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• What’s the opposite of abstraction?

  - by Ollie Saunders

  As I understand it, abstraction is the term we use for when more meaning is created out of something simpler without altering it. It is derived from the latin verb abstrahere (to ‘draw away’). For instance, text is just one abstraction of binary data—as are bitmaps. So, in computers, text and bitmaps exist on top of (are implemented in terms of) binary data. My question is: what is the opposite term? If I want to know the possible more basic things that bitmaps could be implemented in terms of other than binary data—things like tiles for a mosaic or fabric patches for a patchwork quilt—what am I asking for? Is there a word for that? Abstraction has connotations of generalization and the opposite process of that is specialization. IDK whether that helps.

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• Connection Pooling is Busted

  - by MightyZot

  A few weeks ago we started getting complaints about performance in an application that has performed very well for many years.  The application is a n-tier application that uses ADODB with the SQLOLEDB provider to talk to a SQL Server database.  Our object model is written in such a way that each public method validates security before performing requested actions, so there is a significant number of queries executed to get information about file cabinets, retrieve images, create workflows, etc.  (PaperWise is a document management and workflow system.)  A common factor for these customers is that they have remote offices connected via MPLS networks. Naturally, the first thing we looked at was the query performance in SQL Profiler.  All of the queries were executing within expected timeframes, most of them were so fast that the duration in SQL Profiler was zero.  After getting nowhere with SQL Profiler, the situation was escalated to me.  I decided to take a peek with Process Monitor.  Procmon revealed some “gaps” in the TCP/IP traffic.  There were notable delays between send and receive pairs.  The send and receive pairs themselves were quite snappy, but quite often there was a notable delay between a receive and the next send.  You might expect some delay because, presumably, the application is doing some thinking in-between the pairs.  But, comparing the procmon data at the remote locations with the procmon data for workstations on the local network showed that the remote workstations were significantly delayed.  Procmon also showed a high number of disconnects. Wireshark traces showed that connections to the database were taking between 75ms and 150ms.  Not only that, but connections to a file share containing images were taking 2 seconds!  So, I asked about a trust.  Sure enough there was a trust between two domains and the file share was on the second domain.  Joining a remote workstation to the domain hosting the share containing images alleviated the time delay in accessing the file share.  Removing the trust had no affect on the connections to the database. Microsoft Network Monitor includes filters that parse TDS packets.  TDS is the protocol that SQL Server uses to communicate.  There is a certificate exchange and some SSL that occurs during authentication.  All of this was evident in the network traffic.  After staring at the network traffic for a while, and examining packets, I decided to call it a night.  On the way home that night, something about the traffic kept nagging at me.  Then it dawned on me…at the beginning of the dance of packets between the client and the server all was well.  Connection pooling was working and I could see multiple queries getting executed on the same connection and ethereal port.  After a particular query, connecting to two different servers, I noticed that ADODB and SQLOLEDB started making repeated connections to the database on different ethereal ports.  SQL Server would execute a single query and respond on a port, then open a new port and execute the next query.  Connection pooling appeared to be broken. The next morning I wrote a test to confirm my hypothesis.  Turns out that the sequence causing the connection nastiness goes something like this: Make a connection to the database. Open a result set that returns enough records to require multiple roundtrips to the server. For each result, query for some other data in the database (this will open a new implicit connection.) Close the inner result set and repeat for every item in the original result set. Close the original connection. Provided that the first result set returns enough data to require multiple roundtrips to the server, ADODB and SQLOLEDB will start making new connections to the database for each query executed in the loop.  Originally, I thought this might be due to Microsoft’s denial of service (ddos) attack protection.  After turning those features off to no avail, I eventually thought to switch my queries to client-side cursors instead of server-side cursors.  Server-side cursors are the default, by the way.  Voila!  After switching to client-side cursors, the disconnects were gone and the above sequence yielded two connections as expected. While the real problem is the amount of time it takes to make connections over these MPLS networks (100ms on average), switching to client-side cursors made the problem go away.  Believe it or not, this is actually documented by Microsoft, and rather difficult to find.  (At least it was while we were trying to troubleshoot the problem!)  So, if you’re noticing performance issues on slower networks, or networks with slower switching, take a look at the traffic in a tool like Microsoft Network Monitor.  If you notice a high number of disconnects, and you’re using fire-hose or server-side cursors, then try switching to client-side cursors and you may see the problem go away. Most likely, Microsoft believes this to be appropriate behavior, because ADODB can’t guarantee that all of the data has been retrieved when you execute the inner queries.  I’m not convinced, though, because the problem remains even after replacing all of the implicit connections with explicit connections and closing those connections in-between each of the inner queries.  In that case, there doesn’t seem to be a reason why ADODB can’t use a single connection from the connection pool to make the additional queries, bringing the total number of connections to two.  Instead ADO appears to make an assumption about the state of the connection. I’ve reported the behavior to Microsoft and am awaiting to hear from the appropriate team, so that I can demonstrate the problem.  Maybe they can explain to us why this is appropriate behavior.  :)

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• .NET Rocks VS2010 Road Trip

  - by Blog Author

  .NET Rocks!! is going on the road again in honor of the release of VS2010, and here are the details: Carl and Richard are loading up the DotNetMobile (a 30 foot RV) and driving to your town again to show off the latest and greatest in Visual Studio 2010 and .NET 4.0!  And to make the night even more fun, we’re going to bring a mystery rock star from the Visual Studio world to the event and interview them for a special .NET Rocks Road Trip show series. Along the way we’ll be giving away some great prizes, showing off some awesome technology and having a ton of laughs. And one lucky person at the event will win “Ride Along with Carl and Richard” and get to board the RV and ride with the boys to the next town on the tour (don’t worry, we’ll get you home again!) The details can be found here: http://www.dotnetrocks.com/roadtrip.aspx

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• 2d movement solution

  - by Phil

  Hi! I'm making a simple top-down tank game on the ipad where the user controls the movement of the tank with the left "joystick" and the rotation of the turret with the right one. I've spent several hours just trying to get it to work decently but now I turn to the pros :) I have two referencial objects, one for the movement and one for the rotation. The referencial objects always stay max two units away from the tank and I use them to tell the tank in what direction to move. I chose this approach to decouple movement and rotational behaviour from the raw input of the joysticks, I believe this will make it simpler to implement whatever behaviour I want for the tank. My problem is 1; the turret rotates the long way to the target. With this I mean that the target can be -5 degrees away in rotation and still it rotates 355 degrees instead of -5 degrees. I can't figure out why. The other problem is with the movement. It just doesn't feel right to have the tank turn while moving. I'd like to have a solution that would work as well for the AI as for the player. A blackbox function for the movement where the player only specifies in what direction it should move and it moves there under the constraints that are imposed on it. I am using the standard joystick class found in the Unity iPhone package. This is the code I'm using for the movement: public class TankFollow : MonoBehaviour { //Check angle difference and turn accordingly public GameObject followPoint; public float speed; public float turningSpeed; void Update() { transform.position = Vector3.Slerp(transform.position, followPoint.transform.position, speed * Time.deltaTime); //Calculate angle var forwardA = transform.forward; var forwardB = (followPoint.transform.position - transform.position); var angleA = Mathf.Atan2(forwardA.x, forwardA.z) * Mathf.Rad2Deg; var angleB = Mathf.Atan2(forwardB.x, forwardB.z) * Mathf.Rad2Deg; var angleDiff = Mathf.DeltaAngle(angleA, angleB); //print(angleDiff.ToString()); if (angleDiff > 5) { //Rotate to transform.Rotate(new Vector3(0, (-turningSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); } else if (angleDiff < 5) { transform.Rotate(new Vector3(0, (turningSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); } else { } transform.position = new Vector3(transform.position.x, 0, transform.position.z); } } And this is the code I'm using to rotate the turret: void LookAt() { var forwardA = -transform.right; var forwardB = (toLookAt.transform.position - transform.position); var angleA = Mathf.Atan2(forwardA.x, forwardA.z) * Mathf.Rad2Deg; var angleB = Mathf.Atan2(forwardB.x, forwardB.z) * Mathf.Rad2Deg; var angleDiff = Mathf.DeltaAngle(angleA, angleB); //print(angleDiff.ToString()); if (angleDiff - 180 > 1) { //Rotate to transform.Rotate(new Vector3(0, (turretSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); } else if (angleDiff - 180 < -1) { transform.Rotate(new Vector3(0, (-turretSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); print((angleDiff - 180).ToString()); } else { } } Since I want the turret reference point to turn in relation to the tank (when you rotate the body, the turret should follow and not stay locked on since it makes it impossible to control when you've got two thumbs to work with), I've made the TurretFollowPoint a child of the Turret object, which in turn is a child of the body. I'm thinking that I'm making it too difficult for myself with the reference points but I'm imagining that it's a good idea. Please be honest about this point. So I'll be grateful for any help I can get! I'm using Unity3d iPhone. Thanks!

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• The countdown for ‘In Touch’ has begun!

  - by Julien Haye

  The Oracle 'In Touch' PartnerCast is just a week away from going live, so if you haven’t registered yet, what are you waiting for?! Registration is quick and easy, so click here to register and ensure you stay informed with the latest from the Oracle PartnerNetwork.  'In Touch' relies on your input, so let David Callaghan, Senior Vice President EMEA Alliances and Channels, know your thoughts and comments via the player consol, by emailing [email protected] or on twitter using the hashtag #DCpickme. The cast will go live on Tuesday 29th October from 10:30am UK / 11:30am CET with studio guests Will O'Brien, VP Alliances & Channels, UK & Ireland, and Markus Reischl, Senior Director and Sales Leader EMEA Strategic Alliances, answering your questions on Oracle Storage and Business Intelligence. To find out more information about the cast, including the full line up, please visit the 'In Touch' webpage here.

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• HTG Explains: Why is Printer Ink So Expensive?

  - by Chris Hoffman

  Printer ink is expensive, more expensive per drop than fine champagne or even human blood. If you haven’t gone paperless, you’ll notice that you’re paying a lot for new ink cartridges — more than seems reasonable. Purchasing the cheapest inkjet printer and buying official ink cartridge replacements is the most expensive thing you can do. There are ways to save money on ink if you must continue to print documents. Cheap Printers, Expensive Ink Ink jet printers are often very cheap. That’s because they’re sold at cost, or even at a loss — the manufacturer either makes no profit from the printer itself or loses money. The manufacturer will make most of its money from the printer cartridges you buy later. Even if the company does make a bit of money from each printer sold, it makes a much larger profit margin on ink. Rather than selling you a printer that may be rather expensive, they want to sell you a cheap printer and make money on an ongoing basis by providing expensive printer ink. It’s been compared to the razor model — sell a razor cheaply and mark up the razor blades. Rather than making a one-time profit on the razor, you’ll make continuing profit as the customer keeps buying razor blade replacements — or ink, in this case. Many printer manufacturers go out of their way to make it difficult for you to use unofficial ink cartridges, building microchips into their official ink cartridges. If you use an unofficial cartridge or refill an official cartridge, the printer may refuse to use it. Lexmark once argued in court that unofficial microchips that enable third-party ink cartridges would violate their copyright and Lexmark has argued that creating an unofficial microchip to bypass this restriction on third-party ink would violate Lexmark’s copyright and be illegal under the US DMCA. Luckily, they lost this argument. What Printer Companies Say Printer companies have put forth their own arguments in the past, attempting to justify the high cost of official ink cartridges and microchips that block any competition. In a Computer World story from 2010, HP argued that they spend a billion dollars each year on “ink research and development.” They point out that printer ink “must be formulated to withstand heating to 300 degrees, vaporization, and being squirted at 30 miles per hour, at a rate of 36,000 drops per second, through a nozzle one third the size of a human hair. After all that it must dry almost instantly on the paper.” They also argue that printers have become more efficient and use less ink to print, while third-party cartridges are less reliable. Companies that use microchips in their ink cartridges argue that only the microchip has the ability to enforce an expiration date, preventing consumers from using old ink cartridges. There’s something to all these arguments, sure — but they don’t seem to justify the sky-high cost of printer ink or the restriction on using third-party or refilled cartridges. Saving Money on Printing Ultimately, the price of something is what people are willing to pay and printer companies have found that most consumers are willing to pay this much for ink cartridge replacements. Try not to fall for it: Don’t buy the cheapest inkjet printer. Consider your needs when buying a printer and do some research. You’ll save more money in the long run. Consider these basic tips to save money on printing: Buy Refilled Cartridges: Refilled cartridges from third parties are generally much cheaper. Printer companies warn us away from these, but they often work very well. Refill Your Own Cartridges: You can get do-it-yourself kits for refilling your own printer ink cartridges, but this can be messy. Your printer may refuse to accept a refilled cartridge if the cartridge contains a microchip. Switch to a Laser Printer: Laser printers use toner, not ink cartridges. If you print a lot of black and white documents, a laser printer can be cheaper. Buy XL Cartridges: If you are buying official printer ink cartridges, spend more money each time. The cheapest ink cartridges won’t contain much ink at all, while larger “XL” ink cartridges will contain much more ink for only a bit more money. It’s often cheaper to buy in bulk. Avoid Printers With Tri-Color Ink Cartridges: If you’re printing color documents, you’ll want to get a printer that uses separate ink cartridges for all its colors. For example, let’s say your printer has a “Color” cartridge that contains blue, green, and red ink. If you print a lot of blue documents and use up all your blue ink, the Color cartridge will refuse to function — now all you can do is throw away your cartridge and buy a new one, even if the green and red ink chambers are full. If you had a printer with separate color cartridges, you’d just have to replace the blue cartridge. If you’ll be buying official ink cartridges, be sure to compare the cost of cartridges when buying a printer. The cheapest printer may be more expensive in the long run. Of course, you’ll save the most money if you stop printing entirely and go paperless, keeping digital copies of your documents instead of paper ones. Image Credit: Cliva Darra on Flickr     

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• SCCM 2012 - some remote clients unable to download some applications, 401.2 error

  - by growse

  I've got a small SCCM 2012 deployment with about 35 clients attached. Most of these clients are in the same network as the single SCCM host, but three are about 1000 miles away. Oddly, these three clients have stopped being able to download some application packages over BITS. Publishing a new package works for all the other clients, but for these three it never seems to download. If I go to the software centre, it just hangs at "0% downloaded". On the client, the DataTransfer.log says (repeatedly): CDTSJob::HandleErrors: DTS Job '{2DCBBB4C-6D84-479A-9218-885B72C834B9}' BITS Job '{E78147DD-4A26-4942-B4FD-6EC3EB77EECD}' under user 'S-1-5-18' OldErrorCount 442 NewErrorCount 443 ErrorCode 0x80072EE2 DataTransferService 30/07/2012 09:27:41 2964 (0x0B94) CDTSJob::HandleErrors: DTS Job ID='{2DCBBB4C-6D84-479A-9218-885B72C834B9}' URL='http://sccm-host:80/SMS_DP_SMSPKG$/Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1' ProtType=1 DataTransferService 30/07/2012 09:27:41 2964 (0x0B94) Cas.log says (repeatedly): Location update from CTM for content Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1 and request {AD041FCB-03D2-4FE6-A6FA-38A6B80FB2A1} ContentAccess 30/07/2012 08:33:39 5048 (0x13B8) Download location found 0 - http://lonsbrndsccm02.mcs.int.thomsonreuters.com/SMS_DP_SMSPKG$/Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1 ContentAccess 30/07/2012 08:33:39 5048 (0x13B8) Download request only, ignoring location update ContentAccess 30/07/2012 08:33:39 5048 (0x13B8) On the server, I've enabled failed request log tracing. The raw IIS log says the following: 2012-07-30 08:28:42 10.13.111.35 GET /SMS_DP_SMSPKG$/Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1/sccm /NSCP-0.4.0.172-x64.msi 80 - 10.2.27.19 Microsoft+BITS/7.5 401 2 5 293 Which is a 401.2 error, meaning access denied. The failed request log is large, but the punchline is that it chucks out a Unauthorized: Access is denied due to invalid credentials. message. All clients are members of the same domain and appear to be (otherwise) working great. I've re-installed the SCCM client, deleted and re-added the computer to SCCM. Some other packages seem to work fine, the daily anti-malware delta gets downloaded and patched without issue. Why are these packages failing?

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• An Hour With Bill Buxton MIX10

  After spending a couple of hours with Rowan Simpson yesterday afternoon I found myself continually coming back to some of the things that Bill Buxton talked about in his hour Q&A at MIX10 in Las Vegas. Dont have Silverlight? Download the video in WMV, WMV (High) or MP4 format. At the more theoretical level, Bill discusses technology as a human prosthesis, but he favours metaphors that are as far away from technology as possible. The Seattle Public Library and software building....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Got an idea for an application, but part of it is patented, any suggestions?

  - by tekiegreg

  Hi there, so I've been working on developing an idea for an application that I think has the potential to be successful, however after some initial research I've discovered that at least part of my ideas are covered by a patent out there, the patent in particular is held by a really large company (I don't want to give away specifics for fear I'd draw their attention for sure). I'm debating a few options: 1) Develop patents around my ideas that don't conflict and maybe approach the company in question for a license exchange 2) Just approach them for a license outright 3) Just develop around it anyways and hope for the best :-p What have other people done in these situations? Are companies generally willing to grant patent licenses? Are they willing to grant them at reasonable prices? Thoughts?

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• The curious case(s) of the Microsoft product naming department

  - by AaronBertrand

  A long time ago, in a galaxy far, far away... Okay, it was here on earth, a little over 5 years ago. With SQL Server 2005, Microsoft introduced a very useful feature called the DAC. DAC stands for "dedicated administrator connection"... you can read about it here , but essentially, it allows you a single connection into the server with priority resource allocation - so you can actually get in and kill a rogue process that is otherwise taking over the server. On its own this was a fine acronym choice,...(read more)

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• How to reenable Documents on iPhone?

  - by Matt

  So, I regularly plug in my iPhone to my computer to get voice recordings off of it. However, every time I plugged it in "iPhone" and "Documents on iPhone" would both mount, and "Documents on iPhone" would pop up automatically. As I normally don't need anything on there it was a bit of a nuisance, so I opened a terminal and ran: sudo apt-get install libimobiledevice-utils;idevicepair unpair && idevicepair pair as suggested a here This, however, took away my access to "Documents on iPhone" completely, and didn't provide an alternative like putting it in a folder on the main "iPhone" device. Now I actually NEED to get something off there. Is there anyway to get "Documents on iPhone" back? I would prefer it still didn't pop up automatically but that's a sacrifice I'm willing to make. UPDATE: I ran idevicepair pair and unplugged and replugged my phone. I now have Documents back but it still annoyingly opens every time I plug in.

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• Realtek HD Audio Driver for Ubuntu 12.04?

  - by Shifat Taushif

  I recently switched to Ubuntu 12.04 on my Toshiba laptop. I haven't had any issues except for one. I realized that there is a red light coming out of my earphone jack. It's something like this: http://i.stack.imgur.com/gokuH.jpg I looked in the folder that Toshiba created for installing drivers , then I found out that they had installed this driver for my sound card : Realtek HD Audio Driver v6.0.1.5689_withMaxxAudio_Compal(20080908) I'm guessing that the sound card supports Optical Audio Output. I also found out that when I mute the speakers, the light goes away. But when I unmute it, it comes back. I don't really mind having it but it drains my battery. So, is there a Ubuntu version for my sound card driver? Thanks in advance.

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• Discount for Staying in Town During St. Louis Day of .NET 2011

  - by Scott Spradlin

  Traveling in from out of town? (Or just interested in a night away from home with your spouse in a beautiful suite?) You can call the Ameristar at 636-940-4301 and ask for the St. Louis Day of .NET 2011 group rate. You can also make reservations online using the conference code GDNET11. We encourage you take the opportunity to hang around, spend the night, and enjoy the social events and networking opportunities that we have planned. Friday and Saturday sessions start promptly in the mornings. There are great social events planned for both Thursday and Friday nights that you’ll enjoy if you stay on-site!

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• Upcoming Speaking Engagements

  This is a short notice, but still… I'm giving my IoC and DI with WebForms presentation at the New York Code Camp tomorrow. Instead of walking away with a "this is only a demo; don't try it at home" excuse, I actually have a read-world example to go through. There exists an entrenched belief that there's only one way to develop with WebForms, i.e. rely on the crunch of view state, postbacks, session, etc. I beg to differ. You can write cleaner, cohesive, more testable...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• BIP Enterprise Patches

  - by Tim Dexter

  Got some input from the support team yesterday BIP patching. I dont have any control over the patches but have a voice to get information out there. Just to clarify for you all, the recent 'rollup' patch, 9546699 that I blogged a while back supersedes all other patches for the standalone release. If you have an issue and log an SR, please ensure you have applied 9546699 and re-checked the issue. There are so many fixes and enhancements in that patch that your issue may be fixed or addressed. If you are a new customer and download the latest release, 10.1.3.4.1 from oracle.com. Please get onto the support site and get 9546699 applied straight away. For more information check out Pieter's Note on BIP patching - 797057.1

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• Richmond Code Camp 2010.1

  - by andyleonard

  I can't believe it - Richmond Code Camp 2010.1 is less than two weeks away! Once again, the leadership team has outdone themselves. We have a bunch of great speakers, 9 tracks, 45 sessions - there's something for everyone. If you're going to be in the area and are interested, register today. :{> Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!...(read more)

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• How could Google Latitude find my exact PC location with no GPS or public wifi?

  - by Mike

  I found a similar question here but I still don't get it. You see, I live in a small town and every time I check my IP location via online services or speed test websites, my location appears to be my ISP server location (which in my case is 250 miles away). But when I tried Google latitude, it pinpointed my exact location within less than 100 meters! I use Windows Vista, Google Chrome, and when I got the message that "Google is trying to locate you", I agreed just to check what the result will be. It was scary, very scary! What I've come up after reading the above link is that Google have a kind of extensive WiFi database locations. That could be understandable with the case of public and open WiFis that are used with a lot of people. Some of them might be using applications that could gather location data and somehow this information ends up in giant Google databases. From those, Google could pinpoint a WiFi location based on its MAC address along with these bits of info that have been gathered via various sources. The issue here is that my WiFi is private, I don't even broadcast my WiFi name. So how on earth did Google find my exact PC location? Please break down the answer in layman's terms as possible.

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• Screen magnifier wrecks login screen — how to get rid of it?

  - by Jonik

  In the Ubuntu / GNOME login screen, I tried some of the different accessibility settings out of curiosity. Big mistake! Enabling the "use screen magnifier" (or whatever) option breaks down the view horribly, and makes it impossible to even access the settings again: (Right click & View Image for full size) Yes, I tried to access every corner of the screen using the mouse, but there's just chaos everywhere. Fortunately, I can still log in (pressing "Esc" makes the normal login dialog appear on the left-hand monitor). My question is, how to disable the "magnifier" option outside of the login screen itself? (By editing some config file perhaps?) I don't care about getting the magnifier mode to work properly - just make it go away altogether, please.

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• Replication - between pools in the same system

  - by Steve Tunstall

  OK, I fully understand that's it's been a LONG time since I've blogged with any tips or tricks on the ZFSSA, and I'm way behind. Hey, I just wrote TWO BLOGS ON THE SAME DAY!!! Make sure you keep scrolling down to see the next one too, or you may have missed it. To celebrate, for the one or two of you out there who are still reading this, I got something for you. The first TWO people who make any comment below, with your real name and email so I can contact you, will get some cool Oracle SWAG that I have to give away. Don't get excited, it's not an iPad, but it pretty good stuff. Only the first two, so if you already see two below, then settle down. Now, let's talk about Replication and Migration.  I have talked before about Shadow Migration here: https://blogs.oracle.com/7000tips/entry/shadow_migrationShadow Migration lets one take a NFS or CIFS share in one pool on a system and migrate that data over to another pool in the same system. That's handy, but right now it's only for file systems like NFS and CIFS. It will not work for LUNs. LUN shadow migration is a roadmap item, however. So.... What if you have a ZFSSA cluster with multiple pools, and you have a LUN in one pool but later you decide it's best if it was in the other pool? No problem. Replication to the rescue. What's that? Replication is only for replicating data between two different systems? Who told you that? We've been able to replicate to the same system now for a few code updates back. These instructions below will also work just fine if you're setting up replication between two different systems. After replication is complete, you can easily break replication, change the new LUN into a primary LUN and then delete the source LUN. Bam. Step 1- setup a target system. In our case, the target system is ourself, but you still have to set it up like it's far away. Go to Configuration-->Services-->Remote Replication. Click the plus sign and setup the target, which is the ZFSSA you're on now. Step 2. Now you can go to the LUN you want to replicate. Take note which Pool and Project you're in. In my case, I have a LUN in Pool2 called LUNp2 that I wish to replicate to Pool1.  Step 3. In my case, I made a Project called "Luns" and it has LUNp2 inside of it. I am going to replicate the Project, which will automatically replicate all of the LUNs and/or Filesystems inside of it.  Now, you can also replicate from the Share level instead of the Project. That will only replicate the share, and not all the other shares of a project. If someone tells you that if you replicate a share, it always replicates all the other shares also in that Project, don't listen to them.Note below how I can choose not only the Target (which is myself), but I can also choose which Pool to replicate it to. So I choose Pool1.  Step 4. I did not choose a schedule or pick the "Continuous" button, which means my replication will be manual only. I can now push the Manual Replicate button on my Actions list and you will see it start. You will see both a barber pole animation and also an update in the status bar on the top of the screen that a replication event has begun. This also goes into the event log.  Step 5. The status bar will also log an event when it's done. Step 6. If you go back to Configuration-->Services-->Remote Replication, you will see your event. Step 7. Done. To see your new replica, go to the other Pool (Pool1 for me), and click the "Replica" area below the words "Filesystems | LUNs" Here, you will see any replicas that have come in from any of your sources. It's a simple matter from here to break the replication, which will change this to a "Local" LUN, and then delete the original LUN back in Pool2. Ok, that's all for now, but I promise to give out more tricks sometime in November !!! There's very exciting stuff coming down the pipe for the ZFSSA. Both new hardware and new software features that I'm just drooling over. That's all I can say, but contact your local sales SC to get a NDA roadmap talk if you want to hear more.   Happy Halloween,Steve 

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• Where to find clients?

  - by Zenph

  Of course, I don't expect anybody give away their 'gold mine' or whatever but I am struggling to see where I should be advertising my services. I have one other developer I work with and we have a lot of happy clients - on freelance websites. Thing is, freelance websites just seem to suck the life out of you when you're being out-bidded by ridiculous rates. I want to attract customers who are more concerned about quality and accountability than price. Any suggestions at all? I'm so lost with this.

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• how important is usability to your workplace/employer?

  - by Dana

  If asked, I would bet that every manager would agree that software usability is important. Unfortunately, when it comes time to put their money where there mouths are, they shy away and tell the programmer to just make it usable. What is everyone's experience with usability in the workplace? Is there a usability team? How many people have usability as their primary job role? What is the ratio of usability experts to programmers? Is the usability team taken seriously? If there is no usability team, what does your company do to address usability of software? Does it work?

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• The final Cumulative Update for SQL Server 2008 SP3

  - by AaronBertrand

  Microsoft has released the final Cumulative Update (#17) for SQL Server 2008 Service Pack 3. Build # 10.00.5861 KB Article: KB #2958696 9 public fixes Relevant for builds 10.00.5500 -> 10.00.5860 NOT for SQL Server 2008 R2 (10.50.xxxx) Once more, this is the last cumulative update for SQL Server 2008. Both 2008 and 2008 R2 exit mainstream support in July of this year. That's two months away. If you want a final service pack for either or both of these major versions, and want your voice heard,...(read more)

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• Going into Web Development without a C.S. Degree - Suggestions

  - by Klaint Cokeman

  I plan on seeking a career in web development and I'm about two semesters away from graduating with a CIS degree. Although I'm very satisfied with my choice of degree, I'm concerned that I may be lacking knowledge in a few areas because of not majoring in computer science. The programming side of things is no problem for me, I'm just wondering to what extent data structures/theory/etc. might benefit me to learn over spending more time with hands-on programming... and also what aspects of C.S. would be most appropriate to look into you would think would be most applicable to web development. In short, I'd like to expand my horizons a little bit. I'd very much appreciate and advice/suggestions/book or tutorial recommendations, etc. Thanks.

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• When should I use—and not use—design patterns?

  - by ashmish2

  In a previous question of mine on Stack Overflow, FredOverflow mentioned in the comments: Note that patterns do not magically improve the quality of your code. and Any measure of quality you can imagine. Patterns are not a panacea. I once wrote a Tetris game with about 100 classes that incorporated all the patterns I knew at the time. Why use a simple if/else if you can use a pattern? OO is good, and patterns are even better, right? No, it was a terrible, over-engineered piece of crap. I am quite confused by these comments: I know design patterns help to make code reusable and readable, but when should I use use design patterns and perhaps more importantly, when should I avoid getting carried away with them?

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• 2d tank movement and turret solution

  - by Phil

  Hi! I'm making a simple top-down tank game on the ipad where the user controls the movement of the tank with the left "joystick" and the rotation of the turret with the right one. I've spent several hours just trying to get it to work decently but now I turn to the pros :) I have two referencial objects, one for the movement and one for the rotation. The referencial objects always stay max two units away from the tank and I use them to tell the tank in what direction to move. I chose this approach to decouple movement and rotational behaviour from the raw input of the joysticks, I believe this will make it simpler to implement whatever behaviour I want for the tank. My problem is 1; the turret rotates the long way to the target. With this I mean that the target can be -5 degrees away in rotation and still it rotates 355 degrees instead of -5 degrees. I can't figure out why. The other problem is with the movement. It just doesn't feel right to have the tank turn while moving. I'd like to have a solution that would work as well for the AI as for the player. A blackbox function for the movement where the player only specifies in what direction it should move and it moves there under the constraints that are imposed on it. I am using the standard joystick class found in the Unity iPhone package. This is the code I'm using for the movement: public class TankFollow : MonoBehaviour { //Check angle difference and turn accordingly public GameObject followPoint; public float speed; public float turningSpeed; void Update() { transform.position = Vector3.Slerp(transform.position, followPoint.transform.position, speed * Time.deltaTime); //Calculate angle var forwardA = transform.forward; var forwardB = (followPoint.transform.position - transform.position); var angleA = Mathf.Atan2(forwardA.x, forwardA.z) * Mathf.Rad2Deg; var angleB = Mathf.Atan2(forwardB.x, forwardB.z) * Mathf.Rad2Deg; var angleDiff = Mathf.DeltaAngle(angleA, angleB); //print(angleDiff.ToString()); if (angleDiff > 5) { //Rotate to transform.Rotate(new Vector3(0, (-turningSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); } else if (angleDiff < 5) { transform.Rotate(new Vector3(0, (turningSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); } else { } transform.position = new Vector3(transform.position.x, 0, transform.position.z); } } And this is the code I'm using to rotate the turret: void LookAt() { var forwardA = -transform.right; var forwardB = (toLookAt.transform.position - transform.position); var angleA = Mathf.Atan2(forwardA.x, forwardA.z) * Mathf.Rad2Deg; var angleB = Mathf.Atan2(forwardB.x, forwardB.z) * Mathf.Rad2Deg; var angleDiff = Mathf.DeltaAngle(angleA, angleB); //print(angleDiff.ToString()); if (angleDiff - 180 > 1) { //Rotate to transform.Rotate(new Vector3(0, (turretSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); } else if (angleDiff - 180 < -1) { transform.Rotate(new Vector3(0, (-turretSpeed * Time.deltaTime),0)); //transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y + adjustment, transform.rotation.z, transform.rotation.w); print((angleDiff - 180).ToString()); } else { } } Since I want the turret reference point to turn in relation to the tank (when you rotate the body, the turret should follow and not stay locked on since it makes it impossible to control when you've got two thumbs to work with), I've made the TurretFollowPoint a child of the Turret object, which in turn is a child of the body. I'm thinking that I'm making it too difficult for myself with the reference points but I'm imagining that it's a good idea. Please be honest about this point. So I'll be grateful for any help I can get! I'm using Unity3d iPhone. Thanks!

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