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• In general, do 3rd-party laptop AC adapters / chargers work reliably?

  - by MGOwen

  The AC adapters for my 2 dell laptops wore out very quickly. One supplies power but won't charge the battery (it's about 3 years old, the other is a bit newer). Both have worn through to the shielding around the notebook connector and look like they'll be unusable soon. Checking user reviews of the replacement adapter on Dell's own website, it appears they usually fail this fast. Apparently Dell does this deliberately to make money (their adapters sell for about 10-15 times what they cost to make). Same with replacement batteries. I can see there are plenty of much cheaper ($50 less) compatible AC adapters on eBay. Does anyone have experience with these? Naturally I'm nervous a crappy knock-off could fry my notebook, but has this ever actually happened to anyone recently? Has anyone had a good experience? Can anyone recommend a good online seller (who doesn't charge nonsensical shipping costs to Australia, preferably?)

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• Interface to collect successful remote backups status

  - by Aseques

  I would like to deploy into our infrastructure a web interface that could register when the copies are finished and if for some reason they haven't. The current issue is that we are doing on site backups for customers, for each backup a mail is sent ad the end of the backup, the problems is that sometimes the mail isn't sent for a variety of reasons: System doesn't have internet Backup system crashed before sending the mail etc.. What I'd like to do is to have a web interface that the backup software cant visit after doing the backup (either if it's a success or a fail), that acknowledges that the backup has finished, after some time, I'd like to receive a report of the machines that hadn't done the backup. Is there anything remotely similar to this that I could use/adapt to our environment? UPDATE: Just found out this (paessler.com) that seems to be a privative solution of what I intended.

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• Transfer Raid Drives to External Enclosure

  - by dubbeat

  I have 2 raid disks (a grand total of 360GB) in my laptop. I'm fast running out of space and want to install new drives. I've a pretty good idea how to do this. My question is what can I do with the drives that I remove? I've got lots of media files on these drives that I'd like to keep and maybe transfer back onto my laptop once I have the new drives installed. Bearing in mind that I know next to nothing about hardware how do you suggegst I go about reusing the removed drives somehow? Thanks,

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• Lexing newlines in scala StdLexical?

  - by Nick Fortescue

  I'm trying to lex (then parse) a C like language. In C there are preprocessor directives where line breaks are significant, then the actual code where they are just whitespace. One way of doing this would be do a two pass process like early C compilers - have a separate preprocessor for the # directives, then lex the output of that. However, I wondered if it was possible to do it in a single lexer. I'm pretty happy with writing the scala parser-combinator code, but I'm not so sure of how StdLexical handles whitespace. Could someone write some simple sample code which say could lex a #include line (using the newline) and some trivial code (ignoring the newline)? Or is this not possible, and it is better to go with the 2-pass appproach?

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• What RAID level for a backup server?

  - by ispirto

  I'm building a server with 12 x 3TB disks to use daily backups. I'm thinking to use RAID50 to get a good 27TB usable space. The disks will be used brutally to backup 9 servers with 1.5TB of data once a day. I'll keep the backups for 2 days. So for each server I'll have 3TB of separate partitions. Do you think this kind of huge backups would stress the disks too much and make them fail? Should I better go with RAID10? Oktay

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• Logitech Mouse stopped working after changing batteries!

  - by Martti Laine

  I just changed batteries for my optical wireless Logitech mouse, but it stopped working; When I put it on, it waits a second and then keeps the green light for few seconds. After that it just stops responding and doesn't show the light even if I'm moving it. Does this have something to do with batteries? I took new, so they're not empty. And I think it cannot be on batteries, because it keeps the light first, but then just stops responding. Please help, I would be very very thankfull. This makes me mad to use this mousepad :D EDIT: Wow, what an fast answer!! Thank you, but you wanted to know this mouse? I think it's Logitech M205, watched from Logitech site, because have not the original package anymore :S I couldn't find any buttons in receiver, but mouse has button called "reset". Is that the right one?

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• zeroconf (bonjour/avahi): macs do not see linuxes and vice versa

  - by codesnik

  In my home network I have several OS X boxes and several Ubuntu boxes. each Ubuntu box sees other boxes via zeroconf. I can "ssh ubuntu1.local" and "ping ubuntu1.local" from "ubuntu2.local", but both fail to lookup OSX boxes. and other way around, I can "ssh mini1.local" from "mbair.local". but it doesn't see "ubuntu1.local" why? do ubuntu and osx use different flavours of zeroconf? could be ubuntu, or osx tweaked to use common flavour?

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• Another question about ASP.NET MVC and a separate project for helper classes

  - by rockinthesixstring

  I know this topic has been discussed to death, but there is one thing that I can't wrap my head around. I'm working on a Web Application using ASP.NET MVC and I come across a scenario where I need a helper class (this usually happens in the early stages of development. So I go ahead and create a helper project in my solution that I use to manage all of my Helper Classes. Now, do I have to build that project and dump the dll in the bin directory every time I make changes to is, or is there a way to have the main web application reference the classes contained within the separate project without the separate build process? I'm just looking for the easiest way to add helper classes without the hastel of building and moving the dll every time I make a change or addition. Also, sorry for the very newbie-esque question here. All of the web apps I've build in the past have all been in the same project (web forms, App_Code, etc).

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• Web design process with CSS - during or after?

  - by SyaZ

  Which is the better practice? Add CSS during web designing you can see the result (or close) as early as possible and make required changes. You also know how many divs or spans you might need (eg to make curved cross-browser hover background). But as you add more and more components to the page sometimes things get hack-ish as you need to patch here and there to get the exact design required. Add CSS after finishing page design you can see the page overall structure as it is well, without styles. You get to see how accessible your site is, and modify it right away if it's not good enough (unlike the former case where you may break multiple CSS rules). Plus after you finished it, you only need to spend most of the time to alter only the CSS file, which is good to get the momentum going. Granted I have never tried the latter approach, but am seriously considering it for my next project if I can see convincing reasons -- or if it's no good at all. Thanks.

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• Will there be IQueryable-like additions to IObservable? (.NET Rx)

  - by Jason

  The new IObservable/IObserver frameworks in the System.Reactive library coming in .NET 4.0 are very exciting (see this and this link). It may be too early to speculate, but will there also be a (for lack of a better term) IQueryable-like framework built for these new interfaces as well? One particular use case would be to assist in pre-processing events at the source, rather than in the chain of the receiving calls. For example, if you have a very 'chatty' event interface, using the Subscribe().Where(...) will receive all events through the pipeline and the client does the filtering. What I am wondering is if there will be something akin to IQueryableObservable, whereby these LINQ methods will be 'compiled' into some 'smart' Subscribe implementation in a source. I can imagine certain network server architectures that could use such a framework. Or how about an add-on to SQL Server (or any RDBMS for that matter) that would allow .NET code to receive new data notifications (triggers in code) and would need those notifications filtered server-side.

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• Grails domain class initialization

  - by Don

  Hi, My Grails app has the following Spring bean defined in spring/resources.groovy calendarService(CalendarService) { bean -> bean.initMethod = "init" } This method looks something like: class CalendarService { void init() { User.findByEmail("[email protected]") } } When I call the dynamic finder findByEmail I get a MissingMethodException. My guess is that I'm trying to call this method too early, i.e. before the domain classes have had the dynamic finders added to their metaclass. One solution would be to call CalendarService.init() myself from Bootstrap.init, rather than instructing Spring to call it, but is there a better solution? Thanks, Don

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• Why FreeBSD won't reboot after kernel crash?

  - by Max Kosyakov

  Once in a while I get my server running FreeBSD 8.0 amd64 fail due to bad memory (incompatible with motherboard) modules. Each time it happens, the box stalls with the last note saying that it will automatically reboot in 15 second, but it never does. How do I fix this? I need computer to reboot after kernel crash, unattended. (Please do not recommend to replace memory, as soon as I get the modules, I will, but I need a quicker solution that will not require me to stand still next to the box just to press the reset button each time it crashes.)

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• Haproxy Slow Reload in DB Mode

  - by com

  Recently I started using great tool for load balancing - Haproxy. There is only one disturbing thing that I cannot figure out how to deal with it. We use haproxy for load balancing mysql traffic. When there is a lot of traffic and many connection it takes ages for haproxy to reload (~ 30 min), with less traffic it doest reload within 1 min. I do reload with: service haproxy reload Of course if I need to do an urgent change in configuration I expect haproxy to do reload very fast. Killing haproxy instances waiting for disconnection causes to disconnection of msyql connections. It looks like that I made mistake in settings of haproxy or in settings of application. If you know how to solve this please help me. Thanks!

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• How to make a quiet laptop?

  - by psihodelia

  Most modern laptops have very noisy fans. I am looking for a quiet laptop or a small stationary computer which has all its hardware built in a display. Most tasks will be PDF/docs processing, real-time audio processing, web-surfing and Skype video chats. Certainly, there is no any fan-less model today; but maybe some of the existed laptops do not switch on their fans so often or implement different solutions? For example, an iPad has no fan at all and it is fast enough for my needs, but it has no normal operating system, so I can't use it for anything but audio chats and web-surfing. Or maybe I can buy a laptop and tweak it to make it absolutely noiseless? Can you recommend any solution please?

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• Sharing soundcard to network.

  - by zerkms

  Let's suppose I have a laptop (L) and desktop PC (D), both with Windows 7 onboard. It is SB X-Fi extreme soundcard with rather good 5.1 home theater connected. But it is not comfortable to watch video sitting on the sofa from my desktop (sofa is in the center of the room and D is in the corner), even though it is 23" monitor. So I'm watching everything from the laptop. So the question - is it possible somehow to "share" soundcard from D to L, so I will watch the video from notebook and listen the sound from the 5.1? L and D are connected via wi-fi (fast enough).

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• Impossible to stop raid device

  - by Traroth

  I'm trying to stop a RAID disk in order to replace it by a new one, as this one is not working properly. I'm typing mdadm --stop /dev/md1, and I'm getting an error message: mdadm: fail to stop array /dev/md1: Device or resource busy I'm getting this message even if I reboot the server, and I can't see a process that could cause this. The server is working under a Debian with a 2.6.18-4-amd64 kernel. Could you help? Edit: Mote details about what my colleague tried out. After unmounting sda1, the command mdadm --remove /dev/md0 /dev/sda1 worked. But now, we still have an error message after mdadm --remove /dev/md1 /dev/sda5: mdadm: hot remove failed for /dev/sda5: Device or resource busy I still don't understand completly how the different partitions are mounted, so I suppose there is something I don't understand in the currenct situation...

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• WPF/.NET data access models - resource recommendations

  - by jasonk

  We're in the early design/prep phases of transferring/updating a rather large "legacy" 3 tier client-server app to a new version. We’re looking at doing WPF over Winforms as it appears to be the direction Microsoft is pushing development of the future and we’d like the maximize the life cycle/span of the apps. That said during the rewrite we’d like to make as many changes to our data access/presentation model to improve performance as much as possible up front as many. I’ve been doing some research along that vein but the vast majority of the resources I've found that discuss WPF focus only simple data tracking apps or focus on the very basics UI design/controls. The few items that even discuss data presentation are fairly elementary in depth. Are there any books/articles/recommended reading/other resources recommended for development related to large enterprise level business apps? Any “gotchas” that should/could be avoided? General advice to minimize the time underwater

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• Is there a way to stream wirelessly from a laptop to a TV?

  - by Robsta

  I heard of such a thing like a box or a media player such thing that can connect wirelessly to stream movies from my laptop? Is there such a thing that can do it? How is the latency on it? I have fast internet so that's not an issue, or is there such a box that connects with Bluetooth for better connection? I need these box to also be able to browse the internet because I'd like to stream movies from YouTube. I have heard of a thing called boxee, but is that what I'm looking for? I have windows 7 as my os, with an HDMI out and a GPU with a 555m. My laptop is powerful enough and my internet is 25mbps with a cap of 150GB. All i would really like to know is what this device is called? A media box?

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• Configuring sendmail to use one outbound MTA exclusively

  - by Charlie Martin

  I have a sendmail problem, and I'm anything but a sendmail guru -- I could use some help. My problem is that I have a system intended to be more or less an "appliance" -- it's not intended to have an admin. Because of this, it needs to be able to "call home" by sending email. As we have configured it, this works fine -- using sendmail, it finds the appropriate relay by looking up an MX record and everything works fine. Now, however, because of security concerns, we want to limit it to using exactly one relay, so for example relay.corp.example.com. Should the user configure it to use, say, fubar.example.com, the mail sending should fail or be deferred. I thought that by configuring sendmail with a /etc/mail/server.switch file containing hosts files without dns, I'd get that effect. This doesn't work -- instead, if it gets mail addressed to [email protected], it tries to talk directly to example.com, and ignores the configured server. Any ideas?

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• Access points fighting for dominance?

  - by Phillip Oldham

  We have a small office with a large number of wireless devices (a mixture of desktop machines, laptops, and wifi-enabled phones) all working from a single Apple Airport Extreme which extends our wired network. I've added another Airport Extreme for resiliency, since we've been seeing a decrease in performance and (as far as I understand) access points can only handle a small number of clients. I set the new AP to extend the current network so that the clients weren't constantly switching between different wireless networks, however as soon as this AP was configured all the wireless devices started seeing network trouble, flicking on and off. I'm assuming that this is because both APs are reasonably strong, and the client can't decide which to use. What is the best route to follow to resolve this? What I'm aiming for is wireless resiliency; preferably having two APs share the network load, or if this isn't an option then having a primary AP with a "fail-over", should the primary go down for any reason.

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• buying a computer wondering about the pit falls of haveing a 64 bit OS

  - by biladsf

  _I am getting a custom laptop, i only do .net development, i dont play games or download gbs of video/music. I just want a fast computer. Right now in order to get 8gbs of ram i have to have the 64 bit version of 7. I need to know the following: What pitfalls could i encounter. i know a lot of apps out there are not 64 bit apps and only come in 32 bit version. Business Intelligence Development Studio is a good example. _

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• Credentials needed for BT line on Netgear router

  - by Bali C

  I have recently bought a new Netgear router to replace my current BTHomeHub as it doesn't support wireless. I did buy a WAP but figured it would be easier to use a router with wireless built in. (It's a modem/router combo). I have got as far as setting up the router on the web interface, but then it asks for a username and password to connect to the net, I can only assume this is for the phone line? I have tried some passwords I could find written down but they don't work, the internet light comes on and then when the creds fail it goes off. I have been on the homehubs web interface and been through all the settings it has to find the credentials it is using which obviously work, but no joy. Is there anything obvious I am missing, or is there a way I can retrieve my settings from my existing router? Any pointers will be very appreciated.

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• What is the simplest way to confirm or to disprove that Virtual Box virtual machines support GRE protocol

  - by mbaitoff

  It is stated in VirtualBox manual (chapter 6) that VM network interfaces in "NAT" mode do not support GRE protocol. I'm currently trying to setup a pair of VMs as pptp server and client which would communicate via VM's network interfaces in "INTERNAL NETWORK" mode. I set up modern Linux OSes with pptp software on both machines and made some basic pptp configuration. However, I fail to connect the client to the server - server reports a failure when writing to GRE socket. I now need a quick proof of principal ability to use the GRE protocol between VirtualBox VMs over a network in "INTERNAL" mode, such as a several-line .c program that would try to open/send/receive/close a GRE protocol connection, or like a specific lightweight tool to diagnose the GRE availability. Any suggestions?

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• Prevent auto forwarding NDR loops

  - by DemonWareXT

  a week ago we experienced a really sweet problem at a client of ours. They are a school with around 1200 users, and everyone of them has auto forwarding for all mail activated. We use Exchange 2010 Now a few of the users where able to make NDR loops by adding 2 different, wrong, destinations. We had around 80k mails sent within a few hours. Not very practical. My question is, does anyone know a good way to prevent something like this. I have found 2 ways, which both fail for their own reasons We could manage the auto forwarding on the exchange host itself, which should prevent this looping problem someone said. But 1200 Users, not on my watch. There is a Powershell script out in the wild which should work against that, but my employers want something more "professional" Thank you very much for your support Linus

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• Again, what version control system to choose?

  - by Ivan

  Please excuse me for probably a newbie hundred-times-chewed question. I have no experience with version control systems except of using Visual Source Safe in a project done by 2 people sitting in front of each other (which has shown VSS quite sack of boulders, not anything useful). Right now I am looking to grok-in using some modern VCS. Here are the preferences in descending priority order: Platform-agnostic. Pretty pleasant to use With Visual Studio 2010 on Windows as well as With NetBeans 6.9 and Eclipse 3.6 on Linux and Mac. Convenient and efficient for mutually-dependent projects done by teams of 1-10 and consisting of files of quite a diverse selection of types. Including early-stage projects with unstable design and experimenting. Modern. As fresh and future-technology-feature-rich as possible. Free & open-source. Should I take a closer look at SVN, Mercurial, GIT, Bazaar, or something else?

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