Because DHCP doesn't leave any logs. Cute little anonymous coward, you probably even think you can't be traced just cause you posted anonymous from your browser's incognito mode under Linux!
You manage zfs with the "zpool" and "zfs" commads. The filesystem and software raid is one, not md+ext4. If you replace all your drives with larger drives, zfs automagically grows to use all the space. The pool is portable - you can import it to any system without problems.
Anything larger than a few terabyes I call "serious amount". Why? well, think how long it takes to fsck your 250GB drive. Now think how much it will take to fsck 4TB or more - some people can't wait 8 hours for an fsck to finish. ZFS doesn't have fsck - the filesystem is *always* consistent.
The FreeBSD version is a port, ZFS was designed with Solaris in mind. Unices look the same at the command line, but it's the inner workings that make the difference. So I'd rather stick with Solaris, which is what ZFS is developed and tested to work in.
Performance-wise, Solaris wins hands down. In my tests I consistently got 240MB/s reads in Solaris, while Linux was spotted at 160MB/s. No idea why. Curiously enough, power-efficiency-wise Solaris beats Linux too. My UPS reported a 14% idle load with Linux vs 11% with Solaris. Both had power management enabled, but Linux also had tickless and all sorts of funky PM stuff. FreeBSD's power management is next to non-existant.
If you're building a ZFS storage box, I strongly recommend you get an "HP Microserver". $300 gets you a little box with 4 disk trays, 2 extra SATA ports (need hacked BIOS to enable AHCI for them), and an Athlon II Neo processor. The power consumption of the thing is less than 50W, and it's SILENT. Gigabit Ethernet, VGA port, and 6 USB. It comes with a shitty 1GB RAM (but... ECC RAM!), but it has 2 DIMMs. I just added another 4GB ECC (Kingston generic, KVR1333D3E5), but you can discard the 1GB stick. It comes with a tiny 160GB drive - I just recycled for an old desktop. I run 4x1TB WD Green HDDs. By all means, get WD Greens. They're "slow" (not slower than your wifi) but they run cool and don't waste power.
Careful with 4k sector drives (WDxxxEARS), I don't know about FreeBSD/ZFS but Solaris' aligns to 512-bytes and performance sucks. You will need to google on "ashift" to see the workaround. Also, I'd tell you to get 4 disks instead of 3. You can't add more drives to a vdev - that means: a ZFS storage pool consists of multiple vdevs. Your ZFS pool will consist of 1 vdev of 3x2TB drives. If you want to add a 4th drive, your pool will be 3x2TB + 2TB. No redundancy on that one. You can't extend to 4x2TB from 3x2TB. Since most mobos have *at least* 4 drive connectors, use em or lose em.
Ah yes, never make the "OS pool" the data pool. ALWAYS run the OS from a separate drive. If something goes wrong, at least you can mount the data pool in another machine (or a fresh OS install).
I was talking about guys that but full-tower machines to make 4-way RAID 0+1 arrays, with each disk 20cm apart from the other, and a hard drive cooler (with two fans) for each drive. That's overkill. Just a small amount of wind running under the drive is enough to keep it cool. No need to keep it at room temperature. 50C is good enough.
Yes, you need forced air (that is, fans). But a few correctly placed fans for the whole case, are enough.
This is nothing new. You've never been in a datacenter before, kid. You can ask a grownup one day and he can take you there and you will feel the heat. And NOISE. No offense, but I think you're one of those gamer kids who builds rigs for max FPS, with esoteric water cooling and silent fans everywhere.
Yeah, no, you don't need to pamper your hardware that much. Even laptop drives work way hot (60C+) for years with no issue.
Most servers are built that way too. The Sun x4500 is extremely densely packed. And there are hundreds running just fine.
The price also includes custom made cases, fans, the power supplies, and custom-made port multiplier SATA backplanes. The custom parts make it pretty expensive, I guess.
RAID-6, really? After 5+ years working with ZFS, personally, I wouldn't touch md/extX/xfs/btrfs/whatever with a 10 foot pole. Solaris pretty much sucks (OpenSolaris is dead and the open source spinoffs are a joke), but for a storage backend it's years ahead of Linux/BSD.
Sure, you can run ZFS on Linux (I did) and FreeBSD (I do), but for huge amounts of serious data? No thanks.
Very nice but, what's this good for anyway? Nothing. Like every oher "control room big display", this is just there to make it look good in pictures. It doesn't have any real use. I'm not sure if we should blame this on NASA or hollywood. People seem to think that a control room needs a big display for... stuff. In reality it just "looks good" but doesn't add any real value or increase productivity.
Hi, sorry. Some of your kind downmodded me, so here I go again:
Shut the fuck up already, fanboy. Your signature says it all. And the fact that you iCapitalize every apple trademark.
There are more linux installs out there if you count every embedded device that uses linux, not to mention shitloads of linux servers all over the world. And HUNDREDS of millions of laptops/netbooks for education in developing countries.
And fuck iOS market share. There are a shitload of crappy chinese phones and tablets all over the world.
What's the point in defending apple's market share? Why is it all a pissing contest for you? Fanboys, die already, please.
Shut the fuck up already, fanboy. Your signature says it all. And the fact that you iCapitalize every apple trademark.
There are more linux installs out there if you count every embedded device that uses linux, not to mention shitloads of linux servers all over the world. And HUNDREDS of millions of laptops/netbooks for education in developing countries.
And fuck iOS market share. There are a shitload of crappy chinese phones and tablets all over the world.
What's the point in defending apple's market share? Why is it all a pissing contest for you? Fanboys, die already, please.
How about a mother taking their children to a (male) doctor? Kids are certainly not expecting to be "groped" by that man, but they certainly are. And don't even let me get started on gynecologists...
What? I can post retard comments to slashdot too. Isn't that what you were doing?
Last time I checked, education in the US is free. You don't get tax breaks for home schooling or private schooling. Now rant about that, I'd like to read your opinion.
In a modern capitalist world, the role of the state is making sure that minorities (not in the racial sense, but in the economical sense) have access to the same tools and benefits the "majority" has. The problem with corporate thinking is that it tends to concentrate its resouces in developments that will offer an assured AND short-term return of investment. While this is an efficient policy for corporate, it leaves outside the game to basically everyone not living in a big city. Mid-sized are second, and small cities and towns are often ignored - but can easily be served by a small individual with enough capital.
But rural areas are vast extensions of nothing. Long range WiFi access has been a blessing to many of these communietes - all over the world. These are often working with "lower" grade equipment. Sometimes MikroTik or many other economical wifi solutions (NanoStation), others run on off the shelf hardware. Very few run in true long-range outdoors solutions like WiMAX or Motorola Canopy, because the initial cost is too high for individuals to afford. And this is where "stimulus" funds should go.
The growth (explosive growth) of the internet was ONLY due to the ease of access available through simple phone lines. It was an already-installed network, across the nation. HIGHLY REGULATED, which resulted in a service that was available in even the most remote locations. Broadband was never regulated that way, and as a result of that, there is a huge breach between people with access to broadband, and people still on dialup.
Some argue if there should be stimulus funds at all. Leaving aside that most big companies receive money from the govenrment one way or another (tax breaks to money from their military/aerospace branches, to subsidies), there shouldn't be a discussion IF people in remote locations want or need broadband. They might not want it now, but they surely need it - or will, eventually.
This is an online world. For most people in cities, Internet is a part of their lives, just like electricity and phone service. Do we want people from rural areas coming to the Big City for a better life, because we couldn't provide them with a good life where they lived? Do we want mom and pop farms to disappear because their kids and grandkids got fed up with the country lifestyle? Do we want all farms to be property of Monsanto? Because that's where we're heading.
Disclaimer: I'm not american but here in Argentina we have the same problems. Big cities have good internet and phone service, while smaller cities often have 1 ISP, and small towns either don't have anything or have a single 1mbit connection (that cost $500 a month, really) shared between 100 people over wifi. Local farms either have been bought by corporations, or their owners have been pushed to plant only soybean (which isn't consumed in the country, but exported to China) instead of wheat (which, because of our italian roots, is heavily consumed: bread - which the chinese don't seem to eat), which is missing in supermarkets. Bread price has gone up considerably, and there are days when you just can't get flour.
Pay no attentiont to anti-government conservatives. They all want what's good for companies - not for people. You have the right to bear arms, the civil rights, why can't you have "the right to broadband access" too? Oh yes, because it's the government spending money. We better spend it in warfare, right? Cause the US doesn't really have a big enough budget for "security" and military.
My dad has a Casio FX-702P, complete with, what I think, it's a tape drive interface (dock station with a cable with 3,5MM "headphone" plugs). Both with their original leather sleeves.
I remember trying to type programs in my Commodore 128, from a magazine, at 10 years old.
Xilinx offers a Java-to-VHDL interpreter. Matlab generates VHDL for some stuff (like IIR filters).
But i recommend elite software guys to stay away. They tend to think in abstraction layers, which is fine, but VHDL is all about speed. It's a completely different approach, suited more to hardware guys with a good deal of digital logic background. I'm not,so I have a really hard time with VHDL.
No. ALL FPGAs can be reprogrammed. Field-Programmable gate arrays.
FPGAs don't have programming memory, they need an external chip that holds the program, and downloads it to the FPGA on boot. Ignore OP, he doesn't know shit.
Well, why don't you? The beauty if VHDL is that it's really, really basic. The rest is up to you to implement. Come join us in ##vhdl at irc.freenode.net or try fpga4fun.com. $100 should get you an FPGA training board which you can use to learn.
Slashdot Mirror
Stop confusing anonymity with privacy.
The whole article is a stupid nerd reference to Star Trek. http://en.wikipedia.org/wiki/Replicator_(Star_Trek)
Because DHCP doesn't leave any logs. Cute little anonymous coward, you probably even think you can't be traced just cause you posted anonymous from your browser's incognito mode under Linux!
Yes. The most important one: manageability.
You manage zfs with the "zpool" and "zfs" commads. The filesystem and software raid is one, not md+ext4. If you replace all your drives with larger drives, zfs automagically grows to use all the space. The pool is portable - you can import it to any system without problems.
Anything larger than a few terabyes I call "serious amount". Why? well, think how long it takes to fsck your 250GB drive. Now think how much it will take to fsck 4TB or more - some people can't wait 8 hours for an fsck to finish. ZFS doesn't have fsck - the filesystem is *always* consistent.
The FreeBSD version is a port, ZFS was designed with Solaris in mind. Unices look the same at the command line, but it's the inner workings that make the difference. So I'd rather stick with Solaris, which is what ZFS is developed and tested to work in.
Performance-wise, Solaris wins hands down. In my tests I consistently got 240MB/s reads in Solaris, while Linux was spotted at 160MB/s. No idea why.
Curiously enough, power-efficiency-wise Solaris beats Linux too. My UPS reported a 14% idle load with Linux vs 11% with Solaris. Both had power management enabled, but Linux also had tickless and all sorts of funky PM stuff. FreeBSD's power management is next to non-existant.
If you're building a ZFS storage box, I strongly recommend you get an "HP Microserver". $300 gets you a little box with 4 disk trays, 2 extra SATA ports (need hacked BIOS to enable AHCI for them), and an Athlon II Neo processor. The power consumption of the thing is less than 50W, and it's SILENT. Gigabit Ethernet, VGA port, and 6 USB. It comes with a shitty 1GB RAM (but... ECC RAM!), but it has 2 DIMMs. I just added another 4GB ECC (Kingston generic, KVR1333D3E5), but you can discard the 1GB stick. It comes with a tiny 160GB drive - I just recycled for an old desktop. I run 4x1TB WD Green HDDs. By all means, get WD Greens. They're "slow" (not slower than your wifi) but they run cool and don't waste power.
Careful with 4k sector drives (WDxxxEARS), I don't know about FreeBSD/ZFS but Solaris' aligns to 512-bytes and performance sucks. You will need to google on "ashift" to see the workaround. Also, I'd tell you to get 4 disks instead of 3. You can't add more drives to a vdev - that means: a ZFS storage pool consists of multiple vdevs. Your ZFS pool will consist of 1 vdev of 3x2TB drives. If you want to add a 4th drive, your pool will be 3x2TB + 2TB. No redundancy on that one. You can't extend to 4x2TB from 3x2TB. Since most mobos have *at least* 4 drive connectors, use em or lose em.
Ah yes, never make the "OS pool" the data pool. ALWAYS run the OS from a separate drive. If something goes wrong, at least you can mount the data pool in another machine (or a fresh OS install).
I was talking about guys that but full-tower machines to make 4-way RAID 0+1 arrays, with each disk 20cm apart from the other, and a hard drive cooler (with two fans) for each drive. That's overkill.
Just a small amount of wind running under the drive is enough to keep it cool. No need to keep it at room temperature. 50C is good enough.
Yes, you need forced air (that is, fans). But a few correctly placed fans for the whole case, are enough.
This is nothing new. You've never been in a datacenter before, kid. You can ask a grownup one day and he can take you there and you will feel the heat. And NOISE. No offense, but I think you're one of those gamer kids who builds rigs for max FPS, with esoteric water cooling and silent fans everywhere.
Yeah, no, you don't need to pamper your hardware that much. Even laptop drives work way hot (60C+) for years with no issue.
Most servers are built that way too. The Sun x4500 is extremely densely packed. And there are hundreds running just fine.
The price also includes custom made cases, fans, the power supplies, and custom-made port multiplier SATA backplanes. The custom parts make it pretty expensive, I guess.
RAID-6, really?
After 5+ years working with ZFS, personally, I wouldn't touch md/extX/xfs/btrfs/whatever with a 10 foot pole. Solaris pretty much sucks (OpenSolaris is dead and the open source spinoffs are a joke), but for a storage backend it's years ahead of Linux/BSD.
Sure, you can run ZFS on Linux (I did) and FreeBSD (I do), but for huge amounts of serious data? No thanks.
Very nice but, what's this good for anyway? Nothing. Like every oher "control room big display", this is just there to make it look good in pictures. It doesn't have any real use. I'm not sure if we should blame this on NASA or hollywood. People seem to think that a control room needs a big display for... stuff. In reality it just "looks good" but doesn't add any real value or increase productivity.
Slashdotters love Apple and Google. How much did they contribute?
Hi, sorry. Some of your kind downmodded me, so here I go again:
Shut the fuck up already, fanboy. Your signature says it all. And the fact that you iCapitalize every apple trademark.
There are more linux installs out there if you count every embedded device that uses linux, not to mention shitloads of linux servers all over the world. And HUNDREDS of millions of laptops/netbooks for education in developing countries.
And fuck iOS market share. There are a shitload of crappy chinese phones and tablets all over the world.
What's the point in defending apple's market share? Why is it all a pissing contest for you? Fanboys, die already, please.
Shut the fuck up already, fanboy. Your signature says it all. And the fact that you iCapitalize every apple trademark.
There are more linux installs out there if you count every embedded device that uses linux, not to mention shitloads of linux servers all over the world. And HUNDREDS of millions of laptops/netbooks for education in developing countries.
And fuck iOS market share. There are a shitload of crappy chinese phones and tablets all over the world.
What's the point in defending apple's market share? Why is it all a pissing contest for you? Fanboys, die already, please.
'Muric (fuck yuuuhhhh!!!) is a big country but I'd like to see Paris one day. Sorry, can't drive myself there.
I hope you need urgent medical attention one day, so urgent that it requires you to fly.
How about a mother taking their children to a (male) doctor? Kids are certainly not expecting to be "groped" by that man, but they certainly are. And don't even let me get started on gynecologists...
What? I can post retard comments to slashdot too. Isn't that what you were doing?
I was going to give you a nice long answer, but I realized you were a complete tool.
Last time I checked, education in the US is free. You don't get tax breaks for home schooling or private schooling. Now rant about that, I'd like to read your opinion.
Sure. That's why you live in the fucked up country where, if you don't have money to pay for your health, you die.
Thanks, I'd stick to living here. At least I can get free healthcare. Or if I choose to, I can pay for it.
In a modern capitalist world, the role of the state is making sure that minorities (not in the racial sense, but in the economical sense) have access to the same tools and benefits the "majority" has. The problem with corporate thinking is that it tends to concentrate its resouces in developments that will offer an assured AND short-term return of investment. While this is an efficient policy for corporate, it leaves outside the game to basically everyone not living in a big city. Mid-sized are second, and small cities and towns are often ignored - but can easily be served by a small individual with enough capital.
But rural areas are vast extensions of nothing. Long range WiFi access has been a blessing to many of these communietes - all over the world. These are often working with "lower" grade equipment. Sometimes MikroTik or many other economical wifi solutions (NanoStation), others run on off the shelf hardware. Very few run in true long-range outdoors solutions like WiMAX or Motorola Canopy, because the initial cost is too high for individuals to afford. And this is where "stimulus" funds should go.
The growth (explosive growth) of the internet was ONLY due to the ease of access available through simple phone lines. It was an already-installed network, across the nation. HIGHLY REGULATED, which resulted in a service that was available in even the most remote locations. Broadband was never regulated that way, and as a result of that, there is a huge breach between people with access to broadband, and people still on dialup.
Some argue if there should be stimulus funds at all. Leaving aside that most big companies receive money from the govenrment one way or another (tax breaks to money from their military/aerospace branches, to subsidies), there shouldn't be a discussion IF people in remote locations want or need broadband. They might not want it now, but they surely need it - or will, eventually.
This is an online world. For most people in cities, Internet is a part of their lives, just like electricity and phone service. Do we want people from rural areas coming to the Big City for a better life, because we couldn't provide them with a good life where they lived? Do we want mom and pop farms to disappear because their kids and grandkids got fed up with the country lifestyle? Do we want all farms to be property of Monsanto? Because that's where we're heading.
Disclaimer: I'm not american but here in Argentina we have the same problems. Big cities have good internet and phone service, while smaller cities often have 1 ISP, and small towns either don't have anything or have a single 1mbit connection (that cost $500 a month, really) shared between 100 people over wifi. Local farms either have been bought by corporations, or their owners have been pushed to plant only soybean (which isn't consumed in the country, but exported to China) instead of wheat (which, because of our italian roots, is heavily consumed: bread - which the chinese don't seem to eat), which is missing in supermarkets. Bread price has gone up considerably, and there are days when you just can't get flour.
Pay no attentiont to anti-government conservatives. They all want what's good for companies - not for people. You have the right to bear arms, the civil rights, why can't you have "the right to broadband access" too? Oh yes, because it's the government spending money. We better spend it in warfare, right? Cause the US doesn't really have a big enough budget for "security" and military.
My dad has a Casio FX-702P, complete with, what I think, it's a tape drive interface (dock station with a cable with 3,5MM "headphone" plugs). Both with their original leather sleeves.
I remember trying to type programs in my Commodore 128, from a magazine, at 10 years old.
Xilinx offers a Java-to-VHDL interpreter. Matlab generates VHDL for some stuff (like IIR filters).
But i recommend elite software guys to stay away. They tend to think in abstraction layers, which is fine, but VHDL is all about speed. It's a completely different approach, suited more to hardware guys with a good deal of digital logic background. I'm not,so I have a really hard time with VHDL.
No. ALL FPGAs can be reprogrammed. Field-Programmable gate arrays.
FPGAs don't have programming memory, they need an external chip that holds the program, and downloads it to the FPGA on boot. Ignore OP, he doesn't know shit.
Well, why don't you? The beauty if VHDL is that it's really, really basic. The rest is up to you to implement. Come join us in ##vhdl at irc.freenode.net or try fpga4fun.com. $100 should get you an FPGA training board which you can use to learn.
All media is recordable. Wether the recordability is easy or cheap is another matter.