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  • Designing a software based load balancer

    - by Kishore pandey
    Hello to all Server fault users, I am new to this website but have constantly been using the mother website, stackover flow. Well to begin with, i would like to design a load balancer for the organization i am working for. As i am very new to this whole, idea about load balancing and networks. I am finding it very difficult to start my project. I did a lot of research on already existing load balancer and found some(HAPROXY,NGINX) that could solve my problems, but the point is, I am still in a dilemma if they could answer the following requirements of mine: The client and server in my architecture are distributed. The load balancer should take care of the firewall. LB server should balance the load among all servers present in WWW cloud. The LB server should have some sort of configuration file, with the help of which it is possible to configure the servers. Heart beat: With the help of which it would be possible to check if any server is down, if any server is down the request should be passed to some other server. Various load balancing algorithms of the incoming requests. Easy error handling. It should be fairly possible to prioritize the incoming requests. Is there any already available load balncer solution on the market that could satisfy these requirements? If not is there any base code available with the help of which i could develop my own load balncer. If not where should i start from scratch? I am practically new to everything. Any help from a load balancer expert is very much appreciated. Thanx a ton in advance. Cheers and regards. Kishore

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  • Text expansion software for Windows

    - by MagicAndi
    I am interested in using a text expansion application, such as Texter or Phase Express. Does anyone have any recommendations for the best text expansion application to use? I work on a number of Windows PCs (XP, Vista, Windows Server 2003 and Windows Server 2008); the application would need to work on all of these OS flavours. I am particularly interested in an application that is available for all of my programs, and that isn't program specific.

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  • Software to cache a web application for use offline

    - by littlecharva
    My boss quite regularly has to demo our web application to clients in a situation with no wifi available and sketchy 3G access, quite often the 3G lets him down. I have considered setting a copy of our server up in a virtual machine on his laptop so he could demo it offline, but I fear this will just introduce more headaches when he forgets how to boot the VM up. What I'd ideally like is an app that records you logging into a web app, saves copies of all the pages and ties the links and buttons you click up to offline copies of the pages it saves. So you could run through the demonstration you're going to give and have it cache the pages. When you then click the same buttons and links in offline mode it will present the relevant offline pages. Does such a thing exist? Can anyone recommend any alternative solutions to this problem? Thanks, Anthony

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  • Software to report internet traffic for home user

    - by Mehper C. Palavuzlar
    I need a freeware to monitor my internet activity, especially upload and download amounts over time. For instance, I like to see a graph or table that shows the downloaded and uploaded amounts per day, week or month and in total for a selected period. OS: Windows XP, Vista, 7 Edit: I don't need to see the traffic program by program. I'm not interested in which program accesses the internet, but I'm interested in monitoring my incoming and outgoing data amounts using a light-weight freeware.

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  • Removing a device in "removed" state from Linux software RAID array

    - by Sahasranaman MS
    My workstation has two disks(/dev/sd[ab]), both with similar partitioning. /dev/sdb failed, and cat /proc/mdstat stopped showing the second sdb partition. I ran mdadm --fail and mdadm --remove for all partitions from the failed disk on the arrays that use them, although all such commands failed with mdadm: set device faulty failed for /dev/sdb2: No such device mdadm: hot remove failed for /dev/sdb2: No such device or address Then I hot swapped the failed disk, partitioned the new disk and added the partitions to the respective arrays. All arrays got rebuilt properly except one, because in /dev/md2, the failed disk doesn't seem to have been removed from the array properly. Because of this, the new partition keeps getting added as a spare to the partition, and its status remains degraded. Here's what mdadm --detail /dev/md2 shows: [root@ldmohanr ~]# mdadm --detail /dev/md2 /dev/md2: Version : 1.1 Creation Time : Tue Dec 27 22:55:14 2011 Raid Level : raid1 Array Size : 52427708 (50.00 GiB 53.69 GB) Used Dev Size : 52427708 (50.00 GiB 53.69 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Fri Nov 23 14:59:56 2012 State : active, degraded Active Devices : 1 Working Devices : 2 Failed Devices : 0 Spare Devices : 1 Name : ldmohanr.net:2 (local to host ldmohanr.net) UUID : 4483f95d:e485207a:b43c9af2:c37c6df1 Events : 5912611 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 0 0 1 removed 2 8 18 - spare /dev/sdb2 To remove a disk, mdadm needs a device filename, which was /dev/sdb2 originally, but that no longer refers to device number 1. I need help with removing device number 1 with 'removed' status and making /dev/sdb2 active.

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  • Software to hold battery at 50% charge level

    - by Mehper C. Palavuzlar
    My Sony Vaio laptop has a built-in program called "Sony Battery Care" which provides a functionality to hold battery at certain levels of charge while operating. For example, I've set it to 50% and the battery is always kept at that level while on AC power. This mode prevents battery degradation and is more effective as I usually use my laptop with AC power. I'm looking for a similar program to use with other laptops with Windows OS; preferably a free one.

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  • Software raid 0 with six disks performance

    - by user134880
    I have some problems with disk performance. I have 6 x WD 500Gb RE4 disks. Each disk gives 135Mb/sec throughput. All measurements are made with hdparm with options "-tT" (I know that it is just synthetic test, but I need some start point to make measurements). I have controller with Sil3124 x 4 ports PCI Express 1x So... RAID0 on controller with 2 disks gives 200Mb/s - ok, pcie limit. RAID0 on motherboard with 2 disks gives 270Mb/s - niceeee :) RAID0 on contorller with 4 disks gives 200Mb/s - ok, pcie limit. RAID0 on controller with 4 disks + 1 disks on motherboard = 340Mb/s ... :( RAID0 on controller with 4 disks + 2 disks on motherboard = 300Mb/s .... why? Any ideas? Maybe need more cpu power? Now there is Pentium D Dual core 2.8Ghz, 4Gb RAM. It is dedicated box for storage.. no other activity.

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  • Assembling Software RAID in Live CD for data recovery

    - by Maletor
    I need help recovering some data that's on my RAID which is on a LVM on my server running Ubuntu. What happened was I deleted the logical volume that controlled my swap space which was on a partition on drives sda2, sdb2, sdc2, and sdd2 in RAID1. This foobared my whole system for one reason or another. Booting leave me with grub rescue and an error saying that it is an unknown filesystem. When I boot to a live cd I can see my RAID arrays and I can even start them up. However, it doesn't appear to mount them anywhere so I can't see the data. I am in the live cd now and I have done sudo apt-get install mdadm lvm2 so it should be mounting them correctly. I just can't see why it wouldn't. Please any help is appreciated here. Here is some output. By the way, there are 3 RAIDs, 1) /boot 100mb RAID1, 2) swap 10gb RAID1, 3) root 990GB RAID5 ubuntu@ubuntu:~$ df -h Filesystem Size Used Avail Use% Mounted on aufs 124M 101M 18M 86% / none 2.0G 324K 2.0G 1% /dev /dev/sde1 2.0G 826M 1.2G 42% /cdrom /dev/loop0 667M 667M 0 100% /rofs none 2.0G 164K 2.0G 1% /dev/shm tmpfs 2.0G 28K 2.0G 1% /tmp none 2.0G 92K 2.0G 1% /var/run none 2.0G 0 2.0G 0% /var/lock none 2.0G 0 2.0G 0% /lib/init/rw /dev/md1 91M 73M 15M 84% /media/5ac3dbf1-a6c5-409c-96ae-edc6e27992c7 ubuntu@ubuntu:~$ cat /etc/fstab aufs / aufs rw 0 0 tmpfs /tmp tmpfs nosuid,nodev 0 0 /dev/sda2 swap swap defaults 0 0 /dev/sdb2 swap swap defaults 0 0 /dev/sdc2 swap swap defaults 0 0 /dev/sdd2 swap swap defaults 0 0

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  • Virtualization software for windows 7

    - by user23950
    I've been using Shadow User and Deep freeze for windows xp. But I don't think its compatible with windows 7. Do you know of any application that can achieve the same thing? Please don't tell me to use Returnil virtual system because I've had a really bad experience with it when I'm using xp. The system just restarted over and over. And I have just reformatted by that time.

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  • How does the PPA fit into the scenario of publishing an application to the Ubuntu Software Center?

    - by Mridang Agarwalla
    I've been going through docs for the past couple of hours but I haven't understood what the PPA is? I have a cross-platform Java application that I'd like to publish to the Ubuntu Software Center. My application is open-source and I'm using Github. Apparently, publishing applications to the store isn't as simple as uploading a deb package - am I right? I need to create an account on Launchpad and put all my code there. I don't intend to move from Git to Bzr merely for the sake of publishing to the app store but luckily, one is able to set up source-code mirroring from Github to Launchpad. Since my application is still very premature, it'll have updates fairly often. When I build my application on my machine, do I simply go my Ubuntu App Developer page and upload the new DEB package or do they build my application from source? What exactly is the PPA for? I don't think I'll need too many of the Launchpad features so I'd like to stick to Github if possible. (Publishing for Ubuntu really isn't trivial. I can see why there are so many developers out there who haven't published their applications to the Ubuntu Software Center. Publishing an Android applications has been the easiest so far.)

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  • Differences between software testing processes and techniques?

    - by Aptos
    I get confused between these terms. For examples, should Unit testing be listed as a software testing process or technique? I think unit testing is a software testing technique. And how about Test driven development? Can you give me some examples for software testing processes and techniques? In my opinion, software testing process is a part of the software development life cycle. For example, if we use V-Model, the software testing process will be System test, Acceptance test, Integration Test... Thank you.

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  • Access to the Technology Software

    - by rituchhibber
    The Technology Program software is available to Oracle partners, free of charge, for demonstration and development purposes according to the terms of the OPN Agreement. Instructions for Ordering Software: Download software via the Oracle Software Delivery Cloud website. Downloads are available in most countries. To determine if downloads are available within your country click on the Download software link. Request a physical shipment of the software by downloading and completing the Development and Demonstration Ordering Document (XLS). Should you have additional questions or need assistance in completing the ordering document, please contact your local Partner Business Center. Incomplete orders will not be processed.

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  • How is a "Software Developer" different from a "Software Consultant"? What makes a consultant?

    - by Kumar
    I have seen a lot of people claiming themselves to be a "software consultant". These consultants do what a normal software developer does, write code, estimate tasks, fix bugs and attend meetings etc. The only difference being the financials, consultants end up earning more. Then how is a software developer different from a "consultant"? In addition to the main question, I would like to know how can a software developer become a consultant? Are there any specific guidelines for a consultant? Do they need to amass certifications and write up research papers? Please do not confuse the software consultant with a management consultant. Software consultants I have seen are not managers.

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  • How to create browser based software?

    - by erkant
    I have recently used some software, which come as a regular setup file, where you install your software, and then when you run it, opens the browser, uses the localhost with some specific port number to connect to the software, and runs it from there. I find it quite useful and interesting. But I even don't know whether this kind of software and programming methodology have a name or not. Therefore, I would like to learn which programming languages, APIs, and frameworks are specifically designed for this purpose? One example to this is Metasploit. You can download its setup file, and install it casually like any other software, then when everything finishes, and you want to use the software. It will open the browser and connect to, http://localhost:3790/ where Metasploit will load and start.

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  • Can I use my prepaid phone balance (in pesos) to buy from the Software Centre?

    - by obetus
    Using local network broadband, we can use it to buy games and applications from load balance. Is there any possible ways to use it also in Ubuntu software Center? additional: I'm using mobile broadband for the internet connection,this broadband has a sim card and account number where you can download money from buying a prepaid card worth 100 pesos,300 pesos or 500 pesos, provided by our local network. We use this mobile broadband when there is no wifi connection. There are two kinds of mobile broadband, one is postpaid account and the other is prepaid account. I use prepaid account, this kind of account can load a money for transaction like data plans, from 10 pesos for 30 minutes internet connection or 200 pesos for 5 days internet connection., and this prepaid account can load 5 pesos up to thousands of pesos. Now, if this prepaid mobile broadband can provide money in pesos and has internet connection, I think it can also use it for buying goods or applications or games via internet. i think its only need a software that can detect the sim card number and the money balance for transactions. Sorry for my bad english but I hope you got my point.

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  • Ubuntu Software Centre is gone! How can I get it back?

    - by Mochan
    Right. I am having MAJOR issues. (It would be much appreciated if you would solve them for me! Check my profile for open questions...) Following an answerer... who sorry to say... didn't give a great answer because it was just a graphical way of doing what I had already done - suggested I purge a library. Turns out that library controlled the Advanced Packaging Tool (apt), Ubuntu Software Centre and the repositories. Not a great tool to mess with. While trying to purge the library, it came up with 'Removing MyUnity.. Removing x... Removing x... Removing Ubuntu Software Centre... Removing X... Removing apt..." I quickly recognized and force shut-down my system. But I guess it was too late. So... well, plainly put - how do I get it back?!

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  • How to conciliate OOAD and Database Design?

    - by user1620696
    Recently I've studied about object oriented analysis and design and I liked a lot about it. In every place I've read people say that the idea is to start with the minimum set of requirements and go improving along the way, revisiting this each iteration and making it better as we contiuously develop and contact the customer interested in the software. In particular, one course from Lynda.com said a lot of that: we don't want to spend a lot of time planing everything upfront, we just want to have the minimum to get started and then improve this each iteration. Now, I've also seem a course from the same guy about database design, and there he says differently. He says that although when working with object orientation he likes the agile iterative approach, for database design we should really spend a lot of time planing things upfront instead of just going along the way with the minimum. But this confuses me a little. Indeed, the database will persist important data from our domain model and perhaps configurations of the software and so on. Now, if I'm going to continuously revist the analysis and design of the model, it seems the database design should change also. In the same way, if we plan all the database upfront it seems we are also planing all the model upfront, so the two ideas seems to be incompatible. I really like agile iterative approach, but I'm also looking at getting better design for the database also, so when working with agile iterative approach, how should we deal with the database design?

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