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The State of ZFS On Linux

flux Re:Unfamiliar (366 comments)

It's performing a checksum of your entire system. That's going to be a CPU hog. BTRFS will be no different in this regard.

Well, my btrfs scrubs 1.3 gigabytes per second and chances are it's IO-bound on the RAID10 SSDs, so if ZFS scrubbing performance is comparable, I would say it's not a CPU hog.

You can add a new disk to a pool. You can add a new mirror or Z vdev to a pool.

You make it sound such a petty limitation. But if you do have 5-device raidz and a pool, you are not going to add a single device to the system without risking data durability, you need to add at least two so you can mirror them, and then you're wasting space compared to parity-raids.

about a week ago

Microsoft Paid NFL $400 Million To Use Surface, But Announcers Call Them iPads

flux Should have saved the money (405 comments)

I bet they could've bought the announcers to say they are Surfaces for less money.

about a week ago

Moto 360 Reviews Arrive

flux Re:Battery consumption due to CPU? (87 comments)

Meh, I was hoping some kind of dim OLED MIP display that would display always, like in N9 (though I did notice it was not mentioned in the specs) - it would have explained why most of the clock displays had dark background.

There are accelerometers that can queue many samples and then pass them to the CPU in one go (ie. 100 samples) and in addition they can have thresholds for interrupts. If your CPU is going to be woken once a second - assuming 100 Hz sampling rate, which is quite nice - then it doesn't really sound that bad, unless you have bad power saving functionality either in the CPU or in the operating system.

I suppose BLE doesn't need to take that much energy either if you grant a few seconds latency from notifications to actually displaying them.

There's always hoping they can improve the battery usage with firmware upgrades..

about two weeks ago

Moto 360 Reviews Arrive

flux Battery consumption due to CPU? (87 comments)

Everyone keeps saying how this doesn't have the latest most powersaving CPU but how much CPU does this device even need? Once a second to update the hand? Or could even be a few times a minute for a smooth minute hand.

I would be surprised if the overwhelming majority of the amperage doesn't go to the display and the BLE radio (in that order), the CPU coming last.

about two weeks ago

Moto 360 Reviews Arrive

flux Circular LCDs (87 comments)

The addressing of LCDs is inherently cartesian, but I don't see why it means the display itself must be as well. The space not on the display is not wasted, there are not physical pixels being hidden here. Instead, the device provides the user with more free physical space compared to one with square screen, not to mention nicer look.

about two weeks ago

Ask Slashdot: Linux-Friendly Desktop x86 Motherboard Manufacturers?

flux Re:MSI Claims SteamOS compatibility with X99 (294 comments)

Though the AsRock board I bought is able to download the BIOS upgrade itself from within the BIOS, so that works regardless the OS. (Also it has a switch for choosing from two BIOS flash regions, so it should be pretty safe.)

about two weeks ago

seL4 Verified Microkernel Now Open Source

flux Re:Proof (82 comments)

While there have been some Linux bugs due to the compiler, I can't really recall hardware problems that have caused security problems â" unless you already have physical access, and then all bets are off.

The compiler issue could be addressed by using a certified compiler, such as this: . Sadly CompCert is not FOSS.

about 1 month ago

Intel Offering 3-D Printed Robot Kits

flux Re:Software not hardware (26 comments)

Are you familiar with ROS, ? It's basically a set of libraries for various robotics tasks and sounds like what you're describing.

about 3 months ago

Microsoft Runs Out of US Address Space For Azure, Taps Its Global IPv4 Stock

flux Re:Where is IPv7? (250 comments)

Well, v4 doesn't require remembering IPv4 addresses either, but still it comes handy in a pinch to remember the gateway, the dns server, the WLAN access point, etc addresses. For some reason people really like to point out the Google's DNS server's IP, not its name.

Though remembering local gw and dns mostly comes to remembering the network prefix whcih won't be that large, assuming one has not used dynamic allocation for services in a network.

about 3 months ago

Tux3 File System Could Finally Make It Into the Mainline Linux Kernel

flux Re:YASF (c) forver by me (121 comments)

Not sure if trolling.. but I looked it up, and on the paper it seems interesting, but for use today it has limitations: 2 TB maximum device size, 8 TB maximum volume size. So that's a non-contender. Seems quite advanced for its day, though (introduced 1998).

about 4 months ago

Emory University SCCM Server Accidentally Reformats All Computers Campus-wide

flux Re:An...accident..? (564 comments)

Maybe the malware was deeply employed in all the install images, and now it is guaranteed that all the systems have it, even after re-deploying ;).

about 4 months ago

Should Microsoft Be Required To Extend Support For Windows XP?

flux Re:Where do you draw the line? (650 comments)

Actually Google already gave the Wave to the Apache foundation, so I guess they're set from that point of view.

That aside, I don't think a company should be forced to provide any level of support for a ten-year-old product. They could even be up-front about ("this product will not be supported for longer than five years") and people still wouldn't care. Well, until the day came.

about 5 months ago

Bitcoin Exchange Flexcoin Wiped Out By Theft

flux Re:surprised!!!! (704 comments)

I think it would be more effective to time the attacks when the sums involved are significant. Now they mostly server as a cautious example that new exchanges will learn from.

And it's probably better they learn their lessons now rather than later.

about 6 months ago

Ask Slashdot: Effective, Reasonably Priced Conferencing Speech-to-Text?

flux Re:There isn't any... (81 comments)

A microphone array and some DSP should have no trouble distinguishing between sound sources at distinct points in space, in addition to removing background noise.

about 9 months ago

Amazon Uses Robots To Speed Up Human 'Pickers' In Fulfillment Centers

flux Re:Dice Strikes Again... (184 comments)

I wondered that as well, but the video makes it clear: this way the shelves can be queueing for the worker.

about 9 months ago

Ask Slashdot: Why Are Tech Job Requirements So Specific?

flux Reducing number of candidates (465 comments)

If you can reduce the number of candidates you need to evaluate and interview, you are saving plain money. More effective to have them do the filtering in a distributed manner.

Of course, you might miss the perfect candidate that way as well. But, you cannot really put a price to that.

about 10 months ago

Software Developer Says Mega Master Keys Are Retrievable

flux Re:Problem is dedupe (136 comments)

There is a way to do dedup without having the key.

For example: the client takes an SHA256 of the data, then encrypts the data it with the lowest 128 bits of the SHA1, uploads the encrypted data to the server saying "this data has id ". The lowest 128 bits are then encrypted with the client key and uploaded as well. This way another party with the possession of the same data gets the server to merge their data (but the key still keeps hidden from the server). Servers makes an SHA1 sum of the encrypted data so that clients can quickly check if the data they are deduping is properly stored to dwarf data integrity attacks.

Not sure if this was the way Mega does it but it was something pretty close to it.

1 year,15 days

Software Developer Says Mega Master Keys Are Retrievable

flux Re:what's odd about this? Your key is local (136 comments)

Just like your OS vendor can slip in an update that sends all your keys to them. (As Shuttleworth said, they have root.) You basically need to trust someone, as no one person is able to audit everything people typically use daily.

1 year,15 days

Ask Slashdot: Asynchronous RAID-1 Free Software Backup For Laptops?

flux Re:Btrfs send & receive (227 comments)

irc: FreeNode #btrfs

But be pacient, people are probably not responding immediately. Then there is also the mailing list.

about a year ago

Ask Slashdot: Asynchronous RAID-1 Free Software Backup For Laptops?

flux Re:Btrfs send & receive (227 comments)

I lose the btrfs functionality of it repairing bad blocks. I'm pretty sure md doesn't notice the error if it doesn't come from the backing device in the form of an IO error.. So if btrfs gets a bad block from md, there's not much to be done, except to make a guess which of the mirrors has the copy and manually resync (if btrfs manages multiple devices, it can just do that automatically). I don't know how that would be even done. But at least I would know which file has the error and I can restore it from the backups. Metadata is duplicated so that shouldn't be an issue.

I also lose the ability to change the data layout at ease; in btrfs going from raid10 to raid1 to raid0 or adding new devices is just a matter of running btrfs balance (and btrfs device add). Md doesn't even support adjusting the number of devices in raid10 array, nor conversions from raid1 to raid10 (that can be done manually, but you don't have redundancy during the process).

In future I may lose the forthcoming ability to set redundancy level per subvolume or possibly even per directory/file.

about a year ago


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