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Proposed Disk Array With 99.999% Availablity For 4 Years, Sans Maintenance

Chirs checksummed filesystems (243 comments)

The solution for this is checksums and parity on the disk contents at the filesystem level. Read a block off the disk and check the stored checksum against what you read...if it doesn't match then use the parity information to correct the data and store it somewhere else.

8 hours ago
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Proposed Disk Array With 99.999% Availablity For 4 Years, Sans Maintenance

Chirs Wrong N (243 comments)

They have N parity disks, and then roughly N(N-1)/2 data disks and roughly the same number of spares.

In larger arrays the overall overhead of the parity and spare disks is slightly under 50%, or roughly equivalent to RAID-1, but more reliable since the spares can be reassigned as needed.

8 hours ago
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Dell 2015 XPS 13: Smallest 13" Notebook With Broadwell-U, QHD+ Display Reviewed

Chirs virtual machines (108 comments)

I'm writing this on a Dell Latitude with 16GB of RAM. I'd like twice as much. I do OpenStack development and regularly run a couple of controller nodes and a couple of compute nodes. That uses pretty much all of my RAM.

I'd like to be able to simulate a couple of storage nodes as well, and I'd like to be able to have multiple NUMA nodes per compute node to test out the code for simulating NUMA in the OpenStack guest instances.

9 hours ago
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Anonymous No More: Your Coding Style Can Give You Away

Chirs harder to read if there is no consistency (218 comments)

Generally speaking each project has a coding style that most code in the project adheres to, for the simple reason that it's easier to maintain when the code all looks more-or-less similar.

If one area uses lowercase with underscores, and the other area uses CamelCase, and one area typedefs the heck out of everything while the other is explicit, then for someone coming in and trying to understand the code it makes it harder than necessary to figure out what's going on.

So if you look at the linux kernel, or glibc, or firefox, or Chrome, or any other similarly large project, there will be some sort of coding style that applies. This is not to say that the style applies blindly. For example there are areas in the kernel where they basically imported a driver that is written in a different coding style. Since that driver is maintained out of the linux kernel tree and is largely self-contained, that was deemed to be acceptable. And even in that case, the driver used an internally-consistent coding style for all the files involved.

2 days ago
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The iPad Is 5 Years Old This Week, But You Still Don't Need One

Chirs get a smartphone with no data plan then... (289 comments)

I bought a Moto G on sale, and I have a cheap cell plan with no data. Works fine 99% of the time.

2 days ago
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The iPad Is 5 Years Old This Week, But You Still Don't Need One

Chirs why not? (289 comments)

Bluetooth headset/handset and voice recognition would let you keep the tablet in a bag/rucksack/etc. and interact with it remotely.

2 days ago
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The iPad Is 5 Years Old This Week, But You Still Don't Need One

Chirs battery, probably (289 comments)

With most high-end phones having glued-in batteries now, after a couple years the battery is starting to go.

Most people don't use their tablets as much, so the battery lasts longer.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs disagree (234 comments)

The most powerful IED that could be transported by a recreational drone would be one carrying a model rocket engine. These contain PETN solid fuel, which is a high explosive. With clever design, this solid fuel engine could be used to make a small explosion. The problem? This would be at most enough to damage a few windows, and maybe maim somebody at point blank range.

What's "recreational" in this context?

The M18A1Claymore mine weighs under 4lbs and fires roughly seven hundred steel pellets like a shotgun. The proposed Amazon Prime Air drones could carry a bit over 5 lbs, so could easily mount a Claymore.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs movie stars too... (234 comments)

Apparently there is a company doing booming business selling drone detection systems to movie stars and other famous people. Gives them enough warning to cover up or go inside.

So anyone with money can get drone detection already. Drone destruction might be another story...though I wouldn't be surprised if that comes eventually too.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs banning is not the answer (234 comments)

Nowhere did I call for banning drones, I just pointed out that they're a real issue, not some invented thing.

Personally I think the solution for drones would be a sensor net combined with some kind of EM weapon (laser/maser/EMP/etc.) to shoot down the drone before it gets to the intended target.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs restricting drones generally doesn't make sense (234 comments)

What does make sense is a radar/acoustic/lidar "fence", with some sort of point-defence laser/maser/EMP/etc system to disable drones that enter restricted airspace around sensitive areas.

On of the issues will be minimizing collateral damage--debris raining down on people, backscatter from the radiation pulse, missed shots hitting innocent people/equipment, etc.

2 days ago
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Uber Capping Prices During Snowmageddon 2015

Chirs Re:So what will this accomplish? (152 comments)

Uber's pricing varies with demand, cabs don't. So if it's a busy time then you'll either pay more for immediate service with Uber, or else wait longer for a normal cab. It's up to the consumer.

2 days ago
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Uber Capping Prices During Snowmageddon 2015

Chirs why is the cap a good idea? (152 comments)

Hypothetically speaking, if I'm desperate to get somewhere, and I'm willing to pay *whatever it takes*, why is it a good idea to limit the surge pricing?

If raising the price from 1.0 to 1.5 raises the number of drivers considerably, what about raising it from 3.0 to 4.5? In both cases the price increases by the same multiplier.

Or what about having an auction system where each person that wants a ride indicates how much they're willing to pay for it? Would you want to cap that as well?

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs might blind someone if you're shooting low (234 comments)

Unless you're shooting steeply upwards, a miss might blind someone. Heck, if it's bright enough even the backscatter from hitting the drone might cause eye damage.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs shooting down with laser has problems (234 comments)

I thought of point defence laser too, but it's got problems. You'd have to be awfully careful about where it was pointing when it fired, otherwise you'd run the risk of blinding civilians in any buildings within line-of-sight.

Realistically you'd probably be better off with a number of lasers mounted around the perimeter so that they shooting more-or-less upwards. Less chance of collateral damage that way.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs and when the next one has a bomb? (234 comments)

Mount a claymore to the underside of a drone, fly it in at high speed doing evasive maneuvers, trigger it over the biggest group of people that it sees.

Could be fully autonomous, and it'd be really hard to shoot down when you're worried about where the bullets end up when they fall back down to earth. I suspect a mostly-plastic drone would be hard to see on radar.

2 days ago
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White House Drone Incident Exposes Key Security Gap

Chirs and when the next one is carrying explosives? (234 comments)

It wouldn't take a huge drone to bring in a big enough bomb to do major damage. Heck, you could probably put a rifle on some of the bigger ones.

It'd be really hard to shoot down a mostly-plastic drone coming in at high speed doing evasive maneuvers.

2 days ago
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OpenBSD's Kernel Gets W^X Treatment On Amd64

Chirs would you like pie or cake? both! (84 comments)

In the english language itself, "or" doesn't necessarily imply "xor". Usually some other mechanism is used to imply exclusivity, either from situational awareness or from context in the surrounding text.

about two weeks ago
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The Legacy of CPU Features Since 1980s

Chirs depends what you're doing (180 comments)

For example, I worked for a decade in the linux kernel and low-level userspace. Assembly definitely needed. I tracked down and fixed a bug in the glibc locking code, and you'd better believe assembly was required for that one. During that time I dealt with assembly for ARM, MIPS, powerpc, and x86, with both 32 and 64-bit flavours of most of those. But even there most of the time you're working in C, with as little as possible in assembly.

If you're working in the kernel or in really high-performance code then assembly can be useful. If you're working with experimental languages/compilers where the compilers might be flaky, then assembly can be useful. If you're working in Java/PHP/Python/Ruby/C# etc. then assembly is probably not all that useful.

about two weeks ago
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Unbundling Cable TV: Be Careful What You Wish For

Chirs torture can work in some circumstances (448 comments)

From what I understand, torture can make most people talk, but can't make them tell the truth. So if you're looking for easily-verified information it might be effective. If you're looking for information that is hard to verify, then it might not work as well.

And even if torture does make people talk, there may be other less brutal (and possibly more effective) ways of getting the same information.

about three weeks ago

Submissions

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skydiver to attemp record jump from 131,000 feet

Chirs Chirs writes  |  more than 6 years ago

Chirs (87576) writes "Former 64-yr old french paratrooper Michel Fournier is attempting to break multiple world records by jumping out of a helium balloon at 40 kilometers (131,000 feet) altitude. They anticipate that he will break the sound barrier on the way down, taking 15 minutes to fall and reaching speed of over 1500km/hr.

The big concern at the moment is the wind. Anything over 10km/hr will cause problems getting the massive balloon inflated. The previous attempt failed when the baloon was destroyed by wind while still on the ground.

Some links: CNN Canadian Press Canada.com"

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