and bottled by the drug companies (and, given their current interest, it seems that the drug companies do as well).
My fiancee practises yoga, and her health has noticably improved. By noticably I mean her cranky week once-a-month is now down to about 2 days. Thanks be to Yoga.
We have something like 15 varieties of herbal teas in the house, I have the odd manipulative massage to realign my "Qui", and would try acupucture if I wasn't such a wuss...
But homeopathy is bollocks. Bullshit. Charlatan rantings. There is nothing nothing nothing to it. Man.. you are drinking water for Christssake. There is no memory effect.
My brother was in hospital having Chemo after losing a testicle to cancer. Some of his hippy friends told him to walk out of the treatment and use homeopathic "medicines". Like the sensible bloke that he is, he told them to bugger off.
Maybe homeopathy is just an example of Darwinism.
If the DOJ couldn't do it, what makes you think we could?
There is more to marriage than sex. In fact, once you are married, there is a lot less sex.
No its not. The marijuana field is the one full of happy workers.
And Catholics still ask their priests for marital advise. How more fucked up can you get?
No, wombat. Dialogue. Dia. Two. As in diametric, diagonal, diarrhea.
If you want a word to describe an all-inclusive discourse, this aint it. Go back to wanking 101.
If you don't understand basic word construction, I'm not going to trust your take in expanding that to whole sentences, let alone interraction.
Woah!
The first photo is a house boat in Amsterdam where I spent 3 nights with 4 friends and a serious amount of...um... alcohol back in May 2000. Its comes complete with TV and Stereo... and just to show the we are antisocial Australians we played Cold Chisel at full pelt everytime a tour boat went past and peer in our windows... which was about 18 hours a day.
Thanks to the blogger for the trip down memory lane!
ooh .. we are cynical.
Most IT chiefs I know are clamoring for more people, but can't get the funds. Getting rid of the bullshit tasks clears people up for important work.
I can't think of a single person I know who would regard wasting 4 hours a day cleaning up spyware as reasonable use of their skills. And if that's the extent of your skills, why the fuck are you in IT?
There's a preview of how Badnarik is going to smack you down, though I'm sure he'll do it more eloquently than I.
as in...
GRADUATED TAXES ARE NOT FAIR NOR EQUITABLE, BITCH.