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• Un-balanced network speed although using fiberoptic cable line

  - by Hoàng Long

  I'm not sure this is a right place to ask this question, but there's a strange thing that I don't quite sure what the reason is. My company has hired a fiberoptic cable line for network use (Wifi and cable through a router). But the strange thing is that, whenever someone view YouTube or listen stream music, then network speed for all the others become extremely slow. The download speed for that person is about 4-5 MB/s (or more), but others suffer. I'm still a newbie about networking. But I know there should be a solution. Could anyone tell me a way to stop this bad behavior? It's not possible for asking people not viewing YouTube, since that's part of their jobs. Any insights about this problem would be very welcome.

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• mirroring linux server to external usb harddrive

  - by DuPie

  My google-fu must be sucking. i havent been able to find a good solution for the following: numerous Linux server on commodity hardware Trying to do a recovery mirror copy to external harddrives External harddrives are smaller than source harddrives, but larger than data External drives are connected via usb2 (slow) Servers range from 20GB of data to 400GB of data Servers are remote, so hands on access is a pain need to copy boot files. empty external drives currently Basicly, looking for a way to do use a ghosting solution from INSIDE a running linux server to an external harddrive, without booting a cd etc. the rsync/cpio solutions i've looked at dont work great with grub/dev/proc etc. I understand that since the system isnt offline, it wont be a "mirror" image as files change, but thats ok. Are there any free/commercial products that would work?

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• Hard Drive Fundamentals And Verifying Disk Performance

  - by Agnel Kurian

  Over the past few months, my Windows XP machine has slowed down to a crawl. It takes about 10-15 minutes to go from power-up to reaching a responsive state. I have reasons to believe that this is a result of the hard disk slowing down. Questions: Do hard disks slow down as a result of mechanical wear and tear ...or age? How do I check if my disk has slowed down? Conversely, how can I verify that my disk is indeed running at the speed it's designed to run at? Could drivers be at fault here? Do hard disks come with drivers or does Windows use a generic driver?

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• CPU Affinity on ARM processors

  - by dsljanus

  I am using some RaspberryPI boards for a data acquisition system. They are nice boards, with plenty of community support around them, but they are really slow. I am thinking of gradually replacing them with ODROID multicore boards, with the Samsung Exynos processors. I have some experience using taskset to set CPU affinity on my servers because I am always running Node.js applications that are by definition single threaded. Now, is it possible to do this on an ARM board? I do not see why it would not in theory, but I have doubts over how well it is going to work. Does anyone have experience with this kind of hack? Also, I would appreciate any comments about ARM CPUs and how they differ from x86.

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• XAMPP: Access Forbidden!

  - by Yar

  I just installed a fresh XAMPP on OSX. Apache runs and I can see the splash page. I open the httpd.conf and I set both places that point to htdocs to someplace else, which results in Apache showing an "Access Forbidden!" message. I plugged my directory here: <Directory "/Applications/XAMPP/xamppfiles/htdocs"> and here: DocumentRoot "/Applications/XAMPP/xamppfiles/htdocs" Most files have permissions like -rw-r--r--, but even if I set the index.php using chmod 777 nothing changes. Strangely, I just did this whole thing with MAMP and had no problems serving that directory, but it was slow.

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• Filesystem to quickly get recent modifications

  - by liori

  Hello, I've got relatively big filesystem (ext4) with lots of small files and I'd like to backup it. Making full backups often is not feasible to me so I want to have a way to make differential/incremental backups (differential preferred). But... this is laptop, and scanning for changed files takes lots of time. My questions: 1) Is it possible to get list of files changed since some date from ext4's journal? I know it wasn't designed with this idea in mind, and it might be too small for bigger timespans, but maybe it is somehow possible? 2) Is it possible to monitor filesystem modifications and maintain a list of changed files reliably? I think I could use inotify, but this might be too slow to monitor full filesystem and might be unreliable. (by reliable I mean either I get all modifications since last backup (and this list is not missing anything) or an error message). Laptop runs Debian unstable.

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• Speed up file access on home network

  - by kurasa

  I have 2 PCs (Windows 7 Ultimate) and a Mac running Windows 7 using vmware fusion on my home network tied together using WRN1000 NETGEAR Router On one of the PC's I have a set of file (MYOB .myo). These use a data source to access the data in the files. Operations (reading,writing) to the .myo on the PC which hosts the files is fine but the other 2 it is painfully slow/unreliable and I am wondering what I can do to speed this up. Some ideas I have are 1. Turn off the Windows firewall on all the windows installations on the home network 2. Buy another router. Specifically a router which I can connect a USB flash drive on the back where I can put the .myo files and all the PC can access the files from the USB flash drive on the router (does this speed things up?) Any advice greatly appreciated on how I can speed up this access to data

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• IBM x226 server with Windows 2003 freezing and showing one HDD degraded

  - by Zvonko Telefonko

  We have an IBM x226 server with Windows 2003 running on it. For weeks it's been very slow and it freezes at least once each day. At the boot it show message "degraded" for one HDD and optimal for other HDDs. We have 4 HDDs in it set up in Raid 1. HDD 1 - HDD 2, HDD 3 - HDD4. It seems that HDD2 is the one who is causing problems (showing degraded status). There's an amber led blinking on it together with the green one. We installed ServerRAID manager downloaded from IBM and it gave us option for "rebuild". But the server froze at some point and now it's rebuilding from start again. I've done some Googling and it says that it could be to failing HDD or some cache battery. How can we verify what is the cause of this?

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• What's the fastest way to store/access large files?

  - by philfreo

  I do a lot of video editing on my Mac and need a way to store very large (30 GB) files, and don't have room on my HD. A USB/Firewire external hard drive would work, but it seems way too slow for consistently working with such large files. I've also considered buying another computer, with a large hard drive, and putting it on the same network with a shared folder. What's the fastest / most efficient way to do this? Please consider USB 2.0 speeds, hard drive read times, ethernet speeds, etc. Are there other options I should consider?

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• Varnish and plesk

  - by Raphaël

  I have an e-commerce site with 300,000 products and 20,000 categories. It is slow and currently in production. I decided to install Varnish to speed up. The trouble is that during installation, I got a Guru Meditation. Since the site is in production, I am not allowed to leave this error more than a second, thinking to have made an enormous stupidity. I followed the following tutorial: http://www.euperia.com/linux/setting-up-varnish-with-apache-tutorial I'm sure I followed all without error. I say that there may be a specific configuration with plesk. Has anyone already installed Varnish on a ubuntu 10.04 server with plesk 10? Does anyone have a better resource? I know it is "very vague" as an error, but maybe some of you have had this problem. Sincerely,

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• Good software to record desktop/screen operations [closed]

  - by juanmaflyer

  Possible Duplicate: What is the best software for desktop recording? Hi superuser's. I would like to record some tasks in a program (i want to make a video where i will be explaining how to use a particular program) and i haven't found a good software to do it yet... I have just tested camStudio but when i hit the Record Button the computer starts working very slowly (even when recording in a small area... so i wouldn't imagine how slow it will run if recording full screen). So i want you to recommend me some good software to record the screen on a fast way... Thanks a lot. Juan

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• How do you determine how long it is taking Apache to forward a request to Phusion Passenger?

  - by dan

  I have a Ruby on Rails website that is serving requests relatively fast within Rails. The completion time for a Rails request is about 130ms. But the request still takes a long time because of the time it takes the Apache server in front of the Phusion Passenger instances to hand off the request to Rails. How can I measure how long it takes Apache to hand off the request to Rails via Passenger? And how can I speed this up if it's slow. Yes, I plan on switching to nginx, but I need a temporary fix.

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• Eventlog entry for allowed connection in Windows Firewall

  - by Jaap

  I was seeing a lot of entries in the eventlog: The Windows Filtering Platform has permitted a connection. Application Information: Process ID: 4 Application Name: System Network Information: Direction: Inbound Source Address: 10.xxx.xxx.xxx Source Port: 80 Destination Address: 10.xxx.xxx.xxx Destination Port: 31773 Protocol: 6 Filter Information: Filter Run-Time ID: 67903 Layer Name: Receive/Accept Layer Run-Time ID: 44 We have a loadbalancer which checks every second to see if the application is still running (a health check). The logs contain large amounts of this kind of entries, which makes the Event Viewer slow and it's difficult to find the more interesting logs. How do I make sure these messages don't end up in the event logs?

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• Updating AFP version on Windows Server 2003

  - by Niclas Lindqvist

  Hi, We have a couple of Macs, running Leopard and Snow Leopard in our otherwise pure Windows environment. We cannot get file names longer than 31 characters and some times the file permissions gets scrabbled (users can't delete their own folders or access files they usually access). This only occurs when connecting through AFP, We've tried with SMB but it's horribly slow when working with larger documents, so it's not an option. I somewhere read about AFP 3.0 being the answer. So my question is: Is there some way of updating my "AFP version" on Windows Server 2003, or does anyone have a different idea of what might help to resolve this situation?

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• Is there anything that can be done to make X forwarding over LAN less painful?

  - by Earlz

  I have two *nix machines that I like to remotely do graphical things sometimes with. One of those machines is my Arch Linux media server, and another is my OpenBSD router/general server. My current task was installing a Windows XP over virtual box on my media server. I preferred to do the installation from my main workstation so that I could continue to watch TV from my media server on it's "actual" display. I soon noticed that X forwarding is quite painful though, even over low-latency LAN connections. Are there any settings I can tweak to make it a bit less painfully slow, jittery, and laggy? My LAN is rather small, 100Mbit, and ping times to the other box average at about 0.15ms. Also, I know Virtualbox has a VNC mode it can use instead of doing X forwarding, but this particular task was just an example

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• What hash should be used to ensure file integrity?

  - by Corey Ogburn

  It's no secret that large files offered up for download often are coupled with their MD5 or SHA-1 hash so that after you download you can verify the file's integrity. Are these still the best algorithms to use for this? Obviously these are very popular hashes that potential downloaders would have easy access to. Ignoring that factor, what hashes have the best properties for being used for this? For example, bcrypt would be horrible for this. It's designed to be slow. That would suck to use on your 7.4 GB dual layer OS ISO you just downloaded when a 12 letter password might take up to a second with the right parameters.

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• How to build an outbound load balancer with linux?

  - by matnagel

  We have a small house in the countryside and there is no fixed broadband, so we had a mobile flatrate first, and for 2 people with 2 computers it was too slow, so now we have 2 flatrates for 2 client machines. So I pay 2 flatrates and have double bandwith theoretically. There is a local network in the house that connects everything. But when I am alone I wonder how I can use both connections at the same time. I want to build a solution where I can browse the web and page requests are spread between the 2 connections. I imagine there are expensive routers who can split the traffic between 2 lines. But is there a good way to do it with linux? The solution I am looking for will split the requests already for one page (multiple images, css files, javascrfipt files) between the two lines.

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• is there a way to prespecify to overwrite files with same name?

  - by Celeritas

  Connections to network drives are ridiculously slow (e.g. 15kb/sec on really good days) and when I'm copying files I leave my desk. My problem is when there is a file with the same name to be overwritten, is there a way to specify in advanced to overwrite files? I know it has the option "do same for next x conflicts" but that doesn't popup until (in some cases) a long time after the files start copying. See my dilemma? Example: copying 500 files, estimated time 2 hours, I leave, after 10 minutes message comes up about file with same name and asks if it should overwrite (in this time copying stalls), I come back 30 minutes latter to find only the files in the 10 minutes copied. Out of curiosity how could the network speed be so bad? I asked the boss and he said because it gets routed around a lot and is just bad :(

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• 3 wire computer fan won't run continuously

  - by Ben

  I had an old computer that didn't work anymore, so I took the CPU fan out to see what I could make with it. The fan is NMB model number BG0903-B044-VTL, like this. It has three wires coming off of it, red, black, and white. I know that the white wire is usually a speed sensor. Does this wire need to be connected to something in order for the fan to run continuously? Right now when I apply power to the red and black wires (from a 9-volt battery) the fan will spin very briefly, and then slow down until it stops. The fan's motor only spins in the instant that the power is turned on, but doesn't continue, even though the power is still applied. How can I get the fan to spin continuously?

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• Why is USB-sticks so much slower than Solid State Drives?

  - by Jonas

  From what I understand, USB flash memory and Solid State Drives are based on similar technologies, NAND flash memory. But USB-sticks is usually quite slow with a read and write speed of 5-10MB per second while Solid State Drives usually is very fast, usually 100-570MB per second. Why are Solid State Drives so much faster than USB-sticks? And why isn't USB-sticks faster than 5-10MB per second? Is it simply that SSD-drives uses parallel access to the NAND flash memory or are there other reasons?

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• Best memory-efficient web browser for Ubuntu?

  - by Steve K

  I've installed Ubuntu 10.10 on an old laptop with only 756 MB of RAM, Pentium M 1.6 processor. I'm using Google Chrome 11.0 (dev channel) for web browsing, and it appears to be using up most of my memory and processor time. Does anyone know of a better browser than Chrome on Ubuntu, for an older computer like mine? I'm new to Ubuntu, so there may also be tweaks I can make to my existing system to have it perform better. But right now it's pretty slow when I've got ~5-10 tabs open. Related question: memory-efficient web-browser

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• Is an eee-pc with an Atom N550 dual core OK for Rails 3 development?

  - by dan

  I'm buying an Asus eee-pc 1015PEM and hope to do test-driven Rails 3 development on it. Is the CPU fast enough or too painfully slow for this? I plan on installing Ubuntu. I currently develop on a 11 inch Macbook Air 2010 model. It works fine as a Rails development machine. But for some reason I'm drawn to developing on a cheap little netbook. I don't use any IDE's, and my development workflow is mostly switching between Vim, Gnu Screen, and bash.

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• Password Manager that can sync a Blackberry and Mac OSX.

  - by pdhoven

  I use a Blackberry Bold and a Macbook Pro. I am looking for a solution to have a synchronized password manager between the two devices. All the commercial ones I have discovered won't work between a Blackberry and a Mac. The almost solution was KeePass. I like the application on the Blackberry but I could not get the sync working reliably to the Mac. As well, I had to run the PC application by using Mono on the Mac and it was pretty slow. I am happy to pay for a good solution.

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• I need some MySQL lookup table advice

  - by Gary Beam

  I have a MySQL database with about 200 tables. 50 of these are small 2-field 'id-data' lookup tables. Several of these DB's are hosted on a shared server. I have been informed that I need to reduce the total number of tables in the shared hosting environment because of performance issues relating to too many tables. My question is: Could/Should the 50 2-Field lookup tables be combined into a single 3-field table with 'id-field_name-data' Fields? Even if this can be done, I will have a lot of work to do on the PHP user application. My other choice is moving the DB's to a dedicated server at much higher hosting cost. I don't believe my 200 table DB's are actually causing any performance issues on this shared hosting server, at least not from the user application standpoint. There are never more than 10 of these tables joined in any single query; although I have seen some very-slow queries generated by phpmyadmin on these DB's.

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• PC with 2 RAMs of different frequencies (1GB 533MHz + 2GB 667MHz) showing only 2GB RAM

  - by srinivas

  I have 6 years old PC with 1.25GB (1GB + 256MB) of DDR2 533MHz RAM. As computer has become very slow and memory usage reaching its limits most of the times, i decided to upgrade RAM. But unfortunately, im not finding retailers selling DDR2 533Mhz RAM near my area. Since I was not sure mixing up RAMs of different frequencies, i searched in web. Most results said they can be mixed but computer would run at lower frequency of the 2 RAMs. So I bought 2GB DDR2 667Mhz RAM expecting my pc to have 3GB RAM running at 533 MHz. But computer properties page shows only 2GB RAM. BIOS settings too show the slot with 2GB 667MHz as ACTIVE and other slot with 1GB 533MHz as "NOT INSTALLED". When I removed 2GB RAM, they computer shows only 1GB RAM. So for some reason, 1GB RAM is not getting detected/used. What is the problem here? thanks in advance.

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