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  • Why can't Ubuntu find an ext3 filesystem on my hard-drive?

    - by urig
    This question is related to this question: Not enough components to start the RAID array? I'm trying to retrieve data from a "Western Digital MyBook World Edition (white light)" NAS device. This is basically an embedded Linux box with a 1TB HDD in it formatted in ext3. It stopped booting one day for no apparent reason. I have extracted the HDD from the NAS device and installed it in a desktop machine running Ubuntu 10.10 in the hope of accessing the files on the drive. I have followed instructions in this forum post, intended to mount the drive through Terminal: http://mybookworld.wikidot.com/forum/t-90514/how-to-recover-data-from-wd-my-book-world-edition-nas-device#post-976452 I have identified the partition that I want to mount and recover files from as /dev/sd4 by running "fdisk -l" and getting this: Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0001cf00 Device Boot Start End Blocks Id System /dev/sdb1 5 248 1959930 fd Linux raid autodetect /dev/sdb2 249 280 257040 fd Linux raid autodetect /dev/sdb3 281 403 987997+ fd Linux raid autodetect /dev/sdb4 404 121601 973522935 fd Linux raid autodetect// When I try to mount using: "mount -t ext3 /dev/sdb4 /media/xyz" I get the following error: mount: wrong fs type, bad option, bad superblock on /dev/sdb4, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so And "dmesg | tail" shows me: [ 15.184757] [drm] Initialized nouveau 0.0.16 20090420 for 0000:01:00.0 on minor 0 [ 15.986859] [drm] nouveau 0000:01:00.0: Allocating FIFO number 1 [ 15.988379] [drm] nouveau 0000:01:00.0: nouveau_channel_alloc: initialised FIFO 1 [ 16.353379] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro,commit=0 [ 16.705944] tg3 0000:02:00.0: eth0: Link is up at 100 Mbps, full duplex [ 16.705951] tg3 0000:02:00.0: eth0: Flow control is off for TX and off for RX [ 16.706102] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 19.125673] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro,commit=0 [ 27.600012] eth0: no IPv6 routers present [ 373.478031] EXT3-fs (sdb4): error: can't find ext3 filesystem on dev sdb4. I guess that last line is the punch line :) Why can't it find the ext3 filesystem on my drive? What do I need to do to mount this partition and copy its contents? Does it have anything to do with the drive being part of a RAID Array (see question mentioned above)? Many thanks to any who can help.

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  • Parameterize Charts using Excel Slicers in PowerPivot

    - by Marco Russo (SQLBI)
    One new nice feature of Excel 2010 is the Slicer. Usually, slicers are used to filter data in a PivotTable. But they might be also useful to parameterize an algorithm or a chart! We discussed this technique in our book , but Alberto Ferrari wrote a post that shows how to use this technique to allow the user to select two stocks that should be compared in an Excel Chart – as you might imagine, this will work also when you will publish the workbook on SharePoint! This is the result: Nice to see that...(read more)

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  • Need to find a find a fast/multi-user database program

    - by user65961
    Our company is currently utilizing Excel and have been encountering a series of issues for starters we have multiple users sharing this application. We utilize it write our schedules for our employees and generate staffing levels. May someone give me please or inform me what are the pros and cons of this program and offer suggestions for another database that allows multiple users to share and also give the pros and cons need something that will hold massive data and allow sharing, protecting capabilities.

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  • TLS/SSL and .NET Framework 4.0

    The Secure Socket Layer is now essential for the secure exchange of digital data, and is most generally used within the HTTPS protocol. .NET now provides the Windows Communication Foundation (WCF) to implement secure communications directly. Matteo explains the TLS/SSL protocol, and takes a hands-on approach to investigate the SslStream class to show how to implement a secure communication channel

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  • Where should Acceptance tests be written against?

    - by Jonn
    I'm starting to get into writing automated Acceptance tests and I'm quite confused where to write these tests against, specifically what layer in the app. Most examples I've seen are Acceptance tests written against the Domain but how about tests like: Given Incorrect Data When the user submits the form Then Play an Error Beep These seem to be fit for the UI and not for the Domain, or probably even the Service layer.

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  • Search Engine Optimization And Other Web Services

    The SEO (Search Engine Optimization) involves an On-Page Optimization through which the different actions being done on the site so as to make the data and content presentable and relevant with a tidy and appealing display for the readers who frequently visit it to gain info on their part of interest and also for the Search Engines wanderers who want to register them. The search engine marketing Company, SEO Services renders a good quality Search Engine Optimization, also Social media optimization and many different types of marketing Solutions for the web business.

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  • Facebook C# SDK submitted to the Outercurve Foundation

    - by The Official Microsoft IIS Site
    I am pleased to announce another open source milestone as we continue to deliver on our commitment to Interoperability: today, the Facebook C# SDK was submitted to the Outercurve Foundation’s Data, Languages, and Systems Interoperability gallery. This project is a set of libraries that enables developers of all Microsoft platforms, as well as Mono, to build applications that integrate with Facebook. The project contains core libraries for authentication and calling Facebook APIs. Additionally...(read more)

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  • IBM Reinvents x86 Platform with eX5 Servers

    The amount of data involved in the average Web-based workload today doubles every year, increasing costs and straining IT resources. The traditional response to this dilemma from IT organizations is to throw more servers at the problem, which furthers server sprawl and increases power and management costs. As a result, the typical x86 server is only running at 10 percent utilization.

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  • Simple HTML5 Friendly Markup Sample

    - by Geertjan
    From a demo done by David Heffelfinger (who has a great Java EE 7 screencast series here), on HTML5 friendly markup. index.xhtml:  <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:jsf="http://xmlns.jcp.org/jsf"> <title>Data Entry Page</title> <body> <form method="POST" jsf:id='form'> <table> <tr> <td>Name:</td> <td><input jsf:id='name' type="text" jsf:value="${person.name}" /></td> </tr> <tr> <td>City</td> <th><input jsf:id='city' type="text" jsf:value="${person.city}"/></th> </tr> <tr> <td><input type="submit" value="Submit" jsf:action="confirmation" /></td> </tr> </table> </form> </body> </html> confirmation.xhtml: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Data Confirmation Page</title> </head> <body> <h1>#{person.name}</h1> from <h2>#{person.city}</h2> </body> </html> Person.java: package org.demo; import javax.enterprise.inject.Model; @Model public class Person { String name; String city; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } }

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  • The IT Security Bubble Has Popped

    The blank check IT security enjoyed has been pulled off the table as businesses reassess how much they spend to stay safe. Need some data on the mood? McAfee reports nearly three-quarters of SMBs have cut security spending, even though 71 percent believe a serious attack would put them out of business.

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  • IBM Reinvents x86 Platform with eX5 Servers

    The amount of data involved in the average Web-based workload today doubles every year, increasing costs and straining IT resources. The traditional response to this dilemma from IT organizations is to throw more servers at the problem, which furthers server sprawl and increases power and management costs. As a result, the typical x86 server is only running at 10 percent utilization.

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  • Identifying which pattern fits better.

    - by Daniel Grillo
    I'm developing a software to program a device. I have some commands like Reset, Read_Version, Read_memory, Write_memory, Erase_memory. Reset and Read_Version are fixed. They don't need parameters. Read_memory and Erase_memory need the same parameters that are Length and Address. Write_memory needs Lenght, Address and Data. For each command, I have the same steps in sequence, that are something like this sendCommand, waitForResponse, treatResponse. I'm having difficulty to identify which pattern should I use. Factory, Template Method, Strategy or other pattern. Edit I'll try to explain better taking in count the given comments and answers. I've already done this software and now I'm trying to refactoring it. I'm trying to use patterns, even if it is not necessary because I'm taking advantage of this little software to learn about some patterns. Despite I think that one (or more) pattern fits here and it could improve my code. When I want to read version of the software of my device, I don't have to assembly the command with parameters. It is fixed. So I have to send it. After wait for response. If there is a response, treat (or parse) it and returns. To read a portion of the memory (maximum of 256 bytes), I have to assembly the command using the parameters Len and Address. So I have to send it. After wait for response. If there is a response, treat (or parse) it and returns. To write a portion in the memory (maximum of 256 bytes), I have to assembly the command using the parameters Len, Address and Data. So I have to send it. After wait for response. If there is a response, treat (or parse) it and returns. I think that I could use Template Method because I have almost the same algorithm for all. But the problem is some commands are fixes, others have 2 or 3 parameters. I think that parameters should be passed on the constructor of the class. But each class will have a constructor overriding the abstract class constructor. Is this a problem for the template method? Should I use other pattern?

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  • NTFS volume recognised as "Unallocated Space" but works with Windows

    - by msaspence
    Moving to Ubuntu, I have a drive with windows on a drive with Ubuntu on and 4 other ntfs drives 3 of which appear fine in both systems 1 however works fine on windows (single ntfs volume) but in ubuntu the drive appears in the disk utility with a 134 MB "Microsoft Reserved Partition" and 2TB of Unallocated Space Is there any way I can get this volume to be mounted in Ubuntu with out moving all my data to another driver formatting and then moving back again

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  • Code Design question, circular reference across classes?

    - by dsollen
    I have no code here, as this is more of a design question (I assume this is still the best place to ask it). I have a very simple server in java which stores a mapping between certain values and UUID which are to be used by many systems across multiple platforms. It accepts a connection from a client and creates a clientSocket which stores the socket and all the other relevant data unique to that connection. Each clientSocket will run in their own thread and will block on the socket waiting for a read. I expect very little strain on this system, it will rarely get called, but when it does get a call it will need to respond quickly and due to the risk of it having a peak time with multiple calls coming in at once threaded is still better. Each thread has a reference to a Mapper class which stores the mapping of UUID which it's reporting to others (with proper synchronization of course). This all works until I have to add a new UUID to the list. When this happens I want to report to all clients that care about that particular UUID that a new one was added. I can't multicast (limitation of the system I'm running on) so I'm having each socket send the message to the client through the established socket. However, since each thread only knows about the socket it's waiting on I didn't have a clear method of looking up every thread/socket that cares about the data to inform them of the new UUID. Polling is out mostly because it seems a little too convoluted to try to maintain a list of newly added UUID. My solution as of now is to have the 'parent' class which creates the mapper class and spawns all the threads pass itself as an argument to the mapper. Then when the mapper creates a new UUID it can make a call to the parent class telling it to send out updates to all the other sockets that care about the change. I'm concerned that this may be a bad design due to the use of a circular reference; parent has a reference to mapper (to pass it to new ClientSocket threads) and mapper points to parent. It doesn't really feel like a bad design to me but I wanted to check since circular references are suppose to be bad. Note: I realize this means that the thread associated with whatever socket originally received the request that spawned the creation of a UUID is going to pay the 'cost' of outputting to all the other clients that care about the new UUID. I don't care about this; as I said I suspect the client to receive only intermittent messages. It's unlikely for one socket to receive multiple messages at one time, and there won't be that many sockets so it shouldn't take too long to send messages to each of them. Perhaps later I'll fix the fact that I'm saddling higher work load on whatever unfortunate thread gets the first request; but for now I think it's fine.

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  • Sync calendar and contacts with Android smartphone

    - by takeshin
    I use Thunderbird with Lighting calendar addon, which stores calendar data in iCalendar format. How can I synchronize this calendar and Thunderbird contacts with Android based smartphone (HTC Wildfire). I know I can use Google Account, but I'd prefer to use bluetooth or even better, local access via wi-fi (no internet connection available). Is there any complete Ubuntu smartphone synchronization guide somewhere?

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  • 3 Important Questions to Ask Google Analytics

    With dozens of free web analytics tools available in the market, Google Analytics stands out because it provides data like no other tool does. Just add a few lines of JavaScript code to your website';... [Author: Debbie Everson - Web Design and Development - April 02, 2010]

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  • Part 5: Choose the right tool - or - why

    - by volker.eckardt(at)oracle.com
    Consider the following client request “Please create a report for us to list expenses”. Which Oracle EBS tool would you choose? There are plenty of options available: Oracle Reports, or BI Publisher with PDF or Excel layout, or Discoverer, or BI Publisher Stand Alone, or PDF online generation, or Oracle WebADI, or Plain SQL*Plus as Concurrent Program, or Online review option … Assuming, you as development lead have to decide, you may decide by available skill set in your development team. However, is this a good decision? An important question to influence the decision is the “Why” question: why do you need this report, what process is behind, what exactly you like to achieve? We see often data created or printed, although it would be much better to get the data in Excel, and upload changes via WebADI directly. There are more points that should drive your decision: How many of such requirements you have got? Has this technique been used in the project already? Are there related reusable’s you may gain from? How difficult is it to maintain your solution? Can you merge this report with another one, to reduce test and maintenance work? In addition, also your own development standards should guide you a bit to come to a good decision. In one of my own projects, we discussed such topics in our weekly team meeting. By utilizing the team knowledge best, you may come to a better decision, and additionally, your team supports your decision. Unfortunately, I have rarely seen dedicated team trainings or planned knowledge transfer to support such processes. Often the pressure to deliver on time is too high to have discussion and decision time left. But exactly this can help keeping maintenance costs low by limiting the number of alternative solutions for similar requirements. Lastly, design decisions should be documented to allow another person taking this over easily. Decisions shall be reviewed and updated regularly, to reflect related procedures or Oracle products respective product versions. Summary: Oracle EBS offers plenty of alternatives to implement customizations. Create and maintain a decision tree to support the design process. Do not leave the decision just on developer side. Limit the number of alternative solutions as best as possible; choose one which is the most appropriate also from future maintenance perspective.

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  • Any reason not to buy SSL certificates from a reseller?

    - by andrewtweber
    Is there any reason to buy an SSL certificate directly from the host (for $49, for example), instead of through a well-known reseller, for only $10.95? Specifically in my case, I just need to encrypt user data as they fill out forms. Nothing too critical, only usernames and passwords. I don't think my users actually care about the brand name or "trust" level behind the certificate, I'm just looking out for them.

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  • Upcoming Technical Training by PTS

    - by Javier Puerta
    Oracle Big Data Workshop June 24-26, 2014: Paris, France July 09-11, 2014: Paris, France Upgrade Your Solution to Oracle Database 12c Workshop June 17-18, 2014: Lisbon, Portugal July 29-30, 2014: Milan, Italy Oracle 12c Multitenant Technical Workshop July 23-24, 2014: Istanbul, Turkey September 2-3, 2014: Ankara, Turkey Oracle Exadata X4 workshop June 4-5, 2014: Madrid, Spain If registration link is not available, please contact the OPN Enablement manager at your local Oracle office.

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  • How to get around the Circular Reference issue with JSON and Entity

    - by DanScan
    I have been experimenting with creating a website that leverages MVC with JSON for my presentation layer and Entity framework for data model/database. My Issue comes into play with serializing my Model objects into JSON. I am using the code first method to create my database. When doing the code first method a one to many relationship (parent/child) requires the child to have a reference back to the parent. (Example code my be a typo but you get the picture) class parent { public List<child> Children{get;set;} public int Id{get;set;} } class child { public int ParentId{get;set;} [ForeignKey("ParentId")] public parent MyParent{get;set;} public string name{get;set;} } When returning a "parent" object via a JsonResult a circular reference error is thrown because "child" has a property of class parent. I have tried the ScriptIgnore attribute but I lose the ability to look at the child objects. I will need to display information in a parent child view at some point. I have tried to make base classes for both parent and child that do not have a circular reference. Unfortunately when I attempt to send the baseParent and baseChild these are read by the JSON Parser as their derived classes (I am pretty sure this concept is escaping me). Base.baseParent basep = (Base.baseParent)parent; return Json(basep, JsonRequestBehavior.AllowGet); The one solution I have come up with is to create "View" Models. I create simple versions of the database models that do not include the reference to the parent class. These view models each have method to return the Database Version and a constructor that takes the database model as a parameter (viewmodel.name = databasemodel.name). This method seems forced although it works. NOTE:I am posting here because I think this is more discussion worthy. I could leverage a different design pattern to over come this issue or it could be as simple as using a different attribute on my model. In my searching I have not seen a good method to overcome this problem. My end goal would be to have a nice MVC application that heavily leverages JSON for communicating with the server and displaying data. While maintaining a consistant model across layers (or as best as I can come up with).

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  • How can I Fix the CD/DVD refresh for the media drive so that Ubuntu 10.10 recognize it automatically?

    - by Denja
    Hello Community, I have recently installed Ubuntu 10.10 and it seems to work flawlessly. But today I tried to check some CDs and I was surprised that Ubuntu doesn't automatically refresh the CD/DVDs inserted in my media drive. I had to eject manually the CD/DVD from Ubuntu and then Insert the new CD and only then Ubuntu reads the data in the newly inserted CD/DVD. How can I fix the CD/DVD refresh for the media drive so that Ubuntu 10.10 recognize it automatically?

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