Line Interactive - Can correct line over/under voltage to a point (APC Smartups)
Online - Full AC -> DC -> AC conversion. (APC Symetra, Liebert, anything that doesn't suck)
Basically outside of home use you want an online type UPS.
There are other systems like motor/generator flywheel types, but they need a very fast backup generator to sustain anything more than 30 seconds of outage. But they're great for smoothing out some types of line issues.
Yea, I was shocked at how much energy the family in this article uses. My GF and I average ~370kWh/month, 4,440kWh/year. We live in Mountain View, which is the next small city over from Sunnyvale. The family in this article is using 17,400kWh/year. If he expects a 20% drop in usage when the family becomes 2 people, that's still THREE TIMES what we use. I also have a home server and network.
Buried away is this quote: "Brushless or Induction? Back in the 1990s all of the electric vehicles except one were powered by DC brushless drives. Today, all the hybrids are powered by DC brushless drives, with no exceptions. The only notable uses of induction drives have been the General Motors EV-1; the AC Propulsion vehicles, including the tzero; and the Tesla Roadster."
Yes, DKIM is a much better solution than SPF. I've been slowly adding keys to domains that I host on my mail server. None of them will stop spammers, but one of these days I can hope to eliminate some of the backscatter spam I get.
# turn sending of screen messages to hardstatus off hardstatus on # Set the hardstatus prop on gui terms to set the titlebar/icon title termcapinfo xterm*|rxvt*|kterm*|Eterm* hs:ts=\E]0;:fs=\007:ds=\E]0;\007 # use this for the hard status string hardstatus alwayslastline #hardstatus string "%h%? users: %u%?" hardstatus string "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %H %{..Y} %m/%d %C%a "
Yes, the also lost the MHz war with WinCE. WinCE was such a hog for CPU and memory that all of the devices needed atleast 4x the CPU speed and RAM just to make something similar in function. People on slashdot whined and complained how the Palm had only a 25MHz dragonball when you could get a "much faster" 100+MHz Compaq or something. Too bad for Palm because the WinCE device would last for about a day on L-Ion rechargeable, and the Palm would be fine for a week or two on a couple of AAA batteries.
PalmOS was brilliantly efficient as a PDA OS. But then the world changed and people want to play MP3s and now watch YouTube on their PDA.
Yup, and "easy to use" is more about familiarity than it is intuitive. I find Windows to be less and less easy to use these days simply because I am far more familiar with Linux. People will ask me things like "I need to fix all the spelling of all the artist tags on this directory full of mp3 files"
I think.. Easy, just id3v2 with foo options, and maybe find|xargs if I'm feeling fancy. Or if it's "I have a bunch of filenames with this format, but there are no tags".. easy just a little for loop with some sed or something and id3v2 and poof, done in seconds.
On windows.. crap, you gotta go find some tag editing GUI thing that does the exact operation you want.. I give up after a few min and say "Sorry, I don't know how to use Windows."
I don't understand why people use such over-rated PSUs. I guess it is just a dick-sizing thing.
My server/workstation at home consumes ~120W at idle, and 200W under full load. I bought a "small" 380W PSU a few years ago when the same machine was drawing ~250-300W under full load. After dumping the dual socket Athlon and switching to a single socket dual core, and turning on cpu frequency scaling my power bill droped $10/month.
I did the math a while back based on my CA $0.12/kwh. Every watt I use, translates into about $1/year.
I can only assume that they got that storage number wrong. We had more than 8T of storage for a couple of our small (a few hundred cores) IBM power4 cluster in 2005. Normal compute clusters have 1-2G of ram per core, which means they should have atleast 9T of RAM in this cluster of 9k cores.
Hell, at my work installations are self-service over PXE boot. When ever I have changed hardware with our support people I wipe and clean install the machine myself anyway just to be sure I have a clean linux image.
Yea, I left that company many years ago. At the time they were hurting because of mexican competition. I think they went out of business in 2006.
I did my duty when i left saying "you NEED to change these backup tapes so amanda can work". Of course they didn't listen, and I heard through the rumor mill that a year or two after I left the A/C in the server room died and the main server's disks all melted and they lost a huge ammount of database data and code that should have been on the tapes.:-)
Yea, I love driving too. Every once in a while I think about selling my VW Jetta and getting a small 2 seater for nothing but driving. I like to go snowboarding and the VW is very well suited for carrying 4 people and boards up to lake tahoe so I can't justify getting rid of it. A second car would be silly.
What I hate is commuting. I do everything in my power to avoid driving to every day to work. These days I cycle to work 7 miles round trip. It's great, I almost wish I could bike just a bit more, maybe 10-15 miles round trip. When the weather is unpleasant, I take the bus. I drive to work maybe 5 days out of the year. My car (My SO and I only have the one) sits in the driveway most days.
The US moves (by weight): Truck: 60% Train: 10% Boat: 8% Pipeline: 18% Mixed-mode: 1% Other 2%
The interesting thing is the ton-miles table where Trains are much closer to Trucks.
I used to work at a mid-sized auto parts company. We had a fleet of about 20 trucks that would move things from Minnesota to about half of the country, mostly on the east side. I always thought it was fairly in-efficient that we had trucks that would go all the way to Texas instead of driving it into Minneapolis (55 miles), then shipping it via train to Dallas where a local truck would take it to a warehouse for store distribution.
Yup, and all that stuff is basically worthless because you can spawn tasks on a cluster in seconds without any need for the wasteful overhead of VMs. All you need is a good task scheduler.
Even at the scale of a couple of racks (an average 12x12 colo cage at savvis or some place) you get many times the compute/storage capacity of a z10.
It's interesting technology, but completely wasteful when it comes to $/work
That depends on a lot of factors. Moving heat efficiently depends on differences and densities.
Good cooling designs also use evaporation to do a bulk of the work. On a large 20 story building at the University they had 4 cooling towers that mostly just pushed air through waterfalls that went over the heat exchanger coils.
So how much does that z10 cost? What's the physical footprint? 1.5T of RAM is a good target for comparison.
HP DL160 G5: $6672 USD Low power dual quad-core, 4x 500GB disk, 32GB ram.
Say Google gets a good discount for quantity, maybe 25%.. $5000 each.
That seems like a simple enough commodity server these days.. A rack of 40 machines would come out to $200,000 USD, add another $50k for misc stuff and switching gear (rack and core)
Each rack now has 1.25TB of RAM, 320 cores, 80TB of disk (who needs FC or iSCSI when you have your own distributed FS and DB). The rack also has a power footprint of about 20KW under full load.
I also don't see why thousands of VMs is a good thing. If each VM runs a linux kernel and basic daemons, you'll need about 100MB of ram each. There's 5-10% of your RAM gone for doing real work.
If a z10 with 1.5TB of RAM and 80T of disk fits in a single 19" rack, there's a small density win, but I doubt you can get a z10 with those specs for $250k USD.
The problem comes from requirements changing. "Sorry, we designed this building for X load, now you're using X+10% load so we have to add additional cooling units to keep up"
I had this problem at the University where I worked a while ago. We rolled in a nice new SGI Altix machine. We had enough power, but the cooling system couldn't move enough cubic feet of air into the one part of the room where the box was. As soon as you reach capacity, temps skyrocket.
Both Bussard and Lerner have ideas for H+B11 fusion. They sound a bit like crack-pots conspiracy theorists, but it would be interesting if it were viable.
Here's a couple videos of talks they gave on the subject.
This reminds me of the old Mac Control security application. It used an extension to lock out access to applications, except for a password entry dialog application. The dialog application had a special creator attribute. I simply set the creator attribute for a copy of norton disk editor which was great for fixing just about anything I wanted.
Slashdot Mirror
Yup the 3 major types of battery UPSs I know of:
Offline - Relay or simple failover. (APC Backups)
Line Interactive - Can correct line over/under voltage to a point (APC Smartups)
Online - Full AC -> DC -> AC conversion. (APC Symetra, Liebert, anything that doesn't suck)
Basically outside of home use you want an online type UPS.
There are other systems like motor/generator flywheel types, but they need a very fast backup generator to sustain anything more than 30 seconds of outage. But they're great for smoothing out some types of line issues.
Yea, I was shocked at how much energy the family in this article uses. My GF and I average ~370kWh/month, 4,440kWh/year. We live in Mountain View, which is the next small city over from Sunnyvale. The family in this article is using 17,400kWh/year. If he expects a 20% drop in usage when the family becomes 2 people, that's still THREE TIMES what we use. I also have a home server and network.
Sorry, I meant to say induction.
See this great blog post: http://www.teslamotors.com/blog4/?p=45
Buried away is this quote: "Brushless or Induction?
Back in the 1990s all of the electric vehicles except one were powered by DC brushless drives. Today, all the hybrids are powered by DC brushless drives, with no exceptions. The only notable uses of induction drives have been the General Motors EV-1; the AC Propulsion vehicles, including the tzero; and the Tesla Roadster."
The Tesla uses is a brushless AC motor. The licensed the design from AC Propulsion who sell Scion xA/xB electric conversion services.
Yes, DKIM is a much better solution than SPF. I've been slowly adding keys to domains that I host on my mail server. None of them will stop spammers, but one of these days I can hope to eliminate some of the backscatter spam I get.
Then why would they have an entire site dedicated to it?
https://shipit.ubuntu.com/
Or you could save $2/domain/year and go with omnis.com. If you have 200+ domains, they drop the price to $6.95 for .com.
And of course my favorite thing in my .screenrc:
# turn sending of screen messages to hardstatus off
hardstatus on
# Set the hardstatus prop on gui terms to set the titlebar/icon title
termcapinfo xterm*|rxvt*|kterm*|Eterm* hs:ts=\E]0;:fs=\007:ds=\E]0;\007
# use this for the hard status string
hardstatus alwayslastline
#hardstatus string "%h%? users: %u%?"
hardstatus string "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %H %{..Y} %m/%d %C%a "
Yes, the also lost the MHz war with WinCE. WinCE was such a hog for CPU and memory that all of the devices needed atleast 4x the CPU speed and RAM just to make something similar in function. People on slashdot whined and complained how the Palm had only a 25MHz dragonball when you could get a "much faster" 100+MHz Compaq or something. Too bad for Palm because the WinCE device would last for about a day on L-Ion rechargeable, and the Palm would be fine for a week or two on a couple of AAA batteries.
PalmOS was brilliantly efficient as a PDA OS. But then the world changed and people want to play MP3s and now watch YouTube on their PDA.
Yup, and "easy to use" is more about familiarity than it is intuitive. I find Windows to be less and less easy to use these days simply because I am far more familiar with Linux. People will ask me things like "I need to fix all the spelling of all the artist tags on this directory full of mp3 files"
I think.. Easy, just id3v2 with foo options, and maybe find|xargs if I'm feeling fancy. Or if it's "I have a bunch of filenames with this format, but there are no tags".. easy just a little for loop with some sed or something and id3v2 and poof, done in seconds.
On windows.. crap, you gotta go find some tag editing GUI thing that does the exact operation you want.. I give up after a few min and say "Sorry, I don't know how to use Windows."
I don't understand why people use such over-rated PSUs. I guess it is just a dick-sizing thing.
My server/workstation at home consumes ~120W at idle, and 200W under full load. I bought a "small" 380W PSU a few years ago when the same machine was drawing ~250-300W under full load. After dumping the dual socket Athlon and switching to a single socket dual core, and turning on cpu frequency scaling my power bill droped $10/month.
I did the math a while back based on my CA $0.12/kwh. Every watt I use, translates into about $1/year.
I can only assume that they got that storage number wrong. We had more than 8T of storage for a couple of our small (a few hundred cores) IBM power4 cluster in 2005. Normal compute clusters have 1-2G of ram per core, which means they should have atleast 9T of RAM in this cluster of 9k cores.
Worse yet, some models may have a random selection of which type of panel you will get.
Thankfully a bit of research will let you know what type of panel is used for a screen you may want.
Hell, at my work installations are self-service over PXE boot. When ever I have changed hardware with our support people I wipe and clean install the machine myself anyway just to be sure I have a clean linux image.
Yea, I left that company many years ago. At the time they were hurting because of mexican competition. I think they went out of business in 2006.
:-)
I did my duty when i left saying "you NEED to change these backup tapes so amanda can work". Of course they didn't listen, and I heard through the rumor mill that a year or two after I left the A/C in the server room died and the main server's disks all melted and they lost a huge ammount of database data and code that should have been on the tapes.
Yea, I love driving too. Every once in a while I think about selling my VW Jetta and getting a small 2 seater for nothing but driving. I like to go snowboarding and the VW is very well suited for carrying 4 people and boards up to lake tahoe so I can't justify getting rid of it. A second car would be silly.
What I hate is commuting. I do everything in my power to avoid driving to every day to work. These days I cycle to work 7 miles round trip. It's great, I almost wish I could bike just a bit more, maybe 10-15 miles round trip. When the weather is unpleasant, I take the bus. I drive to work maybe 5 days out of the year. My car (My SO and I only have the one) sits in the driveway most days.
How about this:
http://www.bts.gov/publications/freight_in_america/html/table_01.html
The US moves (by weight):
Truck: 60%
Train: 10%
Boat: 8%
Pipeline: 18%
Mixed-mode: 1%
Other 2%
The interesting thing is the ton-miles table where Trains are much closer to Trucks.
I used to work at a mid-sized auto parts company. We had a fleet of about 20 trucks that would move things from Minnesota to about half of the country, mostly on the east side. I always thought it was fairly in-efficient that we had trucks that would go all the way to Texas instead of driving it into Minneapolis (55 miles), then shipping it via train to Dallas where a local truck would take it to a warehouse for store distribution.
That's what the "Objectives" and "Recreation" seconds of the CV are for.
:-)
I would be perfectly happy to see "OMG get me out of this Microsoft hell hole" as the first line of the CV.
Yup, and all that stuff is basically worthless because you can spawn tasks on a cluster in seconds without any need for the wasteful overhead of VMs. All you need is a good task scheduler.
Even at the scale of a couple of racks (an average 12x12 colo cage at savvis or some place) you get many times the compute/storage capacity of a z10.
It's interesting technology, but completely wasteful when it comes to $/work
That depends on a lot of factors. Moving heat efficiently depends on differences and densities.
Good cooling designs also use evaporation to do a bulk of the work. On a large 20 story building at the University they had 4 cooling towers that mostly just pushed air through waterfalls that went over the heat exchanger coils.
So how much does that z10 cost? What's the physical footprint? 1.5T of RAM is a good target for comparison.
HP DL160 G5: $6672 USD
Low power dual quad-core, 4x 500GB disk, 32GB ram.
Say Google gets a good discount for quantity, maybe 25%.. $5000 each.
That seems like a simple enough commodity server these days.. A rack of 40 machines would come out to $200,000 USD, add another $50k for misc stuff and switching gear (rack and core)
Each rack now has 1.25TB of RAM, 320 cores, 80TB of disk (who needs FC or iSCSI when you have your own distributed FS and DB). The rack also has a power footprint of about 20KW under full load.
I also don't see why thousands of VMs is a good thing. If each VM runs a linux kernel and basic daemons, you'll need about 100MB of ram each. There's 5-10% of your RAM gone for doing real work.
If a z10 with 1.5TB of RAM and 80T of disk fits in a single 19" rack, there's a small density win, but I doubt you can get a z10 with those specs for $250k USD.
The problem comes from requirements changing. "Sorry, we designed this building for X load, now you're using X+10% load so we have to add additional cooling units to keep up"
I had this problem at the University where I worked a while ago. We rolled in a nice new SGI Altix machine. We had enough power, but the cooling system couldn't move enough cubic feet of air into the one part of the room where the box was. As soon as you reach capacity, temps skyrocket.
Both Bussard and Lerner have ideas for H+B11 fusion. They sound a bit like crack-pots conspiracy theorists, but it would be interesting if it were viable.
Here's a couple videos of talks they gave on the subject.
http://video.google.com/videoplay?docid=1996321846673788606
http://video.google.com/videoplay?docid=-1518007279479871760
This reminds me of the old Mac Control security application. It used an extension to lock out access to applications, except for a password entry dialog application. The dialog application had a special creator attribute. I simply set the creator attribute for a copy of norton disk editor which was great for fixing just about anything I wanted.
There's also an odd supply of cheap savvis space these days ;-)
Glad to see all the work on the new colo space end in a smooth transition.